Cheap Flights from Chicago to Ontario from £34️ (CHI-ONT)

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Latest Flight Deals from Chicago to Ontario

Book one-way or return flights from Chicago to Ontario from as little as £34. Choose from the popular airlines below and book your flight today!

One way
Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Searching for the best last minute flight from Chicago to Ontario? Find one-way or return flights that are affordable and fit your itinerary.

Trip.com monitors the ticket fares of flights from Chicago to Ontario. Stay updated on price trends and snag the best deals for your upcoming trip.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Airlines Flying from Chicago to Ontario

View airlines operating flights from Chicago to Ontario. Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines

From £34

Spirit Airlines

From £49

Sun Country Airlines

From £68

American Airlines

From £70

Alaska Airlines

From £80

Allegiant Air

From £84

Delta Air Lines

From £84

United Airlines

From £89

Southwest Airlines

From £102

Jetblue Airways

From £254

ANA airlines

Find more flights and airlines

Alternative Routes from Chicago to Ontario

Discover different routes, airlines, and transfers and find the best alternative flights for your journey from Chicago to Ontario.

Cheapest
ORD
18:27
7h 32m
1 transfer
ONT
23:59
O'Hare International Airport - Ontario International Airport
Tue, May 7Frontier Airlines
£34
MDW
22:55
9h 31m
1 transfer
ONT
06:26
Midway International Airport - Ontario International Airport
Tue, May 7Frontier Airlines
£34
RFD
21:54
21h 5m
1 transfer
ONT
16:59
Chicago Rockford International Airport - Ontario International Airport
Fri, May 3Allegiant Air
£84
RFD
21:54
21h 5m
1 transfer
ONT
16:59
Chicago Rockford International Airport - Ontario International Airport
Fri, May 3Allegiant Air
£84
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How do I find the cheapest flights?

When are flight tickets from Chicago (CHI) to Ontario (ONT) the cheapest?
Airlines adjust prices for flights from Chicago to Ontario based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much are flights from Chicago (CHI) to Ontario (ONT) cost?
According to Trip.com's data, the lowest price is around £204.
What's the most popular airline for direct flights from Chicago (CHI) to Ontario (ONT)?
United Airlines operates 1 direct flights from Chicago (CHI) to Ontario (ONT).

How to find a cheap flight from Chicago to Ontario

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Chicago to Ontario. Book your flights at the right time and save more.

Book Early

Once prices are gone, they're gone. Lock in deals while you can!

Compare Flight Prices

Compare prices on travel agency and airline websites.

Look Out for Deals

Check airline and travel agency websites for latest flight deals

Check One-way Fares

Buying two cheap one-way flights can sometimes be a better deal than a round-trip.

Try Different Dates

Flying during the week, early in the morning, or late at night can help save money.

Use the Trip.com App

Save up to £10 per person when booking your flights on Trip.com

Flight Information from Chicago to Ontario

Cheapest direct flight price	£34
Cheapest return ticket price	£70
Cheapest month	September
Peak season for travel	November
Flight distance	9,812.12km
Popular airline	Alaska Airlines