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Cheap flights from Ontario (ONT) to Illinois from $63

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 5/17. 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
May 9 — May 161
From?
To?
Thu 5/9
Thu 5/16
1 adult, Economy
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How far in advance should I book a flight from Ontario to Illinois?

To save up to 79% on this flight, we recommend booking at least 46 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 $297 1-2 weeks out and tickets from $499 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 $302 for the month, but tickets can be as low as $93. Due to multiple factors, prepare for potentially higher prices in June.

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 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 2,864,334 searches. Data last updated May 4, 2024.
Check out some of the cheapest Frontier flights we've come across from Ontario to Illinois. Come back soon if you're not finding the exact deal you're looking for.
Sat 5/185:41 pmONT - ORD
1 stop9h 19mFrontier
Tue 5/218:00 amORD - ONT
1 stop17h 59mFrontier
Deal found 5/3$117
Wed 5/2911:30 pmONT - STL
1 stop8h 43mFrontier
Fri 6/75:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/3$119
Sun 5/2611:30 pmONT - STL
1 stop8h 43mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/3$125
Sat 5/1810:10 pmONT - MDW
1 stop5h 40mFrontier
Sat 5/259:05 pmMDW - ONT
1 stop12h 24mFrontier
Deal found 5/4$126
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Mon 5/208:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/3$128
Tue 5/146:55 pmONT - MDW
1 stop14h 41mFrontier
Wed 8/2111:32 amMDW - ONT
1 stop6h 26mFrontier
Deal found 5/3$136
Fri 5/3112:59 amONT - ORD
1 stop21h 19mFrontier
Sat 6/88:35 pmORD - ONT
1 stop16h 21mFrontier
Deal found 5/2$137
Wed 5/222:35 pmONT - ORD
1 stop8h 38mFrontier
Tue 5/287:59 pmORD - ONT
1 stop15h 05mFrontier
Deal found 5/3$138
Sat 5/185:41 pmONT - ORD
1 stop9h 19mFrontier
Tue 5/287:59 pmORD - ONT
1 stop15h 05mFrontier
Deal found 5/3$139

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 2,864,334 searches. Data last updated May 4, 2024.
Take a gander at the lowest prices we've found on Delta flights from Ontario to Illinois. Deals are refreshing constantly so come back soon for more options.
Sat 5/181:20 pmONT - ORD
1 stop6h 38mDelta
Sat 5/255:15 pmORD - ONT
1 stop6h 24mDelta
Deal found 5/4$279
Fri 5/3110:00 pmONT - ORD
2 stops8h 59mDelta
Sat 6/15:15 pmORD - ONT
1 stop6h 24mDelta
Deal found 5/2$284
Fri 5/1010:00 pmONT - ORD
1 stop8h 20mDelta
Fri 5/177:30 pmORD - ONT
1 stop6h 13mDelta
Deal found 5/3$322
Fri 5/1010:00 pmONT - ORD
2 stops8h 59mDelta
Fri 5/177:30 pmORD - ONT
1 stop6h 13mDelta
Deal found 5/3$327
Thu 5/96:42 pmONT - ORD
2 stops11h 57mDelta
Mon 5/131:32 pmORD - ONT
2 stops11h 15mDelta
Deal found 5/3$332
Wed 6/55:45 amONT - STL
1 stop5h 47mDelta
Tue 6/117:55 amSTL - ONT
1 stop6h 22mDelta
Deal found 5/3$354
Sat 5/251:20 pmONT - STL
1 stop6h 04mDelta
Fri 5/315:02 pmSTL - ONT
1 stop7h 45mDelta
Deal found 5/3$374
Tue 9/2412:45 pmONT - BMI
1 stop7h 45mDelta
Sat 9/286:00 amBMI - ONT
1 stop7h 22mDelta
Deal found 5/3$386
Thu 5/96:42 pmONT - ORD
2 stops11h 57mDelta
Fri 5/107:30 pmORD - ONT
1 stop6h 13mDelta
Deal found 5/3$405

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 2,864,334 searches. Prices were last updated on May 4, 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.
Sat 5/185:41 pmONT - MDW
1 stop10h 09mFrontier
Tue 5/212:45 pmMDW - ONT
1 stop11h 14mFrontier
Deal found 5/3$117
Sat 5/185:41 pmONT - ORD
1 stop9h 19mFrontier
Tue 5/218:00 amORD - ONT
1 stop17h 59mFrontier
Deal found 5/3$117
Wed 5/2911:30 pmONT - STL
1 stop8h 43mFrontier
Fri 6/75:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/3$119
Sun 5/2611:30 pmONT - STL
1 stop8h 43mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/3$125
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Mon 5/208:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/3$128
Mon 5/1312:59 amONT - MDW
1 stop19h 06mFrontier
Wed 8/2111:32 amMDW - ONT
1 stop6h 26mFrontier
Deal found 5/3$136
Sat 5/2510:10 pmONT - STL
1 stop10h 03mFrontier
Fri 5/318:45 pmSTL - ONT
1 stop12h 54mFrontier
Deal found 5/3$137
Fri 5/3112:59 amONT - MDW
1 stop18h 07mFrontier
Sat 6/85:40 amMDW - ONT
1 stop20h 17mFrontier
Deal found 5/2$137
Fri 5/3112:59 amONT - ORD
1 stop21h 19mFrontier
Sat 6/88:35 pmORD - ONT
1 stop16h 21mFrontier
Deal found 5/2$137

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 2,864,334 searches. Data last updated May 4, 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.
Sat 5/185:41 pmONT - MDW
1 stop10h 09mFrontier
Tue 5/212:45 pmMDW - ONT
1 stop11h 14mFrontier
Deal found 5/3$117
Sat 5/185:41 pmONT - ORD
1 stop9h 19mFrontier
Tue 5/218:00 amORD - ONT
1 stop17h 59mFrontier
Deal found 5/3$117
Wed 5/2911:30 pmONT - STL
1 stop8h 43mFrontier
Fri 6/75:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/3$119
Sun 5/2611:30 pmONT - STL
1 stop8h 43mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/3$125
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Mon 5/208:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/3$128
Mon 5/1312:59 amONT - MDW
1 stop19h 06mFrontier
Wed 8/2111:32 amMDW - ONT
1 stop6h 26mFrontier
Deal found 5/3$136
Sat 5/2510:10 pmONT - STL
1 stop10h 03mFrontier
Fri 5/318:45 pmSTL - ONT
1 stop12h 54mFrontier
Deal found 5/3$137
Fri 5/3112:59 amONT - MDW
1 stop18h 07mFrontier
Sat 6/85:40 amMDW - ONT
1 stop20h 17mFrontier
Deal found 5/2$137
Fri 5/3112:59 amONT - ORD
1 stop21h 19mFrontier
Sat 6/88:35 pmORD - ONT
1 stop16h 21mFrontier
Deal found 5/2$137

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 2,864,334 searches. Data last updated May 4, 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.
Mon 5/1312:59 amONT - MDW
1 stop19h 06mFrontier
Wed 8/2111:32 amMDW - ONT
1 stop6h 26mFrontier
Deal found 5/3$136
Mon 5/1312:59 amONT - MDW
1 stop8h 39mFrontier
Wed 6/55:55 amMDW - ONT
1 stop19h 54mFrontier
Deal found 5/3$138
Fri 5/1010:59 pmONT - STL
1 stop9h 19mFrontier
Tue 5/1410:59 pmSTL - ONT
1 stop10h 09mFrontier
Deal found 5/3$139
Tue 5/1412:59 amONT - MDW
1 stop8h 39mFrontier
Tue 5/216:00 amMDW - ONT
1 stop19h 59mFrontier
Deal found 5/3$139
Fri 5/1010:29 pmONT - STL
1 stop11h 10mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 5/3$140
Mon 5/1312:59 amONT - MDW
1 stop8h 39mFrontier
Tue 5/212:45 pmMDW - ONT
1 stop11h 14mFrontier
Deal found 5/3$140
Sat 5/1112:59 amONT - STL
1 stop11h 30mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop25h 00mFrontier
Deal found 5/3$141
Fri 5/1012:55 amONT - ORD
1 stop22h 01mFrontier
Sat 5/187:59 pmORD - ONT
1 stop13h 30mFrontier
Deal found 5/3$142
Fri 5/1012:55 amONT - MDW
1 stop17h 44mFrontier
Sat 5/189:05 pmMDW - ONT
1 stop12h 24mFrontier
Deal found 5/3$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 2,864,334 searches. Data last updated May 4, 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.
Fri 5/1712:59 amONT - MDW
1 stop8h 14mFrontier
Deal found 5/3$63
Wed 5/222:35 pmONT - ORD
1 stop8h 38mFrontier
Deal found 5/4$63
Sat 5/185:41 pmONT - ORD
1 stop9h 19mFrontier
Deal found 5/3$65
Tue 6/412:59 amONT - MDW
1 stop9h 01mFrontier
Deal found 5/4$66
Tue 8/2712:49 amONT - MDW
1 stop9h 03mFrontier
Deal found 5/4$68
Wed 5/297:45 pmONT - ORD
1 stop7h 15mFrontier
Deal found 5/3$68
Tue 5/212:25 pmONT - MDW
1 stop18h 44mFrontier
Deal found 5/4$69
Tue 6/412:59 amONT - STL
1 stop6h 30mFrontier
Deal found 5/3$70
Wed 5/157:36 pmONT - MDW
1 stop8h 14mFrontier
Deal found 5/4$70

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 2,864,334 searches. Data last updated May 4, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$117 - $359

Route

Depart

Return

Price

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Sat 5/18

1 stop10h 09m

Chicago Midway

Tue 5/21

1 stop11h 14m

$117

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Sat 5/18

1 stop9h 19m

Chicago O'Hare Intl

Tue 5/21

1 stop17h 59m

$117

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Wed 5/29

1 stop8h 43m

Lambert-St Louis

Fri 6/7

1 stop5h 47m

$119

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Sun 5/26

1 stop8h 43m

Lambert-St Louis

Mon 6/3

1 stop5h 55m

$125

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Sat 5/18

1 stop5h 40m

Chicago Midway

Sat 5/25

1 stop12h 24m

$126

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 5/17

1 stop9h 09m

Lambert-St Louis

Mon 5/20

1 stop5h 55m

$128

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Sat 5/18

1 stop6h 38m

Chicago O'Hare Intl

Sat 5/25

1 stop6h 24m

$279

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Thu 5/23

1 stop8h 00m

Chicago O'Hare Intl

Sun 5/26

1 stop10h 13m

$288

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Tue 5/28

1 stop11h 44m

Lambert-St Louis

Sat 6/1

2 stops11h 31m

$359

Flights are sorted by cheapest first

Deals found on 5/3

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

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 May 4, 2024.
Get a feel of what it's like to fly with Frontier, Delta 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.
Southwest
8.2
Very good
6,099 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Southwest
8.2
Very good
6,099 reviews
Southwest
8.2
Very good
6,099 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Alaska Airlines
8.1
Very good
9,137 reviews
Southwest
8.2
Very good
6,099 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Delta
8.1
Very good
10,838 reviews
Southwest
8.2
Very good
6,099 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

United Airlines
7.4
Good
11,125 reviews
Southwest
8.2
Very good
6,099 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

American Airlines
7.3
Good
14,728 reviews
Southwest
8.2
Very good
6,099 reviews
Check prices

Comfort

8.1

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

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 $117, but on average you can expect to pay $133.

  • 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 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.

  • 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 5/3.

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 2,864,334 searches. Data last updated May 4, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$105Average$261FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$122Average$234FlexibilityNo cancel feeOn-time62%
Search Frontier flights
United AirlinesCheapest$244Average$517FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapest$276Average$459FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$296Average$624FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Boston to Cancún flights
Dallas to San Antonio flights
Reno to Las Vegas flights
Houston to Boston flights
San Francisco to Las Vegas flights
Newark Airport to Fort Lauderdale flights
Los Angeles to Dubai flights
USA to Hyderabad flights
Boston to Phoenix flights
Phoenix to Las Vegas flights
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 May 4, 2024.
0%of flight departuresEarly morningMidnight to 6 am
100%of flight departuresMorning6 am to noon
0%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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