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Flights from Ontario to Denver
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Flights from Ontario to Denver Starting at €18

We've found these cheap flights for you. You can book one-way or return flight tickets.

  • One way
  • Round-trip
      • Cheapest nonstop
        ONT07:45
        2h 25m
        Nonstop
        DEN11:10
        Tue, Jan 28|Ontario - Denver|Frontier Airlines
        €18€30
        42% OFF
        42% OFF
        €30€18

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Tue, Jan 28, arriving at Denver International Airport. One-way Prices start from €18 including taxes and charges.

      • ONT00:59
        2h 23m
        Nonstop
        DEN04:22
        Wed, Jan 1|Ontario - Denver|Frontier Airlines
        €20€30
        34% OFF
        34% OFF
        €30€20

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Wed, Jan 1, arriving at Denver International Airport. One-way Prices start from €20 including taxes and charges.

      • ONT07:45
        2h 18m
        Nonstop
        DEN11:03
        Wed, Dec 11|Ontario - Denver|Frontier Airlines
        €25€30
        19% OFF
        19% OFF
        €30€25

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Wed, Dec 11, arriving at Denver International Airport. One-way Prices start from €25 including taxes and charges.

      • ONT07:45
        2h 18m
        Nonstop
        DEN11:03
        Wed, Dec 4|Ontario - Denver|Frontier Airlines
        €25
        €25

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Wed, Dec 4, arriving at Denver International Airport. One-way Prices start from €25 including taxes and charges.

      • ONT07:45
        2h 25m
        Nonstop
        DEN11:10
        Wed, Jan 22|Ontario - Denver|Frontier Airlines
        €25
        €25

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Wed, Jan 22, arriving at Denver International Airport. One-way Prices start from €25 including taxes and charges.

      • ONT07:45
        2h 18m
        Nonstop
        DEN11:03
        Tue, Jan 14|Ontario - Denver|Frontier Airlines
        €25
        €25

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Tue, Jan 14, arriving at Denver International Airport. One-way Prices start from €25 including taxes and charges.

      • ONT07:45
        2h 25m
        Nonstop
        DEN11:10
        Tue, Feb 11|Ontario - Denver|Frontier Airlines
        €25
        €25

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Tue, Feb 11, arriving at Denver International Airport. One-way Prices start from €25 including taxes and charges.

      • ONT07:45
        2h 25m
        Nonstop
        DEN11:10
        Tue, Feb 4|Ontario - Denver|Frontier Airlines
        €25
        €25

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Tue, Feb 4, arriving at Denver International Airport. One-way Prices start from €25 including taxes and charges.

      • ONT00:59
        2h 17m
        Nonstop
        DEN04:16
        Sat, Feb 15|Ontario - Denver|Frontier Airlines
        €25
        €25

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Sat, Feb 15, arriving at Denver International Airport. One-way Prices start from €25 including taxes and charges.

      • ONT07:45
        2h 25m
        Nonstop
        DEN11:10
        Wed, Jan 8|Ontario - Denver|Frontier Airlines
        €26
        €26

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Wed, Jan 8, arriving at Denver International Airport. One-way Prices start from €26 including taxes and charges.

      • ONT13:00
        3h 5m
        Nonstop
        DEN14:00
        Fri, Nov 29|Ontario - Denver|Frontier Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Find the best time to fly from Ontario to Denver

We monitor flight fares to help you find the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Airlines Flying from Ontario to Denver

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines
From €18
United Airlines
From €74
Alaska Airlines
From €74
Delta Air Lines
From €77
American Airlines
From €88
Southwest Airlines
From €92

Find more flights and airlines

Alternative Routes from Ontario to Denver

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from Ontario to Denver.

  • Cheapest
    Frontier Airlines
    ONT
    07:45
    2h 25m
    Nonstop
    DEN
    11:10
    Ontario International Airport - Denver International Airport
    Tue, Jan 28Frontier Airlines
    €18
  • Frontier Airlines
    ONT
    07:45
    2h 25m
    Nonstop
    DEN
    11:10
    Ontario International Airport - Denver International Airport
    Tue, Jan 28Frontier Airlines
    €18
    Find More Flights

FAQ

  • When are flight tickets from Ontario (ONT) to Denver (DEN) the cheapest?

    Airlines adjust prices for flights from Ontario to Denver based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much do flights from Ontario (ONT) to Denver (DEN) cost?

    According to Trip.com's data, the lowest price is around €183.

How to find a cheap flight from Ontario to Denver

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Ontario to Denver. Book your flights at the right time and save more.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

Flight Information from Ontario to Denver

Cheapest nonstop flight price€17
Cheapest round-trip ticket price€45
Off-season for travelFebruary
Peak season for travelSeptember
Flight distance11,253.64 km
Popular airlineFrontier Airlines

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