$408 Cheap Flights from Champaign (CMI) to Ontario (ONT)

View $408 flight on Fri, Dec 12, 2025Opens in a new window

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

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Cheap Flights from Champaign to Ontario (CMI-ONT)

Prices were available within the past 7 days and start at $408 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
Fri, Nov 14 - Sat, Nov 15
CMI
Champaign
ONT
Ontario
$464 Roundtrip, found 17 hours ago
$464
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Fri, Nov 14 from Champaign to Ontario, returning Sat, Nov 15, priced at $464 found 17 hours ago
American Airlines
Sat, Oct 18 - Sat, Oct 25
CMI
Champaign
ONT
Ontario
$466 Roundtrip, found 6 days ago
$466
Roundtrip
found 6 days ago
Select American Airlines flight, departing Sat, Oct 18 from Champaign to Ontario, returning Sat, Oct 25, priced at $466 found 6 days ago
American Airlines
Fri, Nov 14 - Mon, Nov 24
CMI
Champaign
ONT
Ontario
$494 Roundtrip, found 1 day ago
$494
Roundtrip
found 1 day ago
Select American Airlines flight, departing Fri, Nov 14 from Champaign to Ontario, returning Mon, Nov 24, priced at $494 found 1 day ago
American Airlines
Wed, Jan 7 - Mon, Jan 12
CMI
Champaign
ONT
Ontario
$497 Roundtrip, found 1 day ago
$497
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Jan 7 from Champaign to Ontario, returning Mon, Jan 12, priced at $497 found 1 day ago
American Airlines
Wed, Nov 19 - Wed, Dec 3
CMI
Champaign
ONT
Ontario
$524 Roundtrip, found 1 hour ago
$524
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Wed, Nov 19 from Champaign to Ontario, returning Wed, Dec 3, priced at $524 found 1 hour ago
American Airlines
Sat, Oct 18 - Sat, Oct 25
CMI
Champaign
ONT
Ontario
$529 Roundtrip, found 6 days ago
$529
Roundtrip
found 6 days ago
Select American Airlines flight, departing Sat, Oct 18 from Champaign to Ontario, returning Sat, Oct 25, priced at $529 found 6 days ago
American Airlines
Sat, Nov 1 - Sat, Nov 15
CMI
Champaign
ONT
Ontario
$540 Roundtrip, found 12 hours ago
$540
Roundtrip
found 12 hours ago
Select American Airlines flight, departing Sat, Nov 1 from Champaign to Ontario, returning Sat, Nov 15, priced at $540 found 12 hours ago
American Airlines
Sat, Jan 10 - Sat, Jan 17
CMI
Champaign
ONT
Ontario
$546 Roundtrip, found 1 day ago
$546
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Jan 10 from Champaign to Ontario, returning Sat, Jan 17, priced at $546 found 1 day ago
American Airlines
Fri, Nov 14 - Mon, Nov 24
CMI
Champaign
ONT
Ontario
$546 Roundtrip, found 1 day ago
$546
Roundtrip
found 1 day ago
Select American Airlines flight, departing Fri, Nov 14 from Champaign to Ontario, returning Mon, Nov 24, priced at $546 found 1 day ago
American Airlines
Wed, Nov 19 - Thu, Nov 27
CMI
Champaign
ONT
Ontario
$554 Roundtrip, found 1 hour ago
$554
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Wed, Nov 19 from Champaign to Ontario, returning Thu, Nov 27, priced at $554 found 1 hour ago

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Average driving time to city center is 42 minutes. Flights from $622
SNA
John Wayne
Average driving time to city center42 min
Flights from $622

Frequently asked questions

How much does a flight from University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Grab a cheap one-way flight from $408 or cheap return flight from $464 from University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT)?
Traveling in November can help you save, as it's the cheapest month for flights between CMI and ONT. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest CMI to ONT flight.
How many flights per day from University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT)?
Direct flights from University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from CMI to ONT?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can vary based on various factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT)?
To avoid potential delays on the University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT) route, travel before 3 PM. Departures after this hour are 22% more likely to be canceled.**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 University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Last-minute bookings from CMI to ONT are generally more expensive. To secure the lowest rates, start searching for flights well in advance. That being said, if you're flexible with your travel dates, you may land a cheap ticket just before your departure.
Is it cheaper to book a CMI to ONT flight and hotel package?
You'll generally save money by securing a CMI to ONT flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After choosing your preferred accommodations and flights, consider adding extras such as tours, activities and car rentals.
Can I cancel or change the date of my flight from University Of Illinois Urbana-Champaign Williard Airport (CMI) to Los Angeles - Ontario Intl. Airport (ONT)?
Generally, it's possible to reschedule or cancel your CMI to ONT flight. However, if the booking was made more than 24 hours ago, additional charges 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 details on our Customer Service portal.

Travel information

Origin airport
University Of Illinois Urbana-Champaign Williard
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines
Roundtrip price
$464
Distance
1660 mi

Book with confidence

Champaign to Ontario Flights

The cheapest times to fly from Champaign to Ontario

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 Champaign to Ontario are during the month of November. You can find some of the cheapest flights from Champaign to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Champaign to Ontario

Sunday is one of the best days to book for cheap flights from Champaign to Ontario: 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 Champaign to Ontario

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 Champaign to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $408 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 Champaign to Ontario 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 Champaign to Ontario 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.

 

Champaign to Ontario Flights

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*Available to One Key members.