Cheap flights from Ontario to Denver
From 100 USD — compare hundreds of airlines
About this route
Compare flights from Ontario to Denver, a about 1,289 km route (around 2h 7m nonstop). We gather live prices from hundreds of airlines and agencies so you can find the cheapest and book on the official site, with no hidden fees. Direct flights are available. Airlines such as United Airlines, Silk Avia, Southwest Airlines operate this route.
Prices by date
Airlines on this route
FAQ
What's the cheapest month to fly Ontario to Denver?
It's usually 2026-07, from 135 USD. Use the price calendar to compare other dates.
How long is the flight from Ontario to Denver?
A nonstop flight takes about 2h 7m and covers around 1,289 km. Connecting itineraries take longer.
Are there direct flights from Ontario to Denver?
Yes, this route has nonstop flights. Filter by "nonstop" to see them.
Which airlines fly from Ontario to Denver?
United Airlines, Silk Avia, Southwest Airlines operate this route, among others. Compare them all in the results.
When should I book Ontario–Denver flights?
As a rule of thumb, booking 3–8 weeks ahead and avoiding weekends and holidays tends to give the best prices. Use the calendar to spot the cheapest dates.