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Cheap DEN to ONT Flights

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Denver to Ontario route information

Origin Airport Denver Intl.
Destination Airport Los Angeles - Ontario Intl.
Airlines Serving Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hahn Air Systems, United
Flight Price $137
Distance 816 mi

San Bernardino


Santa Monica


Orange County


Long Beach


Los Angeles




Cheap DEN to ONT Flights

  • Question : Which airline has the least delays from Denver to Ontario?
    Answer : Booking with Frontier Airlines means you will arrive to Ontario about the time you were supposed to. In fact, this timely airline has an 88% on-time average.
  • Question : How much is a plane ticket to Ontario (ONT) from Denver (DEN)?
    Answer : They vary from $133 to $1,051. Booking in advance can usually help you get the cheapest price. However, usually the sooner you book, the more you'll be able to save.
  • Question : How long is the flight from DEN to ONT?
    Answer : This direct flight will whoosh you away to your destination in two hours and 15 minutes via Southwest Airlines. If you catch the 8:30 PM MDT departure, you'll arrive at 9:45 PM PDT. Giving you plenty of time to freshen up or grab a quick lunch (remember, there is a one-hour time difference).
  • Question : Can I change the date of my flight?
    Answer : You sure can switch your departure date and you may save by changing when you leave. The lowest-cost day to fly in June is Saturday. You might think you're missing out leaving a day early, but we think that you are just adding those savings towards a future holiday.
  • Question : What is the cheapest airline flying from Denver to Ontario?
    Answer : Frontier Airlines strives to keep prices down for travelers over the next three months. Fares are being booked at just $133 and, when compared to the higher priced bookings of $1,051, it's quite a deal.
  • Question : How long does it take to fly from Denver to Ontario?
    Answer : If you're able to take the direct flight (which is offered by Southwest Airlines), you will be able to leave DEN at 8:30 PM MDT and get to ONT at 9:45 PM PDT (two hours and 15 minutes). Remember, there is a time change of one hour.
  • Question : How many flights are there per day from Denver to Ontario?
    Answer : Of course, the day matters, but on average, 13 different flight times exist when you fly from DEN to ONT. That is higher than the national average of nine.

Apr 19, 2019

I thought the baggage fees was horrible 🙁

Mar 18, 2019

No hassle

Nov 18, 2018

We did NOT get free checked bags. Fliers are being stripped of any convenience to fly.

Nov 7, 2018

This airline is fine for short flights. I wouldn’t suggest them for long flights or if you’re looking forward to relaxing on your flight.

Oct 7, 2018

Everyone was very kind and helpful thank u so much.

Oct 5, 2018

a little larger quantity of the snack would be nice

Sep 21, 2018

Everything went well and flights were on time.

Aug 31, 2018

Unhappy with the policy on carryon.

Aug 26, 2018

I liked the separate group lines for boarding.

Aug 20, 2018

Great experience at a terrible time of day.