HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$464+ Cheap flights from Champaign to Ontario (CMI - ONT)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/27. Fares are subject to change and may not be available on all flights or dates of travel.
CMI — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Champaign to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Champaign to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Champaign (CMI) 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 September 15, 2025.

Round-trip from

$464
(American Airlines)

Popular in

September

Cheapest in

April

Average price

$694
From Champaign University-Willard to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($65 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Champaign to Ontario

Cheapest flights from Champaign to Ontario
Explore the most affordable flight options available from Champaign to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:45 amCMI - ONT
1 stop6h 51mAmerican Airlines
Thu 12/412:46 pmONT - CMI
1 stop5h 44mAmerican Airlines
Deal found 9/14$464
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/243:15 pmCMI - ONT
1 stop9h 24mAmerican Airlines
Sat 12/612:46 pmONT - CMI
1 stop5h 41mAmerican Airlines
Deal found 9/14$524
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:00 amCMI - ONT
2 stops11h 24mAmerican Airlines
Wed 12/39:59 amONT - CMI
2 stops8h 28mAmerican Airlines
Deal found 9/14$535
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/243:15 pmCMI - ONT
1 stop9h 24mAmerican Airlines
Thu 12/46:00 amONT - CMI
1 stop6h 45mAmerican Airlines
Deal found 9/14$554
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/243:15 pmCMI - ONT
1 stop9h 24mAmerican Airlines
Fri 12/59:59 amONT - CMI
2 stops7h 39mAmerican Airlines
Deal found 9/14$560
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:00 amCMI - ONT
2 stops11h 24mAmerican Airlines
Fri 12/59:59 amONT - CMI
2 stops9h 31mAmerican Airlines
Deal found 9/14$565
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/243:15 pmCMI - ONT
1 stop9h 24mAmerican Airlines
Tue 12/24:47 pmONT - CMI
2 stops21h 15mAmerican Airlines
Deal found 9/14$574
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:00 amCMI - ONT
2 stops11h 24mAmerican Airlines
Tue 12/24:47 pmONT - CMI
2 stops21h 15mAmerican Airlines
Deal found 9/14$579

Cheapflights Fare Finder

 
Customize your flight search to find flights from Champaign 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 2,558,603 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from Champaign to Ontario that are best for you.

Fly from

Champaign

Fly to

Ontario

Route

Depart

Return

Price

ChampaignOntario

CMI - ONT

CMIONT

Champaign University-Willard

Thu 11/27

6:45 am-11:53 am

1 stop7h 08m

Ontario

Thu 12/4

12:46 pm-8:30 pm

1 stop5h 44m

$465

ChampaignOntario

CMI - ONT

CMIONT

Champaign University-Willard

Thu 11/27

6:45 am-11:36 am

1 stop6h 51m

Ontario

Wed 12/3

12:46 pm-8:27 pm

1 stop5h 41m

$524

ChampaignOntario

CMI - ONT

CMIONT

Champaign University-Willard

Thu 11/27

6:45 am-11:36 am

1 stop6h 51m

Ontario

Fri 12/5

12:46 pm-8:27 pm

1 stop5h 41m

$554

ChampaignOntario

CMI - ONT

CMIONT

Champaign University-Willard

Thu 11/27

6:45 am-11:36 am

1 stop6h 51m

Ontario

Sun 12/7

9:59 am-7:38 pm

2 stops7h 39m

$587

ChampaignOntario

CMI - ONT

CMIONT

Champaign University-Willard

Mon 11/24

6:45 am-4:01 pm

2 stops11h 16m

Ontario

Wed 12/3

9:59 am-8:27 pm

2 stops8h 28m

$592

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Best time to book a flight from Champaign to Ontario

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

Cheapflights Insights

Everything you need to know about your flight from Champaign to Ontario

What is the cheapest month to book a flight from Champaign to Ontario?

Currently, August is the cheapest month in which you can book a flight from Champaign to Ontario (average of $246). Flying from Champaign to Ontario in March is currently the most expensive (average of $328). 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.

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 September 15, 2025.
See what other customers who have flown with American Airlines from Champaign to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
10,000 reviews

Overall

7.2

Food

6.4

Boarding

7.5

Comfort

7.2

Entertainment

6.9

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Diana,Jul 2024

ORD - IND

Shout out to Isabelle and Debbie who went above and beyond to make it a good experience. Wheelchair service and workers were excellent and much appreciated.
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Overall

7.2

Food

6.4

Boarding

7.5

Comfort

7.2

Entertainment

6.9

Crew

8.0

Reviews

1 / 20
8.0
Excellent

Diana,Jul 2024

ORD - IND

Shout out to Isabelle and Debbie who went above and beyond to make it a good experience. Wheelchair service and workers were excellent and much appreciated.

Related info for your journey

Find useful and relevant information for your journey from Champaign to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Champaign to Ontario?

    A quick flight from Champaign to Ontario can take about 7h 08m. American Airlines provides one of the quickest options available for as low as $465. There are 1659 mi between Champaign and Ontario.

  • What is the cheapest airline to fly from Champaign to Ontario round-trip?

    Flying on American Airlines is currently your cheapest option to Ontario, with prices starting at $464.

  • Can I find deals for flights from Champaign to Ontario that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Champaign to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Champaign to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Champaign to Ontario (average of $246). Flying from Champaign to Ontario in March is currently the most expensive (average of $328). 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

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 Champaign to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Las Vegas flights
O'Hare Intl to Los Angeles flights
O'Hare Intl to San Francisco flights
Midway to Las Vegas flights
O'Hare Intl to Santa Ana flights
O'Hare Intl to San Diego flights
O'Hare Intl to Ontario flights
St. Louis to Las Vegas flights
Midway to Los Angeles flights
O'Hare Intl to Palm Springs flights
Midway to San Francisco flights
O'Hare Intl to Burbank flights
O'Hare Intl to Sacramento flights
O'Hare Intl to San Jose flights
St. Louis to Los Angeles flights
Midway to San Diego flights
St. Louis to San Francisco flights
O'Hare Intl to Oakland flights
O'Hare Intl to Reno flights
Rockford to Las Vegas flights
Midway to Santa Ana flights
Midway to Ontario flights
O'Hare Intl to Fresno flights
Midway to Palm Springs flights
St. Louis to San Diego flights
Midway to San Jose flights
O'Hare Intl to Santa Barbara flights
St. Louis to Ontario flights
Midway to Oakland flights
Midway to Burbank flights
Moline to Las Vegas flights
Midway to Sacramento flights
St. Louis to Santa Ana flights
Peoria to Las Vegas flights
St. Louis to Palm Springs flights
O'Hare Intl to Long Beach flights
St. Louis to San Jose flights
St. Louis to Sacramento flights
O'Hare Intl to Monterey flights
Bloomington to Las Vegas flights
St. Louis to Long Beach flights
O'Hare Intl to San Luis Obispo flights
Midway to Reno flights
Midway to Long Beach flights
St. Louis to Burbank flights
Midway to Fresno flights
Evansville to Las Vegas flights
Peoria to San Francisco flights
Moline to San Diego flights
Moline to San Jose flights

Top airline flying from Champaign to Ontario

Discover the top airline that operate flights from Champaign 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 2,558,603 searches. Data last updated September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$464Average$733FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.