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

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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 $249 round trip and CA $128 one way. Prices and availability subject to change. Additional terms may apply.

Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $249 Roundtrip, found 14 hours ago
CA $249
Roundtrip
found 14 hours ago
Select Southwest Airlines flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $249 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $293 Roundtrip, found 14 hours ago
CA $293
Roundtrip
found 14 hours ago
Select Southwest Airlines flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $293 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $324 Roundtrip, found 14 hours ago
CA $324
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $324 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $350 Roundtrip, found 14 hours ago
CA $350
Roundtrip
found 14 hours ago
Select Delta flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $350 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $362 Roundtrip, found 14 hours ago
CA $362
Roundtrip
found 14 hours ago
Select Southwest Airlines flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $362 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $368 Roundtrip, found 14 hours ago
CA $368
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $368 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $373 Roundtrip, found 14 hours ago
CA $373
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $373 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $387 Roundtrip, found 14 hours ago
CA $387
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $387 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $390 Roundtrip, found 14 hours ago
CA $390
Roundtrip
found 14 hours ago
Select United flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $390 found 14 hours ago
Sun, Sep 6 - Fri, Sep 11
DEN
Denver
ONT
Ontario
CA $406 Roundtrip, found 14 hours ago
CA $406
Roundtrip
found 14 hours ago
Select Southwest Airlines flight, departing Sun, Sep 6 from Denver to Ontario, returning Fri, Sep 11, priced at CA $406 found 14 hours 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.

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*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.