Cheap flights from Ontario to Chicago

Flights starting at $185. Choose between Frontier Airlines, United Airlines, or American Airlines to find the best price.

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Travelers usually depart from Ontario International, Ontario Bus Stop, Ontario, CA station, or Montclair (Ontario) when they travel from Ontario to Chicago. Book your trip to arrive at O Hare International, Chicago Midway International, Chicago, IL - Union Station, Chicago Rockford International, or Chicago Downtown Greyhound Station. The distance between Ontario and Chicago is 2742 km. The most popular airlines for this route are Frontier Airlines, United Airlines, American Airlines, Delta Air Lines, and Allegiant Air. Ontario and Chicago have 401 direct flights per week.

Weekly direct flights

MondaysTuesdaysWednesdaysThursdaysFridaysSaturdaysSundays
Direct flights1111111
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Frontier Airlines on Mondays, Tuesdays, Wednesdays, Thursdays, Fridays, Saturdays, and Sundays.

Check-in for a flight from Ontario to Chicago

NameCarrier codeIATA CodePassport needed during bookingOnline check-in available
Frontier AirlinesFFTF9NoOpens 24 days before flight
Closes 1 hours before flight
United AirlinesUALUAYesNo
American AirlinesAALAAYesNo
Delta Air LinesDALDLYesOpens 24 days before flight
Closes 1 hours before flight
Allegiant AirAAYG4NoOpens 24 days before flight
Closes 1 hours before flight
Learn more about COVID-19 restrictions in United States in our dedicated Stories article.

Frequently asked questions

How long does it take to travel from Ontario to Chicago?
A one-way nonstop (direct) flight between Ontario and Chicago takes around 3.8 hours.
What is the flight distance between Ontario and Chicago?
The flight distance between Ontario and Chicago is 2742 km.
What airlines offer nonstop (direct) flights between Ontario and Chicago?
Several carriers operate flights between Ontario and Chicago. Airlines offering nonstop (direct) flights include Frontier Airlines.
What are the most popular routes to and from Ontario?
Travelers frequently search for route combinations, such as Ontario and Denver, Orlando, Austin, Las Vegas, Atlanta, Sacramento, San Francisco, Seattle, San Antonio, Guadalajara, Charlotte, New Orleans, Fort Lauderdale, Philadelphia, Washington, D.C., Oakland, San Jose, Detroit, Minneapolis, Houston.
What are the most popular routes to and from Chicago?
Travelers frequently search for route combinations, such as Chicago and Phoenix, Las Vegas, Denver, Orlando, San Francisco, Los Angeles, Tampa, Miami, Salt Lake City, New York, Atlanta, London, Sacramento, Minneapolis, Mexico City, Paris, Austin, Washington, D.C., Fort Lauderdale, Fort Myers.
What airports are near Ontario?
The main airport in Ontario is Ontario International. It is also served by San Diego International, Ontario International, Tijuana International, John Wayne, Hollywood Burbank, Palm Springs International, Santa Barbara Municipal, Imperial County, Meadows Field, Long Beach.
What airports are near Chicago?
The main airport in Chicago is O Hare International. It is also served by Gerald R. Ford International, General Mitchell International, General Wayne A. Downing Peoria International, Dane County Regional, Fort Wayne International, Central Illinois Regional, South Bend International, Quad City International, Kalamazoo/Battle Creek International, Decatur.
Is it possible to combine flights, buses, and trains in one itinerary when traveling between Ontario and Chicago?
Yes, it's possible to combine different modes of transport between Ontario and Chicago thanks to our Virtual Interlining technology. Making use of not only flights but also trains and buses between Ontario and Chicago can give rise to new adventures. Read more about how Virtual Interlining works on Kiwi.com Stories.
What is Virtual Interlining and how do I use it?
Virtual Interlining provides a revolutionary way of traveling. You can combine different modes of transport like flights, trains, and buses into one itinerary. And this often saves money. Thanks to the world's largest carrier database, the Kiwi.com search function enables anyone to mix and match different modes of transport easily.
Which airlines fly between Ontario and Chicago?
When's the best time to travel between Ontario and Chicago?
What flights operate between Ontario and Chicago?
How many airports are there near Ontario?
How many airports are there near Chicago?
What time do nonstop (direct) flights between Ontario and Chicago depart?
What time do nonstop (direct) flights between Ontario and Chicago arrive?
What time do flights between Ontario and Chicago depart?
What time do flights between Ontario and Chicago arrive?

Planning a trip? Thanks to our Virtual Interlining algorithm, we offer billions of route combinations between any A and any B in the world by plane, train, and bus. Find the cheapest routes and best deals for you, as well as the best dates on which to travel.

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