Flights from Ontario to Great Falls from $ 330*

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Changed bag rules and optional services         Cruise Packages

Featured daily fares for flights from Ontario (ONT) to Great Falls (GTF)

May 2026
From$ 520*
Viewed: 23 hours ago
RoundTrip|Economy
Jun 2026
From$ 359*
Viewed: 23 hours ago
RoundTrip|Economy
Jul 2026
From$ 384*
Viewed: 23 hours ago
RoundTrip|Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $ 359
cmp-daily-histogram-bars-legend-max-price-aria-label $ 749
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    • Range$ 359-$ 749

    *Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply. Schedules are subject to change without notice.

    More United deals on Ontario (ONT) to Great Falls (GTF) flights

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    More United deals on Ontario (ONT) to Great Falls (GTF) flights
    From
    To
    Fare Type
    Dates
    Price
    Ontario (ONT)Great Falls (GTF)Roundtrip
    |
    Economy    		08/25/26 - 09/01/26

    from

    $ 330

    Viewed: 23 hours ago

    Ontario (ONT)Great Falls (GTF)Roundtrip
    |
    Economy    		08/12/26 - 08/19/26

    from

    $ 330

    Viewed: 23 hours ago

    Ontario (ONT)Great Falls (GTF)Roundtrip
    |
    Economy    		06/13/26 - 06/20/26

    from

    $ 359

    Viewed: 23 hours ago

    Ontario (ONT)Great Falls (GTF)Roundtrip
    |
    Economy    		08/22/26 - 08/25/26

    from

    $ 364

    Viewed: 23 hours ago

    Ontario (ONT)Great Falls (GTF)Roundtrip
    |
    Economy    		08/19/26 - 08/26/26

    from

    $ 364

    Viewed: 23 hours ago

    Ontario (ONT)Great Falls (GTF)Roundtrip
    |
    Economy    		08/26/26 - 09/02/26

    from

    $ 364

    Viewed: 23 hours ago

    Ontario (ONT)Great Falls (GTF)Roundtrip
    |
    Economy    		08/19/26 - 08/22/26

    from

    $ 366

    Viewed: 23 hours ago

    Ontario (ONT)Great Falls (GTF)Roundtrip
    |
    Economy    		08/19/26 - 08/23/26

    from

    $ 370

    Viewed: 23 hours ago

    *Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply. Schedules are subject to change without notice.

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