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Cheap flights from St. Louis (STL) to Heathrow (LHR) from $344

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/30. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — LHR
Jun 5 — Jun 121
From?
To?
Wed 6/5
Wed 6/12
1 adult, Economy
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The best prices from Lambert-St Louis to London Heathrow are usually found in February or January, booked 64 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from St. Louis to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 31, 2024.

Popular in

June

Cheapest in

February

Round-trip from

$643

One-way from

$491
High demand for flights, 39% potential price rise
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Best time to find cheap flights, 20% potential price drop
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From Lambert-St Louis to London Heathrow
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One-way flight from Lambert-St Louis to London Heathrow
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What is the cheapest day to fly round-trip from St. Louis to London Heathrow Airport?

Flights from St. Louis to London Heathrow Airport are found to be more expensive on Friday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London Heathrow Airport.

How far in advance should I book a flight from St. Louis to London Heathrow Airport?

Find a great deal and save up to 50% by booking at least 10 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to London Heathrow Airport within the next two weeks, with the cheapest ticket starting at $586.

What is the cheapest month to fly from St. Louis to London Heathrow Airport?

Flights from St. Louis to London Heathrow Airport lean towards being more expensive in June. Prices are generally better when you fly from St. Louis to London Heathrow Airport in February, with the cheapest ticket starting at $622.

What is the cheapest time of day to fly from STL to LHR?

One of the essential ways to save on airfare from St. Louis to London Heathrow Airport is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 16% on airfare.

Cheap Air Canada flights from St. Louis to Heathrow

Explore cheap flight options specifically provided by Air Canada for the route between St. Louis and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated May 31, 2024.
Find some of the cheapest Air Canada flights traveling from St. Louis to London. Deals update often to give you more flight options matching your criteria
Wed 9/2510:10 amSTL - LHR
2 stops14h 20mAir Canada
Tue 10/12:05 pmLHR - STL
1 stop13h 00mAir Canada
Deal found 5/30$639
Sun 9/1512:00 pmSTL - LHR
1 stop12h 30mAir Canada
Thu 9/269:30 amLHR - STL
1 stop17h 35mAir Canada
Deal found 5/30$669
Sun 9/1510:10 amSTL - LHR
2 stops14h 20mAir Canada
Thu 9/262:05 pmLHR - STL
1 stop13h 00mAir Canada
Deal found 5/30$674
Tue 9/1010:10 amSTL - LHR
2 stops17h 50mAir Canada
Tue 9/179:30 amLHR - STL
1 stop17h 35mAir Canada
Deal found 5/29$683
Thu 10/174:05 pmSTL - LHR
1 stop13h 45mAir Canada
Tue 10/229:30 amLHR - STL
1 stop17h 35mAir Canada
Deal found 5/30$689
Wed 9/1810:10 amSTL - LHR
1 stop14h 25mAir Canada
Tue 9/248:30 amLHR - STL
2 stops18h 35mAir Canada
Deal found 5/30$695
Fri 9/64:05 pmSTL - LHR
1 stop13h 45mAir Canada
Sat 9/148:30 amLHR - STL
1 stop12h 50mAir Canada
Deal found 5/31$780
Tue 7/94:05 pmSTL - LHR
1 stop13h 45mAir Canada
Thu 7/188:30 amLHR - STL
1 stop12h 51mAir Canada
Deal found 5/30$785
Wed 8/712:00 pmSTL - LHR
1 stop12h 30mAir Canada
Tue 8/1312:40 pmLHR - STL
2 stops14h 25mAir Canada
Deal found 5/30$789

Cheap American Airlines flights from St. Louis to Heathrow

Explore cheap flight options specifically provided by American Airlines for the route between St. Louis and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated May 31, 2024.
Take a gander at the lowest prices we've found on American Airlines flights from St. Louis to London. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Wed 9/46:10 pmSTL - LHR
1 stop12h 05mAmerican Airlines
Wed 9/189:15 amLHR - STL
1 stop16h 15mAmerican Airlines
Deal found 5/30$682
Fri 7/263:18 pmSTL - LHR
1 stop11h 47mAmerican Airlines
Thu 8/2912:15 pmLHR - STL
1 stop17h 08mAmerican Airlines
Deal found 5/30$730
Mon 7/153:18 pmSTL - LHR
1 stop14h 52mAmerican Airlines
Thu 7/259:35 amLHR - STL
1 stop14h 46mAmerican Airlines
Deal found 5/30$787
Thu 7/47:00 amSTL - LHR
1 stop20h 05mAmerican Airlines
Tue 7/169:15 amLHR - STL
1 stop13h 41mAmerican Airlines
Deal found 5/29$835
Fri 7/193:18 pmSTL - LHR
1 stop11h 47mAmerican Airlines
Sat 7/2710:05 amLHR - STL
1 stop13h 14mAmerican Airlines
Deal found 5/30$875
Thu 6/66:00 amSTL - LHR
1 stop10h 10mAmerican Airlines
Sun 6/912:15 pmLHR - STL
1 stop13h 14mAmerican Airlines
Deal found 5/30$884
Thu 6/66:11 amSTL - LHR
1 stop19h 19mAmerican Airlines
Thu 6/139:15 amLHR - STL
1 stop16h 14mAmerican Airlines
Deal found 5/30$1,037
Fri 6/76:08 pmSTL - LHR
1 stop10h 12mAmerican Airlines
Wed 7/319:45 amLHR - STL
1 stop12h 27mAmerican Airlines
Deal found 5/31$1,177
Fri 6/75:38 pmSTL - LHR
1 stop32h 02mAmerican Airlines
Sun 6/239:35 amLHR - STL
1 stop14h 39mAmerican Airlines
Deal found 5/30$1,203

Cheap St. Louis to Heathrow flights in May & June 2024

Find cheap flight options from St. Louis to Heathrow specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,784,634 searches. Prices were last updated on May 31, 2024.
Scroll through some of the best deals on flights from St. Louis to London in 2024. Check back soon for alternative fares.
Wed 6/56:15 amSTL - LHR
1 stop19h 25mUnited Airlines
Wed 6/126:55 amLHR - STL
2 stops19h 30mUnited Airlines
Deal found 5/30$774
Wed 6/511:15 amSTL - LHR
1 stop14h 25mMultiple Airlines
Wed 6/129:30 amLHR - STL
1 stop17h 35mMultiple Airlines
Deal found 5/30$778
Wed 6/59:05 amSTL - LHR
1 stop18h 35mUnited Airlines
Wed 6/126:50 amLHR - STL
2 stops20h 54mUnited Airlines
Deal found 5/31$779
Wed 6/127:15 amSTL - LHR
1 stop17h 10mDelta
Wed 6/196:15 amLHR - STL
2 stops16h 46mDelta
Deal found 5/31$780
Wed 6/1211:25 amSTL - LHR
2 stops16h 50mDelta
Wed 6/1911:30 amLHR - STL
2 stops18h 13mDelta
Deal found 5/31$785
Tue 6/411:38 amSTL - LHR
2 stops12h 57mUnited Airlines
Tue 6/119:30 amLHR - STL
2 stops31h 27mUnited Airlines
Deal found 5/30$787
Wed 6/1211:25 amSTL - LHR
1 stop13h 20mKLM
Wed 6/193:55 pmLHR - STL
1 stop13h 48mKLM
Deal found 5/31$788
Sat 6/84:45 pmSTL - LHR
1 stop34h 55mUnited Airlines
Wed 6/199:30 amLHR - STL
1 stop12h 28mUnited Airlines
Deal found 5/30$795
Tue 6/116:15 amSTL - LHR
1 stop19h 25mUnited Airlines
Wed 6/198:30 amLHR - STL
1 stop11h 44mUnited Airlines
Deal found 5/30$803

St. Louis to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated May 31, 2024.
Scroll through some of the best deals on flights from St. Louis to London in 2024. Check back soon for alternative fares.
Wed 9/256:02 amSTL - LHR
2 stops18h 28mUnited Airlines
Tue 10/82:05 pmLHR - STL
2 stops30h 43mUnited Airlines
Deal found 5/31$626
Wed 9/256:15 amSTL - LHR
1 stop23h 20mMultiple Airlines
Tue 10/86:00 pmLHR - STL
1 stop27h 20mMultiple Airlines
Deal found 5/31$632
Tue 10/16:15 amSTL - LHR
1 stop23h 20mMultiple Airlines
Tue 10/86:00 pmLHR - STL
1 stop27h 20mMultiple Airlines
Deal found 5/30$633
Wed 9/2512:00 pmSTL - LHR
1 stop16h 00mUnited Airlines
Tue 10/89:30 amLHR - STL
1 stop17h 35mUnited Airlines
Deal found 5/30$634
Wed 9/256:02 amSTL - LHR
2 stops18h 28mUnited Airlines
Tue 10/82:05 pmLHR - STL
1 stop13h 00mUnited Airlines
Deal found 5/31$638
Wed 9/2510:10 amSTL - LHR
2 stops14h 20mAir Canada
Tue 10/12:05 pmLHR - STL
1 stop13h 00mAir Canada
Deal found 5/30$639
Wed 10/911:51 amSTL - LHR
1 stop12h 34mDelta
Wed 10/236:15 amLHR - STL
2 stops16h 36mDelta
Deal found 5/31$641
Wed 9/256:00 amSTL - LHR
1 stop18h 25mDelta
Tue 10/19:55 amLHR - STL
2 stops16h 36mDelta
Deal found 5/31$643
Wed 10/910:00 amSTL - LHR
2 stops24h 00mMultiple Airlines
Wed 10/236:40 amLHR - STL
2 stops22h 55mMultiple Airlines
Deal found 5/31$644

St. Louis to Heathrow flights leaving soon

Find last-minute flight options from St. Louis to Heathrow for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated May 31, 2024.
Have a look at some of the last-minute flights available departing from St. Louis to London. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Wed 6/56:15 amSTL - LHR
1 stop19h 25mUnited Airlines
Wed 6/126:55 amLHR - STL
2 stops19h 30mUnited Airlines
Deal found 5/30$774
Wed 6/511:15 amSTL - LHR
1 stop14h 25mMultiple Airlines
Wed 6/129:30 amLHR - STL
1 stop17h 35mMultiple Airlines
Deal found 5/30$778
Wed 6/59:05 amSTL - LHR
1 stop18h 35mUnited Airlines
Wed 6/126:50 amLHR - STL
2 stops20h 54mUnited Airlines
Deal found 5/31$779
Sat 6/84:45 pmSTL - LHR
1 stop34h 55mUnited Airlines
Wed 6/199:30 amLHR - STL
1 stop12h 28mUnited Airlines
Deal found 5/30$795
Wed 6/511:15 amSTL - LHR
1 stop14h 25mUnited Airlines
Tue 6/181:40 pmLHR - STL
1 stop14h 35mUnited Airlines
Deal found 5/30$803
Thu 6/64:55 pmSTL - LHR
1 stop32h 45mUnited Airlines
Thu 6/139:30 amLHR - STL
1 stop17h 35mUnited Airlines
Deal found 5/30$823
Wed 6/511:15 amSTL - LHR
1 stop14h 25mUnited Airlines
Sun 6/96:50 amLHR - STL
2 stops14h 51mUnited Airlines
Deal found 5/30$829
Sat 6/87:15 amSTL - LHR
1 stop17h 10mDelta
Wed 6/196:15 amLHR - STL
2 stops16h 46mDelta
Deal found 5/31$830
Sat 6/811:25 amSTL - LHR
2 stops16h 50mDelta
Wed 6/1911:30 amLHR - STL
2 stops18h 13mDelta
Deal found 5/31$835

One-way flights to Heathrow from St. Louis

Search for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated May 31, 2024.
Users in need of a one-way flight from St. Louis to London can choose from these deals. Users needing a return flight from St. Louis to London should utilize the search form above.
Tue 7/3010:11 amSTL - LHR
3 stops28h 09mMultiple Airlines
Deal found 5/30$344
Tue 7/1610:11 amSTL - LHR
3 stops19h 44mMultiple Airlines
Deal found 5/30$357
Wed 7/1712:15 pmSTL - LHR
3 stops17h 40mMultiple Airlines
Deal found 5/30$394
Tue 8/1310:11 amSTL - LHR
3 stops19h 44mMultiple Airlines
Deal found 5/31$411
Sun 8/116:15 pmSTL - LHR
3 stops35h 40mMultiple Airlines
Deal found 5/31$417
Wed 7/3112:15 pmSTL - LHR
3 stops26h 05mMultiple Airlines
Deal found 5/30$419
Mon 8/1212:15 pmSTL - LHR
3 stops26h 05mMultiple Airlines
Deal found 5/31$420
Thu 8/112:15 pmSTL - LHR
3 stops26h 05mMultiple Airlines
Deal found 5/30$468
Fri 8/912:15 pmSTL - LHR
3 stops17h 40mMultiple Airlines
Deal found 5/31$476

Find flights from St. Louis to Heathrow within your budget

Customize your flight search to find flights from St. Louis to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated May 31, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$626 - $806

Route

Depart

Return

Price

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/25

2 stops18h 28m

London Heathrow

Tue 10/8

2 stops30h 43m

$626

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/25

1 stop23h 20m

London Heathrow

Tue 10/8

1 stop27h 20m

$632

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/25

2 stops14h 20m

London Heathrow

Tue 10/1

1 stop13h 00m

$639

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/9

1 stop12h 34m

London Heathrow

Wed 10/23

2 stops16h 36m

$641

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/25

2 stops13h 55m

London Heathrow

Tue 10/8

2 stops15h 14m

$652

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/4

1 stop12h 05m

London Heathrow

Wed 9/18

1 stop16h 15m

$682

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/18

1 stop14h 25m

London Heathrow

Tue 9/24

2 stops19h 43m

$703

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/13

1 stop12h 46m

London Heathrow

Mon 8/19

2 stops31h 24m

$734

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Sun 7/7

1 stop10h 11m

London Heathrow

Fri 8/9

1 stop13h 32m

$806

Flights are sorted by cheapest first

Deals found on 5/31

What is the cheapest day to fly from St. Louis to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Heathrow. Price data was last updated on May 26, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their St. Louis to London Heathrow Airport flight should consider departing on Wednesday evenings when fares are most often at their lowest. Thursday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from St. Louis to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature and rainfall totals by month.

LON

Temperature

39.2 - 62.6 °F

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated May 31, 2024.
Get a feel of what it's like to fly with Air Canada, American Airlines and United Airlines from St. Louis to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
10,419 reviews
Check prices

Crew

8.6

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Overall

8.0

Food

7.4

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta
8.0
Very good
10,419 reviews
Delta
8.0
Very good
10,419 reviews
Check prices

Crew

8.6

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Overall

8.0

Food

7.4

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

KLM
7.9
Good
1,516 reviews
Delta
8.0
Very good
10,419 reviews
Check prices

Crew

8.6

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Overall

8.0

Food

7.4

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Finnair
7.8
Good
1,369 reviews
Delta
8.0
Very good
10,419 reviews
Check prices

Crew

8.6

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Overall

8.0

Food

7.4

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Austrian Airlines
7.7
Good
1,019 reviews
Delta
8.0
Very good
10,419 reviews
Check prices

Crew

8.6

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Overall

8.0

Food

7.4

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Virgin Atlantic
7.6
Good
720 reviews
Delta
8.0
Very good
10,419 reviews
Check prices

Crew

8.6

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Overall

8.0

Food

7.4

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to London Heathrow?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to London Heathrow from St. Louis. Booking flights from Lambert-St Louis (STL) to London Heathrow should be relatively easy as there are 0 daily outbound flights to London Heathrow from 11 different airlines.

  • Can I find flights from St. Louis to London Heathrow Airport for under $700 on Cheapflights?

    Yes, there are multiple flights from St. Louis to London Heathrow Airport for under $700. The cheapest flight booked recently is on United Airlines for just $626, but on average you can expect to pay $657.

  • Are there last-minute flights available from St. Louis to London Heathrow Airport for under $800?

    There are currently 20+ open flights from St. Louis to London Heathrow Airport within the next 7 days for less than $800.

  • What are the cheapest airlines flying from St. Louis to London Heathrow Airport round-trip?

    According to our current data, United Airlines ($626), Air Canada ($639), and Delta ($641) offers the cheapest pricing from St. Louis to London Heathrow Airport. United Airlines is 29% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from St. Louis to London Heathrow Airport one-way?

    For one-way options, check prices for Austrian Airlines. According to our data, you can fly for as low as $491. Users have also found prices from $495 and $500 on Iberia and American Airlines, respectively.

  • What does STL to LHR mean?

    This is defined as Lambert-St Louis Airport (STL) and London Heathrow Airport (LHR). Codes like London Heathrow Airport are often used to just call airports uniquely.

  • Can I find deals for flights from St. Louis to Heathrow that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Heathrow flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from St. Louis to Heathrow with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Heathrow flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from St. Louis to Heathrow that include hotel bookings?

    Yes. In addition to deals on St. Louis to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Heathrow.

  • Can I find deals for business class flights from St. Louis to Heathrow?

    Yes. Cheapflights offers flight deals from St. Louis to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from St. Louis to Heathrow that allow pets onboard?

    Many airlines flying from St. Louis to Heathrow offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from St. Louis to Heathrow?

    Yes, you can often find last-minute deals on St. Louis to Heathrow flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the St. Louis to London Heathrow Airport flight deals updated?

    The St. Louis to London Heathrow Airport flight deals you see on this page were last updated on 5/31.

  • What are the most popular airlines that fly from St. Louis to London Heathrow Airport?

    The most popular airlines flying from St. Louis to London Heathrow Airport are American Airlines, Air Canada and Air France. Something to consider prior to booking your flight.

  • What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $652). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,114). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.

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Kansas City to Gatwick flights
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Top 10 airlines flying from St. Louis to Heathrow

Discover the top 10 airlines that operate flights from St. Louis to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated May 31, 2024.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$587Average$845FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest$620Average$781FlexibilityNo cancel feeOn-time77%
Search Iberia flights
FinnairCheapest$643Average$840FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest$653Average$881FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest$654Average$795FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest$661Average$868FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$666Average$1,047FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
LufthansaCheapest$670Average$1,259FlexibilityNo cancel feeOn-time76%
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KLMCheapest$688Average$885FlexibilityNo cancel feeOn-time75%
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