Cheap flights from St. Louis to Ontario (STL - ONT) from $56
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 6/3. 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.
The best prices from Lambert-St Louis to Ontario are usually found in April or August, booked 38 days in advance, depart on a Thursday or Monday and return on a Saturday
Cheap flight deals from St. Louis to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Ontario (ONT). 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 15, 2024.
Popular in | June |
|---|---|
Cheapest in | April |
Round-trip from | $238 |
One-way from | $181 |
What is the cheapest day to fly round-trip from St. Louis to Ontario?
Thursday flights are generally found to be more expensive for flights from St. Louis to Ontario. 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 Ontario.
How far in advance should I book a flight from St. Louis to Ontario?
Travelers have found it’s best to book a flight 37 days in advance to save up to 105% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 37 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from St. Louis to Ontario 1-2 weeks in advance for as low as $589, or $654 for flights within the next 24 hours.
What is the cheapest month to fly from St. Louis to Ontario?
Our data shows that April tends to be the cheapest month to fly to Ontario from St. Louis. Users have commonly found prices around $413 for the month, but tickets can be as low as $185. Due to multiple factors, prepare for potentially higher prices in March.
When is the cheapest time to fly from St. Louis to Ontario (STL - ONT)?
It’s optimal to fly from St. Louis to Ontario in the evening. By choosing this option you can save up to 58% on the cost of your flight, compared to a flight at noon.
Cheap Delta flights from St. Louis to Ontario
Explore cheap flight options specifically provided by Delta for the route between St. Louis and Ontario. 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 2,632,958 searches. Data last updated May 15, 2024.
Consider these cheap Delta flights we've found departing from St. Louis to Ontario. Make sure to double check the flight details before booking.
Cheap American Airlines flights from St. Louis to Ontario
Explore cheap flight options specifically provided by American Airlines for the route between St. Louis and Ontario. 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 2,632,958 searches. Data last updated May 15, 2024.
Have a look at some of the cheapest available American Airlines flights departing from St. Louis and landing in Ontario. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Cheap St. Louis to Ontario flights in May & June 2024
Find cheap flight options from St. Louis to Ontario specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,632,958 searches. Prices were last updated on May 15, 2024.
Scroll through some of the best deals on flights from St. Louis to Ontario in 2024. For more flight deals, be sure to check back very soon.
St. Louis to Ontario 2024 flight deals
Discover exclusive flight deals for travel between St. Louis and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,632,958 searches. Data last updated May 15, 2024.
Scroll through some of the best deals on flights from St. Louis to Ontario in 2024. For more flight deals, be sure to check back very soon.
St. Louis to Ontario flights leaving soon
Find last-minute flight options from St. Louis to Ontario 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 2,632,958 searches. Data last updated May 15, 2024.
Have a look at some of the last-minute flights available departing from St. Louis to Ontario. It's wise to confirm all flight details are correct before booking.
One-way flights to Ontario from St. Louis
Search for one-way flight options from St. Louis to Ontario. 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 2,632,958 searches. Data last updated May 15, 2024.
Users in need of a one-way flight from St. Louis to Ontario can choose from these deals. Users in need of a round-trip flight from St. Louis to Ontario instead should update the search form at the top of page.
Find flights from St. Louis to Ontario within your budget
Customize your flight search to find flights from St. Louis to Ontario 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 2,632,958 searches. Data last updated May 15, 2024.
Fly from
Fly to
Budget
$126 - $399
Route
Depart
Return
Price
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Mon 6/3
1 stop5h 55m
Ontario
Tue 6/4
1 stop6h 30m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Mon 6/3
1 stop5h 55m
Ontario
Tue 6/4
1 stop6h 30m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Fri 6/7
1 stop5h 47m
Ontario
Sun 6/9
2 stops22h 19m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Tue 5/28
1 stop24h 43m
Ontario
Fri 6/7
1 stop11h 52m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Wed 9/4
1 stop13h 39m
Ontario
Tue 9/10
1 stop6h 48m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Thu 5/30
1 stop18h 23m
Ontario
Tue 6/4
1 stop6h 30m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Tue 8/13
1 stop7h 10m
Ontario
Tue 8/13
1 stop7h 53m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Wed 5/29
1 stop12h 19m
Ontario
Tue 6/18
2 stops14h 30m
Lambert-St LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Mon 8/12
2 stops8h 53m
Ontario
Thu 8/15
1 stop8h 51m
When is the best time to book a flight from St. Louis to Ontario?
Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Ontario. Price data was last updated on May 10, 2024.
The price you pay for your flight from St. Louis to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 37 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
When is the cheapest time to fly from St. Louis to Ontario?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Ontario. Price data was last updated on May 12, 2024.
Average price of flights to Ontario by month
Plan your trip from St. Louis to Ontario by taking into account the cheapest months to travel. The average price of a one-way flight from St. Louis to Ontario is currently $74 while a round-trip flight costs $216. Price data was last updated on May 12, 2024.
Currently, October is the cheapest month in which you can book a flight from St. Louis to Ontario (average of $238). Flying from St. Louis to Ontario in July is currently the most expensive (average of $338). 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.
January
$268
February
$287
March
$281
April
$256
May
$268
June
$330
July
$338
August
$287
September
$258
October
$238
November
$268
December
$272
Temperature and rainfall in Ontario by month
Plan your trip to Ontario by taking into account the average temperature and rainfall totals by month.
LAX Temperature | 57.2 - 73.4 °F |
|---|
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated May 15, 2024.
Peruse reviews from past customers who have flown with Delta, American Airlines and Frontier from St. Louis to Ontario to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
We paid $161 for two exit row seats thinking there’d be extra leg room and not be cramped! The price we paid was a rip-off for these seats and the plane was extremely narrow and cramped. The male crew were okay but not super-friendly. When we picked up our luggage at baggage claim, someone ripped my luggage with a knife or blunt object and destroyed it!! I will be filling a claim for this and took pictures. I heard great reviews about this airline but am disappointed.
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes for St. Louis to OntarioSee prices for flight routes from nearby airports that may be better suited for you.
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from St. Louis to Ontario
Discover the top 4 airlines that operate flights from St. Louis to Ontario. 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 2,632,958 searches. Data last updated May 15, 2024.
Search flights from St. Louis to Ontario by cabin class
Find flights from St. Louis to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Hourly flight availability from St. Louis to Ontario
Find hourly flight availability from St. Louis to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 15, 2024.
| 0%of flight departures | Early morningMidnight to 6 am |
|---|---|
| 0%of flight departures | Morning6 am to noon |
| 0%of flight departures | AfternoonNoon to 6 pm |
| 100%of flight departures | Evening6 pm to midnight |
Book a flight to one of these trending destinations
User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Fly with Cheapflights
Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from St. Louis to Ontario?
When you search for this flight from St. Louis to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
Why should you use Cheapflights to find cheap flight tickets from St. Louis to Ontario?
Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from St. Louis to Ontario for you. Better yet — we are completely free to use.
Can Cheapflights find flights from St. Louis to Ontario with no change fees?
Certainly. Search results for flights to Ontario from St. Louis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.
Can Cheapflights notify me if prices for flights from St. Louis to Ontario become cheaper?
Yes! Start tracking prices for St. Louis to Ontario flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.