$302 Cheap Flights from Ontario (ONT) to Champaign (CMI)

View $302 flight on Wed, Sep 24, 2025Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Champaign, IL (CMI-University Of Illinois Urbana-Champaign Williard)

Cheap Flights from Ontario to Champaign (ONT-CMI)

Prices were available within the past 7 days and start at $302 for one-way flights and $464 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, May 6 - Thu, May 28
ONT
Ontario
CMI
Champaign
$464 Roundtrip, found 2 days ago
$464
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, May 6 from Ontario to Champaign, returning Thu, May 28, priced at $464 found 2 days ago
American Airlines
Sat, Sep 27 - Sat, Oct 4
ONT
Ontario
CMI
Champaign
$466 Roundtrip, found 2 hours ago
$466
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, Sep 27 from Ontario to Champaign, returning Sat, Oct 4, priced at $466 found 2 hours ago
American Airlines
Fri, Oct 31 - Mon, Nov 3
ONT
Ontario
CMI
Champaign
$491 Roundtrip, found 5 hours ago
$491
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Fri, Oct 31 from Ontario to Champaign, returning Mon, Nov 3, priced at $491 found 5 hours ago
American Airlines
Thu, Nov 13 - Mon, Nov 17
ONT
Ontario
CMI
Champaign
$494 Roundtrip, found 4 hours ago
$494
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Thu, Nov 13 from Ontario to Champaign, returning Mon, Nov 17, priced at $494 found 4 hours ago
American Airlines
Wed, May 6 - Thu, May 28
ONT
Ontario
CMI
Champaign
$497 Roundtrip, found 2 days ago
$497
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, May 6 from Ontario to Champaign, returning Thu, May 28, priced at $497 found 2 days ago
American Airlines
Sat, Sep 27 - Fri, Oct 3
ONT
Ontario
CMI
Champaign
$513 Roundtrip, found 2 hours ago
$513
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, Sep 27 from Ontario to Champaign, returning Fri, Oct 3, priced at $513 found 2 hours ago
American Airlines
Fri, Oct 31 - Mon, Nov 3
ONT
Ontario
CMI
Champaign
$516 Roundtrip, found 5 hours ago
$516
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Fri, Oct 31 from Ontario to Champaign, returning Mon, Nov 3, priced at $516 found 5 hours ago
American Airlines
Mon, Nov 17 - Sun, Nov 23
ONT
Ontario
CMI
Champaign
$521 Roundtrip, found 3 hours ago
$521
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Mon, Nov 17 from Ontario to Champaign, returning Sun, Nov 23, priced at $521 found 3 hours ago
American Airlines
Tue, Nov 4 - Sat, Nov 15
ONT
Ontario
CMI
Champaign
$524 Roundtrip, found 10 hours ago
$524
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Tue, Nov 4 from Ontario to Champaign, returning Sat, Nov 15, priced at $524 found 10 hours ago
American Airlines
Wed, Oct 1 - Wed, Oct 8
ONT
Ontario
CMI
Champaign
$535 Roundtrip, found 7 hours ago
$535
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Wed, Oct 1 from Ontario to Champaign, returning Wed, Oct 8, priced at $535 found 7 hours ago
Flights from Ontario (ONT) to Champaign (CMI)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
University Of Illinois Urbana-Champaign Williard
Airlines serving
American Airlines
Roundtrip price
$464
Distance
1660 mi

Ontario to Champaign Flights

The cheapest times to fly from Ontario to Champaign

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario to Champaign are during the month of May. You can find some of the cheapest flights from Ontario to Champaign with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario to Champaign

Sunday is one of the best days to book for cheap flights from Ontario to Champaign: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Ontario to Champaign

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario to Champaign in 2025. You can also book with separate airlines for your outbound and return journeys, from $302 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario to Champaign flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario to Champaign airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI) cost?
Lock in a cheap one-way flight from $302 or cheap return flight from $464 from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
May is the most affordable month to fly from ONT to CMI. Planning your trip for the off-season is often the key to finding better deals on flights.
What is the cheapest airline that flies from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest ONT to CMI flight.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
You'll have to take a flight with a layover when traveling from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI). Direct flights don't operate daily on this route. However, simply filter your search to include one or more stops to discover an option that works for you.
What day of the week has the most flights from ONT to CMI?
Usually you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* However, this can vary based on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
To avoid potential delays on the Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI) route, aim to travel before 3 PM. Flights after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI) last-minute?
Holding off until just before your trip to book a flight from ONT to CMI often results in higher prices. Although you may find some last-minute offers, they aren't always guaranteed. Keep your travel plans flexible for a better chance of getting a bargain.
Is it cheaper to book an ONT to CMI flight and hotel package?
Opting for an ONT to CMI flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Pick from our impressive range of stays and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to University Of Illinois Urbana-Champaign Williard Airport (CMI)?
Typically, it's possible to reschedule or cancel your ONT to CMI flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.