Denver to Ontario flights

Routavio compares airline fares from several flight booking sites. Search Denver to Ontario to see the lowest price before you book.

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Lowest fare seen

€49Seen on 7 Oct 2026

Last checked

29 Oct 2026

Observed fares. Prices may change.

Your next trip, last seen at €49

Lowest observed

23 Feb 2027

One way

Cheapest observed day · Last checked: 7 Oct 2026

When to fly

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One-way fare

One-way fare · No data: click and we will search

Airlines seen: United Airlines, Southwest Airlines, Alaska Airlines, American Airlines, Delta Air Lines, Frontier Airlines
Reported fastest flight: 2h 18m
Non-stop: Yes

Short answer

Routavio has seen United Airlines fares from Denver to Ontario, non-stop. These are prices Routavio's searches returned on the dates shown, not quotes; run a live search for today's fare. Lowest fare seen: €49 on 7 Oct 2026.

About this route

Explore the fares we observed from Denver to Ontario. Prices move often, so pick your dates to see the latest options.

Route distance: 1,289 km
Reported fastest flight: 2h 18m
Alternative airports: APA

Route-level information; individual journeys vary.
Published schedules report non-stop service with United Airlines, Southwest Airlines. Check current timetables.

A clearer picture of your fare

Observed, not guaranteed

Every price is a fare we actually saw, and it may change at any time.

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The price is final on the provider's site, where your booking is completed.

How our prices work

Airport to city: straight-line distance

Denver International Airport (DEN) → Denver, city gazetteer reference point (39.7392, -104.9847): ≈ 30 km.
Ontario International Airport (ONT) → Ontario, city gazetteer reference point (34.0500, -117.6400): ≈ 4 km.

Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.

Frequently asked

How much was a flight from Denver to Ontario?

A fare of €49 was seen on 7 Oct 2026. Fares change, so search your dates for the current price.

Are there direct flights from Denver to Ontario?

Yes. Published schedules report non-stop flights on this route with United Airlines, Southwest Airlines.

Which airlines fly from Denver to Ontario?

Routavio has seen these carriers on the route: United Airlines, Southwest Airlines, Alaska Airlines, American Airlines, Delta Air Lines, Frontier Airlines.

How many of the observed Denver to Ontario fares were non-stop?

9 of the 13 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.

How observed prices work, what "No data" means and what a fare includes: Read the flight price guide