₩146,200 Cheap Flights from Denver (DEN) to Ontario (ONT)

View ₩146,200 flight on Wed, Aug 12, 2026Opens in a new window

Flight 1

Popular airlines from Denver Intl. Airport (DEN) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Denver to Ontario (DEN-ONT)

Prices were available within the past 7 days and start at ₩146,200 for one-way flights and ₩351,600 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, Jun 1 - Wed, Jun 3
DEN
Denver
ONT
Ontario
₩351,600 Roundtrip, found 3 days ago
₩351,600
Roundtrip
found 3 days ago
Select Delta flight, departing Mon, Jun 1 from Denver to Ontario, returning Wed, Jun 3, priced at ₩351,600 found 3 days ago
Delta
Mon, May 11 - Fri, May 15
DEN
Denver
ONT
Ontario
₩368,100 Roundtrip, found 1 day ago
₩368,100
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, May 11 from Denver to Ontario, returning Fri, May 15, priced at ₩368,100 found 1 day ago
Delta
Mon, Jun 1 - Wed, Jun 3
DEN
Denver
ONT
Ontario
₩390,400 Roundtrip, found 3 days ago
₩390,400
Roundtrip
found 3 days ago
Select Delta flight, departing Mon, Jun 1 from Denver to Ontario, returning Wed, Jun 3, priced at ₩390,400 found 3 days ago
Delta
Mon, May 11 - Fri, May 15
DEN
Denver
ONT
Ontario
₩412,700 Roundtrip, found 1 day ago
₩412,700
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, May 11 from Denver to Ontario, returning Fri, May 15, priced at ₩412,700 found 1 day ago
Delta
Mon, May 11 - Fri, May 15
DEN
Denver
ONT
Ontario
₩413,100 Roundtrip, found 1 day ago
₩413,100
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, May 11 from Denver to Ontario, returning Fri, May 15, priced at ₩413,100 found 1 day ago
United
Mon, May 11 - Fri, May 15
DEN
Denver
ONT
Ontario
₩427,700 Roundtrip, found 1 day ago
₩427,700
Roundtrip
found 1 day ago
Select United flight, departing Mon, May 11 from Denver to Ontario, returning Fri, May 15, priced at ₩427,700 found 1 day ago
Delta
Mon, May 11 - Fri, May 15
DEN
Denver
ONT
Ontario
₩442,600 Roundtrip, found 1 day ago
₩442,600
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, May 11 from Denver to Ontario, returning Fri, May 15, priced at ₩442,600 found 1 day ago
Delta
Mon, Jun 1 - Wed, Jun 3
DEN
Denver
ONT
Ontario
₩455,200 Roundtrip, found 3 days ago
₩455,200
Roundtrip
found 3 days ago
Select Delta flight, departing Mon, Jun 1 from Denver to Ontario, returning Wed, Jun 3, priced at ₩455,200 found 3 days ago
Delta
Mon, May 11 - Fri, May 15
DEN
Denver
ONT
Ontario
₩457,700 Roundtrip, found 1 day ago
₩457,700
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, May 11 from Denver to Ontario, returning Fri, May 15, priced at ₩457,700 found 1 day ago
American Airlines
Mon, Jun 1 - Wed, Jun 3
DEN
Denver
ONT
Ontario
₩492,300 Roundtrip, found 3 days ago
₩492,300
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon, Jun 1 from Denver to Ontario, returning Wed, Jun 3, priced at ₩492,300 found 3 days ago

Find the cheapest month to fly from Denver (DEN) to Ontario (ONT)

March is typically the cheapest month to fly

From ₩70,012 - ₩483,300 per traveler.

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 ₩351,600. 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 canceled 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 kilometers 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.

Travel information

Origin airport
Denver Intl.
Destination airport
Los Angeles - Ontario Intl.
Roundtrip price
₩351,600
Distance
1306 km
Average flight time
1 hour 21 mins

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