There are most likely no direct flights on the Ontario — Denver route
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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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There are most likely no direct flights on the Ontario — Denver route
The Ontario — Denver route shows a classic seasonal pattern: prices rise, peak, then fall again. Knowing this, you can pick a more affordable time to fly.
Prices rise from December 2026 to January 2027 (+123%), then decline from November 2026 to December 2026 (48%). The cheapest tickets are in November 2026–December 2026 (averaging $50), while the priciest are in December 2026–January 2027 ($56).
For savings, plan your flight for November 2026–December 2026 — you could save up to 10%. Try to avoid December 2026–January 2027 when possible: prices are at their highest then.
Price spread on this route is 30.4%. Costs depend heavily on the season, so flexibility in choosing your departure month is especially valuable here.
The minimum one-way ticket price from Ontario to Denver is $34 (December 2026), while the maximum is $77 (January 2027). On average, a ticket costs $59–$143.
Ontario — Denver
11/08/2026
Departure
Direct flight
F91500
starting at $256
Ontario — Denver
11/06/2026
Departure
Direct flight
UA2446
starting at $173
Ontario — Denver
11/12/2026
Departure
Direct flight
F91262
starting at $263
Ontario — Denver
11/13/2026
Departure
Direct flight
F91500
starting at $292
starting at $174
starting at $173
The route Ontario — Denver is served by several airlines: Frontier Airlines and United 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 $173 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 $173
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: December, November, January.
The fastest flights from Ontario to Denver start from 2 hours 17 minutes in the air.
The following airlines operate direct flights on the route Ontario — Denver: Frontier Airlines, United Airlines
The cheapest one-way flight from Ontario to Denver departs on 11/06/2026, is operated by United Airlines and costs $173
There is no information about the cheapest roundtrip flight from Ontario to Denver
Fastest flight from Ontario to Denver takes 2h 17m
There are direct flights on this route 3 days a week: Su, Th, and Fr
The distance between Ontario and Denver is 1289km (799 miles). There are 67 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 5:55 PM
We couldn't find any special offers for flights from Ontario to Denver