Search & Compare - Denver to Ontario Flights & Tickets

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    Cheap flights from Denver to Ontario (DEN to ONT)

    Looking for a cheap last-minute deal or the best round-trip flight from Denver to Ontario? Find the biggest savings on one-way and round-trip tickets right here.

    Recent airfare deals on Denver to Ontario

    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-04-23
    Ontario
    USD 30

    One-way F9 Nonstop Economy fare found on 2025-04-02
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-04-23
    Ontario
    USD 30

    One-way F9 Nonstop Economy fare found on 2025-04-02
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-05-03
    Ontario
    2025-05-06
    USD 32

    Round Trip F9 Nonstop Economy fare found on 2025-04-04
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-05-03
    Ontario
    2025-05-06
    USD 32

    Round Trip F9 Nonstop Economy fare found on 2025-04-04
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-03-18
    Ontario
    USD 34

    One-way F9 Nonstop Economy fare found on 2025-03-06
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-03-18
    Ontario
    USD 34

    One-way F9 Nonstop Economy fare found on 2025-03-06
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-03-18
    Ontario
    USD 34

    One-way F9 Nonstop Economy fare found on 2025-03-06
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-03-18
    Ontario
    USD 34

    One-way F9 Nonstop Economy fare found on 2025-03-06
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-03-18
    Ontario
    USD 34

    One-way F9 Nonstop Economy fare found on 2025-03-06
    Frontier Airlines  F9
    Frontier Airlines
    Denver
    2025-03-18
    Ontario
    USD 34

    One-way F9 Nonstop Economy fare found on 2025-03-06


    *Prices are per person and are for e-tickets and include all taxes & fees in USD.
    *Fareleaders always attempts to get accurate pricing, however, prices are not guaranteed.
    *Fareleaders is not seller, we aggregate tones of data for you from other online travel agencies and external sources.

    Facts to know while booking flights from Denver to Ontario

    What are the airports in Denver?
    What’s the most popular airline flying from DEN to ONT?
    Can I fly from DEN to ONT non-stop?
    Which airlines fly nonstop between Denver and Ontario?
    What’s the earliest departure time from DEN to ONT Airport?
    What are the airports in Ontario?
    Can I make changes to my Denver to Ontario flight tickets or cancel them on FareLeaders.com?
    Can I cancel my flight tickets from DEN to ONT?
    Which airline alliances offer flights from Denver and Ontario?
    How long does a flight from Denver to Ontario take?
    Which airlines provide the cheapest flights from Denver (DEN) to Ontario (ONT) ?
    Do I need a passport to fly between DEN and ONT?
    What’s the latest departure time from DEN to ONT ?

    Flights from Denver to Ontario

    Origin AirportDenver International , Denver, US
    Destination AirportOntario International , Ontario, US
    Served by AirlinesSouthwest Airlines, Frontier Airlines, United Airlines
    Lowest PriceFrontier Airlines : USD 30
    Distance819 miles

    Airlines Flying from Denver International

    Popular Routes

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