S$147 Cheap Flights from Denver to Ontario

View S$147 flight on Wed, 23 Apr,2025Opens in a new window

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Cheap Flights from Denver to Ontario (DEN-ONT)

Prices were available within the past 7 days and start at S$147 for one-way flights and S$320 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, 23 Apr - Mon, 28 Apr
DEN
Denver
ONT
Ontario
S$320 Return, found 1 day ago
S$320
Return
found 1 day ago
Select Delta flight, departing Wed, 23 Apr from Denver to Ontario, returning Mon, 28 Apr, priced at S$320 found 1 day ago
United
Wed, 23 Apr - Mon, 28 Apr
DEN
Denver
ONT
Ontario
S$347 Return, found 1 day ago
S$347
Return
found 1 day ago
Select United flight, departing Wed, 23 Apr from Denver to Ontario, returning Mon, 28 Apr, priced at S$347 found 1 day ago
United
Wed, 23 Apr - Mon, 28 Apr
DEN
Denver
ONT
Ontario
S$361 Return, found 1 day ago
S$361
Return
found 1 day ago
Select United flight, departing Wed, 23 Apr from Denver to Ontario, returning Mon, 28 Apr, priced at S$361 found 1 day ago
American Airlines
Wed, 23 Apr - Mon, 28 Apr
DEN
Denver
ONT
Ontario
S$368 Return, found 1 day ago
S$368
Return
found 1 day ago
Select American Airlines flight, departing Wed, 23 Apr from Denver to Ontario, returning Mon, 28 Apr, priced at S$368 found 1 day ago
Delta
Wed, 23 Apr - Mon, 28 Apr
DEN
Denver
ONT
Ontario
S$422 Return, found 1 day ago
S$422
Return
found 1 day ago
Select Delta flight, departing Wed, 23 Apr from Denver to Ontario, returning Mon, 28 Apr, priced at S$422 found 1 day ago
United
Thu, 27 Feb - Mon, 3 Mar
DEN
Denver
ONT
Ontario
S$430 Return, found 2 days ago
S$430
Return
found 2 days ago
Select United flight, departing Thu, 27 Feb from Denver to Ontario, returning Mon, 3 Mar, priced at S$430 found 2 days ago
American Airlines
Wed, 23 Apr - Mon, 28 Apr
DEN
Denver
ONT
Ontario
S$449 Return, found 1 day ago
S$449
Return
found 1 day ago
Select American Airlines flight, departing Wed, 23 Apr from Denver to Ontario, returning Mon, 28 Apr, priced at S$449 found 1 day ago
American Airlines
Wed, 23 Apr - Mon, 28 Apr
DEN
Denver
ONT
Ontario
S$449 Return, found 1 day ago
S$449
Return
found 1 day ago
Select American Airlines flight, departing Wed, 23 Apr from Denver to Ontario, returning Mon, 28 Apr, priced at S$449 found 1 day ago
American Airlines
Thu, 27 Feb - Mon, 3 Mar
DEN
Denver
ONT
Ontario
S$451 Return, found 2 days ago
S$451
Return
found 2 days ago
Select American Airlines flight, departing Thu, 27 Feb from Denver to Ontario, returning Mon, 3 Mar, priced at S$451 found 2 days ago
Hawaiian Airlines
Thu, 27 Feb - Mon, 3 Mar
DEN
Denver
ONT
Ontario
S$732 Return, found 2 days ago
S$732
Return
found 2 days ago
Select Hawaiian Airlines flight, departing Thu, 27 Feb from Denver to Ontario, returning Mon, 3 Mar, priced at S$732 found 2 days ago
Denver to Ontario route information
Origin airport
Denver Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines, Delta, Hawaiian Airlines, United
Return price
S$320
Distance
1306 km

Flights from Denver to Los Angeles

When looking for plane tickets from Denver to Los Angeles, the ease and convenience of using Expedia simply can’t be beat. With tons of departure points and flights options from the top airline carriers, Expedia gives you the widest array of cheap flights to Los Angeles. Look for DEN to ONT airfare with the assurance that you have the largest online travel agency working for you.

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Browse through dozens of options and rest assured that you’re seeing the best price guaranteed! Our friendly customer service representatives are here to serve you 24 hours day to provide assistance and answer any questions that you may have about booking your Denver to Los Angeles trip. There’s simply no substitute for great prices suited to your travel needs and backed by excellent customer support.

Combine your Los Angeles flight with a hotel and/or car rental for a package deal designed to save you even more money! Discover additional savings by booking in advance or find a last minute deal. There are tons of ways to save on your flights from Denver to Los Angeles with Expedia. Use us as your stop travel destination and have the confidence that you’re getting a bargain!

Frequently asked questions

How much is a flight from Denver Intl. Airport (DEN) to Ontario Airport?
Round-trip tickets from DEN to Ontario Airport start from S$320. This price is based on fares quoted within the last 7 days on Expedia for flights departing within the next year — book ASAP to avoid missing out. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from DIA airport to ONT?
Most flights can be cancelled online, but every air carrier has different terms and conditions. If you do decide to cancel your flight, check out our Customer Service Portal and follow the instructions.
How do I find cheap flights from DEN to ONT that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you’re searching for Denver Airport to Los Angeles - Ontario Intl. Airport (ONT) flights, you’ll see a “no change fees” filter for you to select.
How far is the flight from Denver Airport to ONT?
A flight distance of just 1,300 kilometres separates Denver and Ontario. Once you’re up in the skies, you won’t get a chance to do much more than read the magazine in your seat pocket.
Which airlines fly direct from DEN to Los Angeles - Ontario Intl. Airport (ONT)?
A popular airline that flies from DEN to Ontario Airport is Southwest Airlines (WN). It offers 99 monthly flights. Operating 60 flights each month along this route, Frontier Airlines (F9) is another top pick.
Are DEN to ONT flight tickets cheaper when they're purchased at the last minute?
Late planners can sometimes find a bargain, with some of the cheapest airfares from Denver Airport to Ontario Airport surfacing a few weeks prior to the departure date. If you’d rather book ahead, Expedia compares and updates the best flight deals regularly — as early as 12 months in advance in some cases. It depends on the carrier though, as not all airlines quote prices that far in advance.
Ontario Airports

Los Angeles

Denver to Los Angeles Intl.
S$266.30

Orange County

Denver to John Wayne
S$417.90
*Available to Expedia members.