Cheap Flights From Denver Intl. (DEN) To Ontario Intl. Airport (ONT)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly

Cheapest Flights from Denver (DEN) to Ontario Intl. Airport (ONT)

The cheapest flights to Ontario Intl. Airport found within the past 7 days were CA $635 round trip and CA $238 one way. Prices and availability subject to change. Additional terms may apply.

Thu, Aug 20 - Tue, Aug 25
DEN
Denver
ONT
Ontario
CA $635 Roundtrip, found 1 day ago
CA $635
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Aug 20 from Denver to Ontario, returning Tue, Aug 25, priced at CA $635 found 1 day ago
Sat, Sep 19 - Sun, Sep 27
DEN
Denver
ONT
Ontario
CA $668 Roundtrip, found 4 hours ago
CA $668
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Sat, Sep 19 from Denver to Ontario, returning Sun, Sep 27, priced at CA $668 found 4 hours ago
Thu, Aug 20 - Tue, Aug 25
DEN
Denver
ONT
Ontario
CA $679 Roundtrip, found 1 day ago
CA $679
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Aug 20 from Denver to Ontario, returning Tue, Aug 25, priced at CA $679 found 1 day ago
Thu, Aug 20 - Tue, Aug 25
DEN
Denver
ONT
Ontario
CA $715 Roundtrip, found 1 day ago
CA $715
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Aug 20 from Denver to Ontario, returning Tue, Aug 25, priced at CA $715 found 1 day ago
Thu, Aug 20 - Tue, Aug 25
DEN
Denver
ONT
Ontario
CA $729 Roundtrip, found 1 day ago
CA $729
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Aug 20 from Denver to Ontario, returning Tue, Aug 25, priced at CA $729 found 1 day ago
Thu, Aug 20 - Tue, Aug 25
DEN
Denver
ONT
Ontario
CA $736 Roundtrip, found 1 day ago
CA $736
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Aug 20 from Denver to Ontario, returning Tue, Aug 25, priced at CA $736 found 1 day ago
Sat, Sep 19 - Sun, Sep 27
DEN
Denver
ONT
Ontario
CA $741 Roundtrip, found 4 hours ago
CA $741
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Sat, Sep 19 from Denver to Ontario, returning Sun, Sep 27, priced at CA $741 found 4 hours ago
Mon, Dec 21 - Fri, Dec 25
DEN
Denver
ONT
Ontario
CA $743 Roundtrip, found 1 day ago
CA $743
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Mon, Dec 21 from Denver to Ontario, returning Fri, Dec 25, priced at CA $743 found 1 day ago
Sat, Sep 19 - Sun, Sep 27
DEN
Denver
ONT
Ontario
CA $781 Roundtrip, found 4 hours ago
CA $781
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Sat, Sep 19 from Denver to Ontario, returning Sun, Sep 27, priced at CA $781 found 4 hours ago
Mon, Dec 21 - Fri, Dec 25
DEN
Denver
ONT
Ontario
CA $790 Roundtrip, found 1 day ago
CA $790
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Mon, Dec 21 from Denver to Ontario, returning Fri, Dec 25, priced at CA $790 found 1 day ago

Frequently asked questions

Are there direct flights from DEN to Los Angeles - Ontario Intl. Airport (ONT)?
Begin your getaway in the most stress-free way possible and head straight to Los Angeles - Ontario Intl. Airport (ONT) from DEN. Southwest Airlines and United Airlines are among the airlines that offer direct services on this route.
What airlines fly from Denver Intl. Airport (DEN) to Ontario Airport?
Choose from a number of airlines offering direct flights between Denver and Ontario. Southwest Airlines (WN) is one of the most popular. This carrier offers 86 flights each month. If you want more options, have a look at the deals on offer from United Airlines (UA). This carrier operates 60 flights every month. Between the two, we're sure you'll find a deal to suit your travel needs.
What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.

Explore More Ways to Travel with Travelocity

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.