Cheap Flights from Ontario (ONT) to Denver (DEN)

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

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save on select hotels after you book a flight*
    trophy illustration

    Find the right fit

    We search billions of combinations of flights to help you find your next adventure

Frequently asked questions

How long does it take to fly from Los Angeles - Ontario Intl. Airport (ONT) to Denver Airport?
With Frontier Airlines, a direct flight takes roughly 2 hours and 20 minutes. Step on board the 7:31AM flight from ONT and land at Denver Airport at 10:51AM. Score a superb deal on this and many other routes when you book your ticket with Expedia.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Denver Airport last minute?
When it's time to book your flights, it's always better to be prepared. While it may be possible to pick up a deal on an ONT to Denver Intl. Airport (DEN) flight at the last minute, fares usually don't get cheaper as the date of departure nears. Based on flight pricing and demand studies in 2022, we have found that the sweet spot to book a domestic flight is between 28 – 35 days in advance. For international flights it's between three and four months.
What airports do you fly into for Denver from Ontario?
From Ontario, you can journey to Denver through Denver Intl. Airport (DEN), Centennial Airport (APA) and Broomfield, CO (BJC-Rocky Mountain Metropolitan). Find out which terminal works best for you before making your decision. If you decide on Denver Intl. Airport (DEN), it's approximately 31 kilometers east of the city center. Use the dough you save when booking your airfare with Expedia to discover the city's top attractions, such as Empower Field at Mile High and Coors Field.
What are the most popular departure times for flights from Ontario Airport to Denver Airport?
Between 1:00 PM - 2:00 PM is when you'll find the most United Airlines flights jetting off from Los Angeles - Ontario Intl. Airport (ONT) to DEN. Our useful tip? Leave in the morning. With air traffic yet to build up around airports, your odds of traveling on a delay-free flight are better.
Can I change the date of my flight from ONT to Denver Airport?
Make changes quickly to your Los Angeles - Ontario Intl. Airport (ONT) to Denver Intl. Airport (DEN) ticket through the Expedia Trips portal. But before you make any adjustments, check the conditions and rules in your itinerary to see what the carrier will allow you to do and what charges may apply. Some airlines charge a change fee per person, in addition to any difference in fares. However, if you booked in the last 24 hours, you may be able to cancel for free and organize new flights. You can also head to our Customer Service portal for more useful advice and to chat with our Virtual Agent.

Travel information

Travel information

Origin airport
Los Angeles - Ontario Intl.
Destination airport
Denver Intl.
Distance
1306 km
Average flight time
3 hours 15 mins

Book with confidence

Book with confidence

Explore a world of travel with Expedia

Explore a world of travel with Expedia