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Flaut.Travel was designed and developed by a team dedicated to making the process of searching, comparing and booking airline tickets as easy and convenient as possible. Our service helps travelers to find and buy the cheapest flights from Ontario to Chicago. We have connected more than 40 airlines and airline ticketing agencies to help you find the most suitable and affordable flight option.
A non-stop flight is the most convenient and comfortable way to fly from Ontario to Chicago, despite the fact that sometimes flights with transfers can cost significantly less.
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Answers to questions about the route that travelers are most interested in.
We keep tight track on airlines' pre-holidays sales and other special offers occurences all the time to let you save maximum amount of funds while traveling to your family or just going out on vacation.
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The minimum one-way ticket price from Ontario to Chicago is $125 (May 2026), while the maximum is $237 (December 2026). On average, a ticket costs $188–$447.
Flight prices from Ontario to Chicago are steadily rising: from May 2026 to December 2026, ticket costs increased by 89%. The sooner you book, the better the deal.
The most significant price increase was from May 2026 to December 2026 — up 89%. The best time to fly is May 2026–June 2026, when the average price is $129. In September 2026–December 2026, tickets cost around $229.
Given the rising prices, it's best not to delay your purchase. Flying in May 2026–June 2026 can save you up to 44% compared to the most expensive months.
Price variation across months on this route is 26.1%. Your choice of departure month significantly affects the total flight cost.
Ontario — Chicago
05/20/2026
Departure
Direct flight
WN3658
starting at $627
Ontario — Chicago
05/21/2026
Departure
Direct flight
WN3658
starting at $627
Ontario — Chicago
05/16/2026
Departure
Direct flight
UA2226
starting at $640
Ontario — Chicago
05/17/2026
Departure
Direct flight
UA2226
starting at $702
Ontario — Chicago
05/11/2026
Departure
Direct flight
UA1851
starting at $627
Ontario — Chicago
05/14/2026
Departure
Direct flight
UA2226
starting at $622
The route Ontario — Chicago is served by several airlines: Southwest Airlines, United Airlines, and Frontier Airlines. This gives passengers more freedom in choosing flights. You can consider not only the price but also schedules, baggage policies, and onboard service. Our service compares all offers so you can find tickets from $151 and choose the most convenient option. Thanks to airline competition, you may also find promotional fares or special offers, helping you save even more. Plan your trip in advance and choose the best flights without overpaying.
The cheapest flight ticket from Ontario to Chicago according to data for the last 48 hours costs $151
Often the best time to buy tickets from Ontario to Chicago is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from Ontario to Chicago can be found flying in these months: May, June, September.
The fastest flights from Ontario to Chicago start from 7 hours 42 minutes in the air.
The following airlines operate direct flights on the route Ontario — Chicago: Southwest Airlines, United Airlines
The cheapest one-way flight from Ontario to Chicago departs on 05/19/2026, is operated by Frontier Airlines and costs $151
The cheapest roundtrip flight from Ontario to Chicago departs on 06/18/2026, is operated by Frontier Airlines and costs $237
Fastest flight from Ontario to Chicago takes 7h 42m
There are direct flights on this route 5 days a week: Su, Mo, We, Th, and Sa
The distance between Ontario and Chicago is 2754km (1707 miles). There are 13 direct flights from Ontario to Chicago. The time difference between Ontario and Chicago is 2h. Flights from Ontario begin at 6:45 AM. The latest flight from Ontario departs at 11:55 PM
