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Cheap Flights from Ontario to Chicago, IL, United States - ONT to CHI

Popular flights from Ontario to Chicago

We’ve got the inside scoop on finding the best time to fly for the best price. Not sure when to travel for your next vacation? Find details below on when-to-fly and when-to-buy.

Alaska Airlines
Departure Date Return Date Lowest Price
Aug 7, 2016 Aug 14, 2016 $315
Aug 7, 2016 Aug 11, 2016 $315
Aug 12, 2016 Aug 16, 2016 $315
Aug 14, 2016 Aug 30, 2016 $315
Aug 15, 2016 Aug 18, 2016 $315
American Airlines
Departure Date Return Date Lowest Price
May 18, 2016 Jun 1, 2016 $274
Jun 1, 2016 Jun 4, 2016 $274
Aug 24, 2016 Sep 7, 2016 $274
Aug 24, 2016 Aug 28, 2016 $274
Aug 31, 2016 Sep 7, 2016 $274
United Airlines
Departure Date Return Date Lowest Price
Jun 8, 2016 Jun 18, 2016 $244

How Much Does it Cost to Fly from Ontario to Chicago (ONT to CHI)?

We have collected flight cost data from across the web for travel from Ontario to Chicago, and have found the average flight price for this trip to be $282.

When Can I Buy the Cheapest Flight from Ontario to Chicago (ONT to CHI)?

Airlines can adjust prices for plane tickets from Ontario to Chicago based on the day and time that you decide to book your flight. We have collected data from all airlines, and have discovered that the best days to book flights are Tuesdays, Wednesdays, and Saturdays. Read our article to find more information about the best time to buy airline tickets.

How far in advance should you book flights from Ontario to Chicago

The chart below shows up-to-date information regarding how far in advance a flight from Ontario to Chicago should be booked.

Non Stop versus 1-Stop
Advanced PurchaseNon StopOne Stop
< 7 days $0 $343
7-14 days $406 $285
14-21 days $315 $274
21-30 days $289 $274
30-60 days $257 $244
60-90 days $357 $274
90+ days $282 $271

Cheapest Day To Fly from Ontario to Chicago

The chart below shows up-to-date information regarding the cheapest days to fly from Ontario to Chicago.

Monday Tuesday Wednesday Thursday Friday Saturday Sunday
$289 $282 $244 $257 $274 $284 $344

Lowest Fares Chart By Month from Ontario to Chicago

The chart below shows the lowest fare by month when flying from Ontario to Chicago.

Month Origin Destination Carrier Depart Date Return Date Stops Price
May Ontario Chicago American 5/18/16 6/1/16 1 $274
June Ontario Chicago United 6/8/16 6/18/16 1 $244
July Ontario Chicago United 7/15/16 7/23/16 1 $274
August Ontario Chicago American 8/24/16 8/28/16 1 $274
September Ontario Chicago American 9/3/16 9/4/16 1 $274
October Ontario Chicago American 10/4/16 10/9/16 1 $274
November Ontario Chicago American 11/11/16 11/13/16 1 $271
December Ontario Chicago American 12/1/16 12/4/16 1 $274

Round Trip vs One Way Flights from Ontario to Chicago (ONT to CHI)

We have found that there is often no price difference between buying a round trip flight versus a one way flight. Increased flexibility is the main benefit when it comes to buying a one way flight from Ontario to Chicago. However, booking a round trip flight can be a simpler process. You can compare round trip and one way flights by using our flight comparison.

The average price for one way flights from Ontario to Chicago is $115.

The average price for round trip flights from Ontario to Chicago is $300.

Ontario to Chicago Flight Questions

Below are some common questions that asked about this flight route:

Question: What are the most popular connecting cities when flying from Ontario to Chicago?
Answer: Denver, CO

Airlines Flying from Ontario to Chicago (ONT to CHI)

Below are the different airlines that fly from Ontario to Chicago with the average price of their plane tickets. Just remember that different airlines offer different levels of comfort and service, so consider convenience when choosing your airline.

Below is the full flight schedule summary of the next 30 days for flights from Ontario to Chicago.

Ontario to Chicago
Airline Connections Mon Tue Wed Thu Fri Sat Sun
American PHX X X X X X X X
Alaska PDX X X X X X X X
Delta SLC X X X X X X
Delta SLC / MSP X X X X X X X
United SFO X X X X X X X
Southwest - X X X X X X X
Southwest DEN X X X X X X X

Airports for Your Route

These pages contain information about the major airports in Ontario and Chicago, so you can feel comfortable knowing how to get around whether you are about to take off or you just landed.

Cheap Domestic Flights to Chicago - CHI

FlightsAirlineLowest Price
Los Angeles to Chicago American, Alaska, JetBlue, Frontier, Spirit, United, Virgin America $150
San Diego to Chicago American, Alaska, Frontier, Spirit, United, Virgin America $177
Las Vegas to Chicago American, Alaska, Frontier, Spirit, United, Virgin America $90
Santa Ana to Chicago American, Alaska, Frontier, United $190
Burbank to Chicago American, Alaska, United $222
Palm Springs to Chicago American, Alaska, United, Virgin America $322
Long Beach to Chicago American, Alaska, JetBlue, United $300
Bakersfield to Chicago American, United $472
Santa Barbara to Chicago American, Alaska, United $449
Yuma to Chicago American, Alaska $365
San Luis Obispo to Chicago American, United $472
Palomar to ChicagoCheck Dates
Los Angeles to New York American, Alaska, JetBlue, Frontier, Spirit, Sun Country, United, Virgin America $208
Los Angeles to Atlanta American, Alaska, Frontier, Spirit, United $236
Los Angeles to Milwaukee American, Alaska, Frontier, United $244
Los Angeles to Dallas - Ft Worth American, Alaska, Frontier, Spirit, United, Virgin America $106
Los Angeles to Detroit American, Alaska, JetBlue, Frontier, Spirit, United $243
Las Vegas to Milwaukee American, Alaska, Frontier, United $168
Los Angeles to Las Vegas American, Spirit, United, Virgin America $71
Las Vegas to New York American, Alaska, JetBlue, Spirit, Sun Country, United, Virgin America $236
Los Angeles to Indianapolis American, Alaska, Frontier, United $204
Los Angeles to Minneapolis - St Paul American, Alaska, Frontier, Spirit, Sun Country, United $207
Los Angeles to Denver American, Alaska, Frontier, Spirit, United, Virgin America $97
Los Angeles to St Louis American, Alaska, Frontier, United $244
Los Angeles to Madison American, Alaska, Frontier, United $333
San Diego to Milwaukee American, Alaska, Frontier, United $261
Las Vegas to Detroit American, Alaska, JetBlue, Frontier, Spirit, United $198
San Diego to Atlanta American, Alaska, JetBlue, Frontier, Spirit, United $321

Cheap International Flights to Chicago - CHI

FlightsAirlineLowest Price
Tijuana to Chicago American, AeroMexico, Alaska, United, Virgin America, Volaris $357
Los Angeles to Toronto American, Air Canada, Alaska, JetBlue, Frontier, Spirit, Sun Country, United, Virgin America, WestJet, Great Lakes $360
Cheap Flights from Ontario to Chicago, IL, United States, from $244 Round trip from ONT to CHI