Flights from Saint Louis (STL) to Seattle (SEA) on Alaska Airlines

Lowest fares from Saint Louis to Seattle

Nov 2026
From$314*
Seen: 18 hours ago
Flight Type One Way|Saver
Dec 2026
From$239*
Seen: 18 hours ago
Flight Type One Way|Saver
Jan 2027
From$239*
Seen: 18 hours ago
Flight Type One Way|Saver
cmp-daily-histogram-bars-legend-min-price-aria-label $239
cmp-daily-histogram-bars-legend-max-price-aria-label $1.0K
Displaying fares for November-2026
  • STL–SEA, Nov 11, 2026: From $314
    11

    We

    NOV

  • STL–SEA, Nov 12, 2026: From $449
    12

    Th

  • STL–SEA, Nov 13, 2026: From $449
    13

    Fr

  • STL–SEA, Nov 14, 2026: From $449
    14

    Sa

  • STL–SEA, Nov 15, 2026: From $449
    15

    Su

  • STL–SEA, Nov 16, 2026: From $384
    16

    Mo

  • STL–SEA, Nov 17, 2026: From $384
    17

    Tu

  • STL–SEA, Nov 18, 2026: From $384
    18

    We

  • STL–SEA, Nov 19, 2026: From $384
    19

    Th

  • STL–SEA, Nov 20, 2026: From $384
    20

    Fr

  • STL–SEA, Nov 21, 2026: From $384
    21

    Sa

  • STL–SEA, Nov 22, 2026: From $384
    22

    Su

  • STL–SEA, Nov 23, 2026: From $324
    23

    Mo

  • STL–SEA, Nov 24, 2026: From $324
    24

    Tu

  • STL–SEA, Nov 25, 2026: From $324
    25

    We

  • STL–SEA, Nov 26, 2026: From $324
    26

    Th

  • STL–SEA, Nov 27, 2026: From $384
    27

    Fr

  • STL–SEA, Nov 28, 2026: From $579
    28

    Sa

  • STL–SEA, Nov 29, 2026: From $1,016
    29

    Su

  • STL–SEA, Nov 30, 2026: From $509
    30

    Mo

  • STL–SEA, Dec 1, 2026: From $384
    01

    Tu

    DEC

  • STL–SEA, Dec 2, 2026: From $279
    02

    We

  • STL–SEA, Dec 3, 2026: From $239
    03

    Th

  • STL–SEA, Dec 4, 2026: From $239
    04

    Fr

  • STL–SEA, Dec 5, 2026: From $239
    05

    Sa

  • STL–SEA, Dec 6, 2026: From $239
    06

    Su

  • STL–SEA, Dec 7, 2026: From $239
    07

    Mo

  • STL–SEA, Dec 8, 2026: From $239
    08

    Tu

  • STL–SEA, Dec 9, 2026: From $239
    09

    We

  • STL–SEA, Dec 10, 2026: From $239
    10

    Th

    • Range$239-$1,016

    *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 Saint Louis to Seattle.*

    $
    keyboard_arrow_down
    One-way low-fare flights Saint Louis to Seattle.*
    From
    To
    Fare Type
    Dates
    Price
    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Dec 14, 2026

    From

    $239

    Seen: 18 hours ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Dec 18, 2026

    From

    $239

    Seen: 18 hours ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Jan 7, 2027

    From

    $239

    Seen: 18 hours ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Jan 13, 2027

    From

    $239

    Seen: 18 hours ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Jan 14, 2027

    From

    $239

    Seen: 18 hours ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Jan 18, 2027

    From

    $239

    Seen: 18 hours ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Jan 21, 2027

    From

    $239

    Seen: 18 hours ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Jan 22, 2027

    From

    $239

    Seen: 18 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.

    Frequently Asked Questions on flights from Saint Louis (STL) to Seattle (SEA)

    When is the best time to book a flight from Saint Louis to Seattle?

    Want to find the lowest fares by day and time flying from Saint Louis to Seattle on Alaska Airlines or Hawaiian Airlines? Check out our flight search widget.

    Can I earn points on my flight to Seattle?

    Yes, with Atmosâ„¢ Rewards you can earn points on flights to 1000+ destinations worldwide through the growing network of Alaska and Hawaiian Airlines. Not an Atmosâ„¢ Rewards member yet? Learn more and join today.

    Can I rent a car when I arrive at Seattle/Tacoma International Airport?

    Yes, you can rent a car at Seattle/Tacoma International Airport. Check availability and book now

    Where can I find the status of my flight to Seattle?

    You can check the status of your upcoming Alaska Airlines flight on our flight schedule page.

    Where can I find answers to questions about flying with Alaska Airlines?

    Visit the Alaska Airlines Help Center to quickly browse our help pages by category to find the information you need.

    Can I change or cancel my Alaska Airlines flight to Seattle?

    Yes, you can review, modify, or cancel a reservation from our Manage Your Reservation tool. You can learn more about our policy for changing or cancelling a reservation here. 

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