There are most likely no direct flights on the Chicago — Ontario route
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 Chicago to Ontario. 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 Chicago to Ontario, 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.
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Tickets from Chicago to Ontario are getting more expensive each month. From November 2026 to July 2027, the increase reached 65%, with prices now at $166. It's unlikely to get cheaper than the current level.
The most significant price increase was from November 2026 to April 2027 — up 127%. The best time to fly is December 2026–January 2027, when the average price is $99. In April 2027–July 2027, tickets cost around $197.
Given the rising prices, it's best not to delay your purchase. Flying in December 2026–January 2027 can save you up to 50% compared to the most expensive months.
Price variation across months on this route is 37.4%. Your choice of departure month significantly affects the total flight cost.
In different months, ticket prices from Chicago to Ontario vary: minimum — $97 (December 2026), maximum — $228 (April 2027). Typically, the flight costs $100–$132.
There are most likely no direct flights on the Chicago — Ontario route
Chicago — Ontario
11/13/2026
Departure
Direct flight
UA1904
starting at $237
Chicago — Ontario
11/15/2026
Departure
Direct flight
WN1138
starting at $374
Chicago — Ontario
11/25/2026
Departure
Direct flight
UA1904
starting at $222
Chicago — Ontario
11/12/2026
Departure
Direct flight
UA1904
starting at $226
Chicago — Ontario
11/23/2026
Departure
Direct flight
WN177
starting at $245
Chicago — Ontario
11/14/2026
Departure
Direct flight
WN1138
starting at $207
The Chicago — Ontario route is served by multiple airlines, including United Airlines, Southwest Airlines, and Frontier Airlines. This is convenient for those who want the best balance of price, schedule, and travel conditions. Tickets start from $100, and depending on season and promotions, even better deals may appear. With our service, you can easily compare available options and book tickets that match your plans. The variety of carriers allows flexible choices and comfortable travel without overpaying.
The cheapest flight ticket from Chicago to Ontario according to data for the last 48 hours costs $100
Often the best time to buy tickets from Chicago to Ontario is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from Chicago to Ontario can be found flying in these months: December, January, November.
The fastest flights from Chicago to Ontario start from 6 hours 5 minutes in the air.
The following airlines operate direct flights on the route Chicago — Ontario: United Airlines, Southwest Airlines
The cheapest one-way flight from Chicago to Ontario departs on 11/23/2026, is operated by Frontier Airlines and costs $100
The cheapest roundtrip flight from Chicago to Ontario departs on 12/10/2026, is operated by Southwest Airlines and costs $144
Fastest flight from Chicago to Ontario takes 6h 5m
There are direct flights on this route 6 days a week: Su, Mo, We, Th, Fr, and Sa
The distance between Chicago and Ontario is 2754km (1707 miles). There are 13 direct flights from Chicago to Ontario. The time difference between Chicago and Ontario is 2h. Flights from Chicago begin at 10:15 AM. The latest flight from Chicago departs at 4:15 PM
