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$358+ Cheap flights from Champaign to Ontario (CMI - ONT)

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 6/4. Fares are subject to change and may not be available on all flights or dates of travel.
CMI — ONT
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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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 April 17, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$513
(American Airlines)

One-way from

$358
(American Airlines)

Popular in

December

Cheapest in

November

Average price

$462
Provider with most accurate pricing for Champaign University-Willard-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Champaign University-Willard-Los Angeles flights.
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From Champaign University-Willard to Ontario
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One-way flight from Champaign University-Willard to Ontario
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High demand for flights, 3% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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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 April 17, 2025.

This American Airlines deal was found by Cheapflights users on 4/17. 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.
Sun 4/277:00 amCMI - ONT
1 stop6h 45mAmerican Airlines
Sat 5/32:44 pmONT - CMI
1 stop5h 39mAmerican Airlines
Deal found 4/17$513

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 April 17, 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

Sun 4/27

7:00 am-11:45 am

1 stop6h 45m

Ontario

Sat 5/3

2:44 pm-10:23 pm

1 stop5h 39m

$513

ChampaignOntario

CMI - ONT

CMIONT

Champaign University-Willard

Wed 6/4

6:46 am-1:52 pm

1 stop9h 06m

$358

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 April 17, 2025.
American Airlines
7.2
Good
10,000 reviews

Food

6.5

Comfort

7.2

Entertainment

6.9

Boarding

7.5

Overall

7.2

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

Food

6.5

Comfort

7.2

Entertainment

6.9

Boarding

7.5

Overall

7.2

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.

  • 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 $513.

  • 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

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Alternative routes for Champaign to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$296Average$649FlexibilityNo cancel feeOn-time71%

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