There are most likely no direct flights on the Denver — Ontario route
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A non-stop 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.
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There are most likely no direct flights on the Denver — Ontario route
Denver — Ontario
06/09/2026
Departure
Direct flight
WN1663
starting at $461
Denver — Ontario
06/08/2026
Departure
Direct flight
UA2028
starting at $436
Denver — Ontario
07/28/2026
Departure
Direct flight
UA2028
starting at $231
Denver — Ontario
07/30/2026
Departure
Direct flight
WN1663
starting at $127
Denver — Ontario
06/27/2026
Departure
Direct flight
WN1660
starting at $292
Flights from Denver to Ontario are operated by several airlines — Southwest Airlines, United Airlines, and Frontier Airlines. This allows passengers to flexibly choose flights based on departure time, cost, and additional services. The minimum ticket price starts at $65, 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.
The cheapest one-way flight from Denver to Ontario departs on 07/29/2026, is operated by Frontier Airlines and costs $65
There is no information about the cheapest roundtrip flight from Denver to Ontario
Fastest flight from Denver to Ontario takes 2h 19m
There are direct flights on this route 4 days a week: Mo, Tu, Th, and Sa
The distance between Denver and Ontario is 1289km (799 miles). The average flight duration is 2h 20m. There are 10 direct flights from Denver to Ontario. The time difference between Denver and Ontario is 1h. Flights from Denver begin at 7:45 AM. The latest flight from Denver departs at 10:29 PM
We couldn't find any special offers for flights from Denver to Ontario
The cheapest flight ticket from Denver to Ontario according to data for the last 48 hours costs $65
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: July, June, January.
The fastest flights from Denver to Ontario start from 2 hours 19 minutes in the air.
The following airlines operate direct flights on the route Denver — Ontario: Southwest Airlines, United Airlines
The cost of a one-way flight from Denver to Ontario ranges from $65 (July 2026) to $262 (January 2027). On average, the ticket price is about $150–$384.
Ticket prices for Denver — Ontario follow a predictable curve: rise, peak, and decline. This typical seasonal pattern lets you plan your purchase to avoid overpaying.
Prices rise from July 2026 to January 2027 (+305%), then decline from June 2026 to July 2026 (47%). The cheapest tickets are in June 2026–July 2026 (averaging $94), while the priciest are in July 2026–January 2027 ($163).
For savings, plan your flight for June 2026–July 2026 — you could save up to 43%. Try to avoid July 2026–January 2027 when possible: prices are at their highest then.
Price spread on this route is 55.3%. Costs depend heavily on the season, so flexibility in choosing your departure month is especially valuable here.