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Cheap flights from Ontario (ONT) to Illinois from $62

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 6/24. 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.
ONT — ORD
juni 3 — juni 101
From?
To?
man. 6/3
man. 6/10
1 adult, Economy
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How far in advance should I book a flight from Ontario to Illinois?

To save up to 71% on this flight, we recommend booking at least 60 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ontario to Illinois from $319 1-2 weeks out and tickets from $507 for flights departing within the next 72 hours.

What is the cheapest month to fly from Ontario to Illinois?

Our data shows that January tends to be the cheapest month to fly to Illinois from Ontario. Users have commonly found prices around $313 for the month, but tickets can be as low as $135. Due to multiple factors, prepare for potentially higher prices in March.

When is the cheapest time to fly from Ontario to Illinois (ONT - IL)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Illinois as you normally would.

Cheap Delta flights from Ontario to Illinois

Explore cheap flight options specifically provided by Delta for the route between Ontario and Illinois. 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 2,696,634 searches. Data last updated maj 29, 2024.
Check out some of the cheapest Delta flights we've come across from Ontario to Illinois. Come back soon if you're not finding the exact deal you're looking for.
tir. 6/117:05 amONT - ORD
2 stops11h 53mDelta
tir. 6/186:55 amORD - ONT
1 stop8h 31mDelta
Deal found 5/27$241
fre. 5/311:20 pmONT - ORD
1 stop6h 12mDelta
tir. 6/47:30 pmORD - ONT
1 stop6h 13mDelta
Deal found 5/28$279
lør. 6/16:42 pmONT - ORD
2 stops11h 57mDelta
lør. 6/87:20 pmORD - ONT
1 stop6h 22mDelta
Deal found 5/27$284
man. 7/152:04 pmONT - ORD
1 stop7h 52mDelta
fre. 7/267:35 amORD - ONT
1 stop6h 40mDelta
Deal found 5/27$287
fre. 6/76:30 pmONT - ORD
2 stops12h 51mDelta
lør. 6/81:25 pmORD - ONT
2 stops11h 35mDelta
Deal found 5/28$289
tor. 8/15:00 pmONT - ORD
2 stops12h 30mDelta
man. 8/55:15 pmORD - ONT
2 stops8h 44mDelta
Deal found 5/28$297
tor. 7/41:25 pmONT - ORD
1 stop6h 19mDelta
ons. 7/109:39 amORD - ONT
2 stops16h 20mDelta
Deal found 5/28$318
fre. 5/311:20 pmONT - ORD
1 stop6h 12mDelta
lør. 6/17:45 amORD - ONT
1 stop6h 28mDelta
Deal found 5/28$322
fre. 5/311:20 pmONT - ORD
1 stop6h 12mDelta
man. 6/35:44 pmORD - ONT
2 stops7h 59mDelta
Deal found 5/28$327

Cheap Frontier flights from Ontario to Illinois

Explore cheap flight options specifically provided by Frontier for the route between Ontario and Illinois. 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 2,696,634 searches. Data last updated maj 29, 2024.
Take a gander at the lowest prices we've found on Frontier flights from Ontario to Illinois. Deals are refreshing constantly so come back soon for more options.
fre. 9/612:49 amONT - ORD
1 stop21h 22mFrontier
lør. 9/217:30 pmORD - ONT
1 stop13h 38mFrontier
Deal found 5/28$136
lør. 9/148:35 pmONT - ORD
1 stop6h 12mFrontier
lør. 9/217:30 pmORD - ONT
1 stop13h 38mFrontier
Deal found 5/28$137
tir. 6/42:25 pmONT - ORD
1 stop28h 23mFrontier
tir. 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$138
tir. 8/2012:49 amONT - ORD
1 stop22h 14mFrontier
tir. 8/277:30 pmORD - ONT
1 stop24h 39mFrontier
Deal found 5/28$139
fre. 6/712:48 amONT - ORD
1 stop18h 18mFrontier
tor. 6/138:23 pmORD - ONT
1 stop23h 05mFrontier
Deal found 5/28$140
fre. 6/712:48 amONT - ORD
1 stop18h 18mFrontier
man. 6/109:43 pmORD - ONT
1 stop28h 16mFrontier
Deal found 5/28$141
tir. 6/115:26 pmONT - ORD
1 stop9h 59mFrontier
tor. 6/138:23 pmORD - ONT
1 stop23h 05mFrontier
Deal found 5/28$143
tor. 6/67:33 pmONT - STL
2 stops24h 26mFrontier
tir. 6/117:29 pmSTL - ONT
1 stop24h 19mFrontier
Deal found 5/29$145
fre. 8/1612:49 amONT - ORD
1 stop21h 22mFrontier
lør. 8/247:30 pmORD - ONT
1 stop15h 36mFrontier
Deal found 5/28$146

Cheap Ontario to Illinois flights in May & June 2024

Find cheap flight options from Ontario to Illinois specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,696,634 searches. Prices were last updated on maj 29, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in May and June 2024. Check back regularly for other flight deals.
fre. 5/3112:59 amONT - STL
1 stop6h 26mFrontier
lør. 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/28$137
tir. 6/42:25 pmONT - ORD
1 stop28h 23mFrontier
tir. 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$138
tir. 6/412:59 amONT - STL
1 stop6h 30mFrontier
man. 6/108:22 pmSTL - ONT
1 stop5h 37mFrontier
Deal found 5/28$139
ons. 6/512:49 amONT - ORD
1 stop21h 51mFrontier
tir. 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$139
man. 6/312:59 amONT - BMI
1 stop13h 02mFrontier
tir. 6/115:13 pmBMI - ONT
1 stop8h 46mFrontier
Deal found 5/28$139
ons. 6/58:03 amONT - STL
1 stop28h 29mFrontier
man. 6/108:22 pmSTL - ONT
1 stop5h 37mFrontier
Deal found 5/28$140
ons. 6/512:49 amONT - ORD
1 stop21h 51mFrontier
man. 6/109:43 pmORD - ONT
1 stop28h 16mFrontier
Deal found 5/28$140
fre. 5/3112:59 amONT - STL
1 stop6h 26mFrontier
ons. 6/58:02 pmSTL - ONT
1 stop16h 57mFrontier
Deal found 5/27$141
fre. 6/712:48 amONT - ORD
1 stop18h 18mFrontier
ons. 6/129:53 pmORD - ONT
1 stop28h 06mFrontier
Deal found 5/29$141

Ontario to Illinois 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,696,634 searches. Data last updated maj 29, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in May and June 2024. Check back regularly for other flight deals.
fre. 9/612:49 amONT - MDW
1 stop9h 03mFrontier
lør. 9/2110:00 pmMDW - ONT
1 stop11h 08mFrontier
Deal found 5/28$136
fre. 9/612:49 amONT - ORD
1 stop21h 22mFrontier
lør. 9/217:30 pmORD - ONT
1 stop13h 38mFrontier
Deal found 5/28$136
fre. 5/3112:59 amONT - STL
1 stop6h 26mFrontier
lør. 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/28$137
lør. 9/148:35 pmONT - ORD
1 stop6h 12mFrontier
lør. 9/217:30 pmORD - ONT
1 stop13h 38mFrontier
Deal found 5/28$137
tir. 6/42:25 pmONT - ORD
1 stop28h 23mFrontier
tir. 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$138
tir. 6/412:59 amONT - STL
1 stop6h 30mFrontier
man. 6/108:22 pmSTL - ONT
1 stop5h 37mFrontier
Deal found 5/28$139
ons. 8/2812:30 pmONT - MDW
1 stop16h 03mFrontier
tir. 9/310:00 pmMDW - ONT
1 stop13h 06mFrontier
Deal found 5/28$139
tir. 8/2012:49 amONT - ORD
1 stop22h 14mFrontier
tir. 8/277:30 pmORD - ONT
1 stop24h 39mFrontier
Deal found 5/28$139
man. 6/312:59 amONT - BMI
1 stop13h 02mFrontier
tir. 6/115:13 pmBMI - ONT
1 stop8h 46mFrontier
Deal found 5/28$139

Ontario to Illinois flights leaving soon

Find last-minute flight options from Ontario to Illinois 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 2,696,634 searches. Data last updated maj 29, 2024.
Users seeking a last-minute flight from Ontario to Illinois should consider booking one of these fares. It's wise to confirm all flight details are correct before booking.
tir. 6/42:25 pmONT - ORD
1 stop28h 23mFrontier
tir. 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$138
tir. 6/412:59 amONT - STL
1 stop6h 30mFrontier
man. 6/108:22 pmSTL - ONT
1 stop5h 37mFrontier
Deal found 5/28$139
ons. 6/512:49 amONT - ORD
1 stop21h 51mFrontier
tir. 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$139
man. 6/312:59 amONT - BMI
1 stop13h 02mFrontier
tir. 6/115:13 pmBMI - ONT
1 stop8h 46mFrontier
Deal found 5/28$139
ons. 6/58:03 amONT - STL
1 stop28h 29mFrontier
man. 6/108:22 pmSTL - ONT
1 stop5h 37mFrontier
Deal found 5/28$140
ons. 6/512:49 amONT - ORD
1 stop21h 51mFrontier
man. 6/109:43 pmORD - ONT
1 stop28h 16mFrontier
Deal found 5/28$140
fre. 6/712:48 amONT - ORD
1 stop18h 18mFrontier
man. 6/109:43 pmORD - ONT
1 stop28h 16mFrontier
Deal found 5/28$141
fre. 6/710:23 pmONT - STL
1 stop9h 06mFrontier
søn. 6/97:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 5/28$143
tir. 6/115:26 pmONT - ORD
1 stop9h 59mFrontier
tor. 6/138:23 pmORD - ONT
1 stop23h 05mFrontier
Deal found 5/28$143

One-way flights to Illinois from Ontario

Search for one-way flight options from Ontario to Illinois. 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 2,696,634 searches. Data last updated maj 29, 2024.
Take a look at some of the one-way flights we've detected from Ontario to Illinois. For those needing a return trip from Ontario, there is a search form available above.
man. 6/2412:49 amONT - ORD
1 stop21h 51mFrontier
Deal found 5/28$62
ons. 6/128:41 pmONT - MDW
1 stop6h 48mFrontier
Deal found 5/28$70
tir. 6/48:29 pmONT - ORD
1 stop6h 31mFrontier
Deal found 5/28$70
tir. 6/48:29 pmONT - MDW
1 stop6h 11mFrontier
Deal found 5/28$71
fre. 8/2312:49 amONT - STL
1 stop6h 48mFrontier
Deal found 5/28$74
tir. 6/48:29 pmONT - ORD
1 stop6h 31mFrontier
Deal found 5/28$74
fre. 8/3012:49 amONT - STL
1 stop6h 48mFrontier
Deal found 5/26$75
ons. 6/1212:49 amONT - STL
1 stop11h 43mFrontier
Deal found 5/27$76
fre. 8/2312:49 amONT - MDW
1 stop9h 03mFrontier
Deal found 5/28$76

Find flights from Ontario to Illinois within your budget

Customize your flight search to find flights from Ontario to Illinois 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 2,696,634 searches. Data last updated maj 29, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$136 - $351

Route

Depart

Return

Price

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

fre. 9/6

1 stop21h 22m

Chicago O'Hare Intl

lør. 9/21

1 stop13h 38m

$136

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

lør. 9/14

1 stop6h 12m

Chicago O'Hare Intl

lør. 9/21

1 stop13h 38m

$137

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

tir. 8/20

1 stop22h 14m

Chicago O'Hare Intl

tir. 8/27

1 stop24h 39m

$139

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

tir. 8/20

1 stop6h 48m

Lambert-St Louis

lør. 8/24

1 stop5h 44m

$140

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

fre. 6/7

1 stop18h 18m

Chicago O'Hare Intl

tor. 6/13

1 stop23h 05m

$140

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

tir. 8/20

1 stop6h 48m

Lambert-St Louis

lør. 8/24

1 stop13h 39m

$141

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

tir. 6/11

2 stops11h 53m

Chicago O'Hare Intl

tir. 6/18

1 stop8h 31m

$241

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

fre. 6/14

1 stop9h 03m

Chicago O'Hare Intl

søn. 6/16

1 stop5h 42m

$260

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

lør. 7/20

1 stop9h 09m

Lambert-St Louis

ons. 7/24

2 stops15h 40m

$351

Flights are sorted by cheapest first

Deals found on 5/28

No data available for this route at this time. Please check back soon.

Best time to book a flight from Ontario to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ontario 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.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated maj 29, 2024.
Get a feel of what it's like to fly with Delta, Frontier and American Airlines from Ontario to Illinois by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Alaska Airlines
8.1
Very good
9,194 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Delta
8.0
Very good
10,476 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

WestJet
7.5
Good
2,871 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Avianca
7.5
Good
3,661 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

United Airlines
7.4
Good
10,784 reviews
Alaska Airlines
8.1
Very good
9,194 reviews
Check prices

Overall

8.1

Food

7.3

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Illinois. 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 Ontario to Illinois?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Illinois.

  • Can I find flights from Ontario to Illinois for under $200 on Cheapflights?

    Yes, there are multiple flights from Ontario to Illinois for under $200. The cheapest flight booked recently is on Frontier for just $136, but on average you can expect to pay $147.

  • Are there last-minute flights available from Ontario to Illinois for under $200?

    There are currently 20+ open flights from Ontario to Illinois within the next 7 days for less than $200.

  • What are the most popular routes from Ontario to Illinois?

    The most popular flight routes from Ontario to Illinois are Ontario - Chicago O'Hare Intl, Ontario - Chicago Midway and Ontario - Lambert-St Louis.

  • What does ONT to ORD mean?

    ONT and ORD are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. ONT to ORD refers to a flight route from Ontario Airport to Chicago O'Hare Intl Airport. Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI) are other airports near this flight route and their unique identifiers/IATA codes.

  • Can I find deals for flights from Ontario to Illinois that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to Illinois 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 Ontario to Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Illinois 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 Ontario to Illinois that include hotel bookings?

    Yes. In addition to deals on Ontario to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Illinois?

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

  • Can I find deals for business class flights from Ontario to Illinois?

    Yes. Cheapflights offers flight deals from Ontario to Illinois 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 Ontario to Illinois that allow pets onboard?

    Many airlines flying from Ontario to Illinois 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 Ontario to Illinois?

    Yes, you can often find last-minute deals on Ontario to Illinois 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 Ontario to Illinois flight deals updated?

    The Ontario to Illinois flight deals you see on this page were last updated on 5/28.

  • What are the most popular airlines that fly from Ontario to Illinois?

    Consider American Airlines, Delta or Frontier when booking your flight. These represent the most popular airlines when flying from Ontario to Illinois.

  • When is the best time to book a flight from Ontario to Illinois?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Illinois (average of $244). Flying from Ontario to Illinois in June is currently the most expensive (average of $326). 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

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Alternative routes for Ontario to Illinois
See prices for flight routes from nearby airports that may be better suited for you.

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Top 5 airlines flying from Ontario to Illinois

Discover the top 5 airlines that operate flights from Ontario to Illinois. 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 2,696,634 searches. Data last updated maj 29, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$105Average$257FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$123Average$227FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapest$276Average$412FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$292Average$618FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$299Average$520FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
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Newark Airport to Fort Lauderdale flights
Los Angeles to Dubai flights
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Houston to Paris flights
Ontario to Indiana flights

Search flights from Ontario to Illinois by cabin class

Find flights from Ontario to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from Ontario to Illinois

Find hourly flight availability from Ontario to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated maj 29, 2024.
26%of flight departuresEarly morningMidnight to 6 am
62%of flight departuresMorning6 am to noon
12%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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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 Ontario to Illinois?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Illinois. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Illinois?

Millions of users choose and trust Cheapflights to book the best flight deals from Ontario to Illinois for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Ontario to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ontario to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ontario to Illinois become cheaper?

Not ready to book yet? You can track prices for flights from Ontario to Illinois on Cheapflights with our Price Alert feature and get notified when better prices are available.

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