There are most likely no direct flights on the Ontario — Denver 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 Ontario to Denver. 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 Denver, 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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There are most likely no direct flights on the Ontario — Denver route
The minimum one-way ticket price from Ontario to Denver is $102 (September 2026), while the maximum is $128 (October 2026). On average, a ticket costs $114–$240.
Flight prices from Ontario to Denver barely change from month to month. You can comfortably choose any convenient dates — there won't be a significant overpayment.
There is a slight difference: it's a bit cheaper in September 2026–October 2026 (averaging $115) and slightly more in October 2026–December 2026 ($120). But overall, the difference is small.
On this route, you don't need to target specific months — prices are stable. The difference between the cheapest and most expensive period is only 4%. Book whenever it's convenient.
Monthly price variation is just 9.5%. Ticket costs on this route are among the most predictable.
Ontario — Denver
10/09/2026
Departure
Direct flight
UA2446
starting at $115
Ontario — Denver
09/12/2026
Departure
Direct flight
WN2239
starting at $663
Ontario — Denver
09/13/2026
Departure
Direct flight
UA1263
starting at $423
Ontario — Denver
09/17/2026
Departure
Direct flight
F91500
starting at $220
The route Ontario — Denver is served by several airlines: United Airlines, Southwest 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 $71 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 Denver according to data for the last 48 hours costs $71
Often the best time to buy tickets from Ontario to Denver is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from Ontario to Denver can be found flying in these months: September, December, October.
The fastest flights from Ontario to Denver start from 2 hours 26 minutes in the air.
The following airlines operate direct flights on the route Ontario — Denver: United Airlines, Southwest Airlines, Frontier Airlines
The cheapest one-way flight from Ontario to Denver departs on 10/09/2026, is operated by Frontier Airlines and costs $71
There is no information about the cheapest roundtrip flight from Ontario to Denver
Fastest flight from Ontario to Denver takes 2h 26m
There are direct flights on this route 4 days a week: Su, Th, Fr, and Sa
The distance between Ontario and Denver is 1289km (799 miles). There are 69 direct flights from Ontario to Denver. The time difference between Ontario and Denver is 1h. Flights from Ontario begin at 5:00 AM. The latest flight from Ontario departs at 6:30 PM
We couldn't find any special offers for flights from Ontario to Denver