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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 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.
A direct flight is the easiest way to get to your destination. The following airlines operate non-stop flights from Ontario to Denver:
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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.
Unable to find information about the schedule of direct flights from
Ontario — Denver
03/30/2026
Departure
Direct flight
UA2446
starting at $177
Ontario — Denver
02/16/2026
Departure
Direct flight
WN3022
starting at $204
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 $67 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 one-way flight from Ontario to Denver departs on 02/16/2026, is operated by Frontier Airlines and costs $67
The cheapest roundtrip flight from Ontario to Denver departs on 02/13/2026, is operated by Frontier Airlines and costs $123
Fastest flight from Ontario to Denver takes 5h 7m
There are direct flights on this route 1 day a week: Mo
The distance between Ontario and Denver is 1289km (799 miles). There are 48 direct flights from Ontario to Denver. The time difference between Ontario and Denver is 1h. Flights from Ontario begin at 5:05 AM. The latest flight from Ontario departs at 4:15 PM
We couldn't find any special offers for flights from Ontario to Denver
The cheapest flight ticket from Ontario to Denver according to data for the last 48 hours costs $67
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: April, February, March.
The fastest flights from Ontario to Denver start from 5 hours 7 minutes in the air.
The following airlines operate direct flights on the route Ontario — Denver: United Airlines, Southwest Airlines
The minimum one-way ticket price from Ontario to Denver is $36 (April 2026), while the maximum is $70 (March 2026). On average, a ticket costs $52–$120.