Helping travelers to find the best flight offers
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 Denver to Ontario. We have connected more than 40 airlines and airline ticketing agencies to help you find the most suitable and affordable flight option.
We carefully collect statistics on the search and pricing of airlines and, based on these data, we make an assumption about future prices. Thus, you can better understand which season is the cheapest to fly from Denver to Ontario
A direct flight is the most convenient and comfortable way to fly from Denver to Ontario, 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 Denver to Ontario:
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.
The cheapest one-way flight from Denver to Ontario departs on 10/23/2025, is operated by Frontier Airlines and costs $47
The cheapest roundtrip flight from Denver to Ontario departs on 11/24/2025, is operated by Southwest Airlines and costs $152
Fastest flight from Denver to Ontario takes 2h 30m
There are direct flights on this route 1 day a week: Th
The distance between Denver and Ontario is 1289km (799 miles). There are 71 direct flights from Denver to Ontario. The time difference between Denver and Ontario is 1h. Flights from Denver begin at 7:40 AM. The latest flight from Denver departs at 10:55 PM
Flights from Denver to Ontario are operated by several airlines — Frontier Airlines and United Airlines. This allows passengers to flexibly choose flights based on departure time, cost, and additional services. The minimum ticket price starts at $47, making this destination accessible to travelers with different budgets. We help compare all available options in real time, so you can book tickets at the best value for money. The service ensures transparent search and lets you book affordable flights in just a few clicks.
Starting at $47
Starting at $148
Denver — Los Angeles
10/12/2025
Departure
Direct flight
F94371
Starting at $207
Denver — Los Angeles
10/22/2025
Departure
Direct flight
UA564
Starting at $148
Denver — Ontario
10/12/2025
Departure
Direct flight
UA1574
Starting at $181
Unable to find information about the schedule of direct flights from
The cheapest flight ticket from Denver to Ontario according to data for the last 48 hours costs $47
Often the best time to buy tickets from Denver to Ontario is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from Denver to Ontario can be found flying in these months: October.
The fastest flights from Denver to Ontario start from 2 hours 30 minutes in the air.
The following airlines operate direct flights on the route Denver — Ontario: Frontier Airlines, United Airlines
We couldn't find any special offers for flights from Denver to Ontario