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Flights from Ontario to Denver
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Book flight tickets from Ontario to Denver starting at NZD 36

For as little as NZD 36, you can take your next adventure to Denver without breaking the bank. Choose between one-way and return tickets from Ontario below.

  • One way
  • Round-trip
      • Cheapest nonstop
        ONT00:59
        2h 23m
        Nonstop
        DEN04:22
        Wed, Jan 1|Ontario - Denver|Frontier Airlines
        NZD 36NZD 52
        31% OFF
        31% OFF
        NZD 52NZD 36

        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 ticket prices start from NZD 36 including taxes and charges.

      • ONT07:45
        2h 18m
        Nonstop
        DEN11:03
        Wed, Dec 4|Ontario - Denver|Frontier Airlines
        NZD 43NZD 52
        16% OFF
        16% OFF
        NZD 52NZD 43

        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 ticket prices start from NZD 43 including taxes and charges.

      • ONT00:59
        2h 23m
        Nonstop
        DEN04:22
        Wed, Dec 25|Ontario - Denver|Frontier Airlines
        NZD 43NZD 52
        16% OFF
        16% OFF
        NZD 52NZD 43

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Wed, Dec 25, arriving at Denver International Airport. One-way ticket prices start from NZD 43 including taxes and charges.

      • ONT07:45
        2h 25m
        Nonstop
        DEN11:10
        Tue, Feb 11|Ontario - Denver|Frontier Airlines
        NZD 43
        NZD 43

        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 ticket prices start from NZD 43 including taxes and charges.

      • ONT07:45
        2h 18m
        Nonstop
        DEN11:03
        Wed, Dec 11|Ontario - Denver|Frontier Airlines
        NZD 44
        NZD 44

        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 ticket prices start from NZD 44 including taxes and charges.

      • ONT07:45
        2h 18m
        Nonstop
        DEN11:03
        Tue, Jan 14|Ontario - Denver|Frontier Airlines
        NZD 44
        NZD 44

        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 ticket prices start from NZD 44 including taxes and charges.

      • ONT07:45
        2h 25m
        Nonstop
        DEN11:10
        Tue, Feb 4|Ontario - Denver|Frontier Airlines
        NZD 44
        NZD 44

        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 ticket prices start from NZD 44 including taxes and charges.

      • ONT00:59
        2h 17m
        Nonstop
        DEN04:16
        Sat, Feb 15|Ontario - Denver|Frontier Airlines
        NZD 45
        NZD 45

        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 ticket prices start from NZD 45 including taxes and charges.

      • ONT00:59
        2h 23m
        Nonstop
        DEN04:22
        Wed, Dec 18|Ontario - Denver|Frontier Airlines
        NZD 45
        NZD 45

        Choose Frontier Airlines flights from Ontario to Denver. The one-way direct flight with Frontier Airlines departs from Ontario International Airport on Wed, Dec 18, arriving at Denver International Airport. One-way ticket prices start from NZD 45 including taxes and charges.

      • ONT07:45
        2h 25m
        Nonstop
        DEN11:10
        Wed, Jan 22|Ontario - Denver|Frontier Airlines
        NZD 46
        NZD 46

        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 ticket prices start from NZD 46 including taxes and charges.

      • ONT13:00
        3h 5m
        Nonstop
        DEN14:00
        Mon, Dec 2|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

These price trend charts carefully monitor and predict how flight prices from Ontario to Denver will change. Keep a close eye on them to understand when the best time to buy your tickets is.

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

Airlines Flying from Ontario to Denver

We have a range of prices from different airlines providing flights from Ontario to Denver. Check below for the journey which best suits your travel needs.

Frontier Airlines
From NZD 36
Alaska Airlines
From NZD 133
United Airlines
From NZD 144
Delta Air Lines
From NZD 148
American Airlines
From NZD 158
Southwest Airlines
From NZD 165

Find more flights and airlines

Alternative Routes from Ontario to Denver

Did you know that you can save money and time on an alternative route from Ontario to Denver? Check out some of the different available routes below.

  • Cheapest
    Frontier Airlines
    ONT
    00:59
    2h 23m
    Nonstop
    DEN
    04:22
    Ontario International Airport - Denver International Airport
    Wed, Jan 1Frontier Airlines
    NZD 36
  • Frontier Airlines
    ONT
    00:59
    2h 23m
    Nonstop
    DEN
    04:22
    Ontario International Airport - Denver International Airport
    Wed, Jan 1Frontier Airlines
    NZD 36
    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 NZD 328.

How to find a cheap flight from Ontario to Denver

If you leave it until the last minute and forget to check some of the key information when booking tickets, prices can often end up skyrocketing. Below, you can find our top tips for getting the best value flights – from changing dates to chasing deals, there are plenty ways to keep your next trip affordable.
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 priceNZD 35
Cheapest round-trip ticket priceNZD 80
Off-season for travelFebruary
Peak season for travelSeptember
Flight distance11,253.64 km
Popular airlineDelta Air Lines

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