Alaska Airlines Flights from Portland to Saint Louis

Lowest fares from Portland to Saint Louis

Mar 2026
From$174*
Seen: 13 hours ago
Flight Type One Way|Saver
Apr 2026
From$109*
Seen: 13 hours ago
Flight Type One Way|Saver
May 2026
From$99*
Seen: 13 hours ago
Flight Type One Way|Saver
$129
$734
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    • Range$129-$734

    *Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

    One-way low-fare flights Portland to Saint Louis.*

    $
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    One-way low-fare flights Portland to Saint Louis.*
    From
    To
    Fare Type
    Dates
    Price
    Portland (PDX)Saint Louis (STL)One-way
    |
    Saver    		Depart: May 20, 2026

    From

    $99

    Seen: 13 hours ago

    Portland (PDX)Saint Louis (STL)One-way
    |
    Saver    		Depart: May 16, 2026

    From

    $99

    Seen: 32 minutes ago

    Portland (PDX)Saint Louis (STL)One-way
    |
    Saver    		Depart: May 19, 2026

    From

    $99

    Seen: 9 hours ago

    Portland (PDX)Saint Louis (STL)One-way
    |
    Saver    		Depart: Apr 29, 2026

    From

    $109

    Seen: 13 hours ago

    Portland (PDX)Saint Louis (STL)One-way
    |
    Saver    		Depart: May 18, 2026

    From

    $119

    Seen: 13 hours ago

    Portland (PDX)Saint Louis (STL)One-way
    |
    Saver    		Depart: May 15, 2026

    From

    $119

    Seen: 1 hour ago

    Portland (PDX)Saint Louis (STL)One-way
    |
    Saver    		Depart: Apr 8, 2026

    From

    $129

    Seen: 13 hours ago

    Portland (PDX)Saint Louis (STL)One-way
    |
    Saver    		Depart: Apr 28, 2026

    From

    $129

    Seen: 13 hours ago

    *Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

    Explore Alaska Airlines's Flights to Top-Pick Destinations