Southwest® flights from Boise to Seattle/Tacoma from $114

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Low fares from Boise to Seattle/Tacoma

$

Boise (BOI)to

Seattle/Tacoma (SEA)
Depart: 09/19/2026

One-way

Basic

From
$114
Seen: 22 hrs ago

Boise (BOI)to

Seattle/Tacoma (SEA)
Depart: 09/12/2026

One-way

Basic

From
$114
Seen: 20 hrs ago

Boise (BOI)to

Seattle/Tacoma (SEA)
Depart: 10/10/2026

One-way

Basic

From
$114
Seen: 6 hrs ago

Boise (BOI)to

Seattle/Tacoma (SEA)
Depart: 09/30/2026

One-way

Basic

From
$114
Seen: 8 hrs ago

Boise (BOI)to

Seattle/Tacoma (SEA)
Depart: 10/28/2026

One-way

Basic

From
$114
Seen: 13 hrs ago

Boise (BOI)to

Seattle/Tacoma (SEA)
Depart: 10/03/2026

One-way

Basic

From
$114
Seen: 4 hrs ago

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Explore flights from Boise to Seattle/Tacoma

Aug 2026
From$147*
Seen: 5 hrs ago
One Way/Basic
Sep 2026
From$114*
Seen: 8 hrs ago
One Way/Basic
Oct 2026
From$114*
Seen: 4 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $114
cmp-daily-histogram-bars-legend-max-price-aria-label $312
Displaying fares for August-2026
  • BOI–SEA, 08/13/2026: From $266
    13

    Thu

    AUG

  • BOI–SEA, 08/14/2026: From $312
    14

    Fri

  • BOI–SEA, 08/15/2026: From $266
    15

    Sat

  • BOI–SEA: cmp-view-offers-disclaimer. Find Offers
    16

    Sun

  • BOI–SEA: cmp-view-offers-disclaimer. Find Offers
    17

    Mon

  • BOI–SEA, 08/18/2026: From $259
    18

    Tue

  • BOI–SEA, 08/19/2026: From $259
    19

    Wed

  • BOI–SEA, 08/20/2026: From $259
    20

    Thu

  • BOI–SEA, 08/21/2026: From $259
    21

    Fri

  • BOI–SEA, 08/22/2026: From $259
    22

    Sat

  • BOI–SEA, 08/23/2026: From $259
    23

    Sun

  • BOI–SEA, 08/24/2026: From $269
    24

    Mon

  • BOI–SEA, 08/25/2026: From $201
    25

    Tue

  • BOI–SEA, 08/26/2026: From $201
    26

    Wed

  • BOI–SEA, 08/27/2026: From $201
    27

    Thu

  • BOI–SEA, 08/28/2026: From $201
    28

    Fri

  • BOI–SEA, 08/29/2026: From $201
    29

    Sat

  • BOI–SEA, 08/30/2026: From $201
    30

    Sun

  • BOI–SEA, 08/31/2026: From $147
    31

    Mon

  • BOI–SEA: cmp-view-offers-disclaimer. Find Offers
    01

    Tue

    SEP

  • BOI–SEA, 09/02/2026: From $120
    02

    Wed

  • BOI–SEA, 09/03/2026: From $234
    03

    Thu

  • BOI–SEA: cmp-view-offers-disclaimer. Find Offers
    04

    Fri

  • BOI–SEA, 09/05/2026: From $164
    05

    Sat

  • BOI–SEA, 09/06/2026: From $164
    06

    Sun

  • BOI–SEA: cmp-view-offers-disclaimer. Find Offers
    07

    Mon

  • BOI–SEA, 09/08/2026: From $189
    08

    Tue

  • BOI–SEA, 09/09/2026: From $114
    09

    Wed

  • BOI–SEA: cmp-view-offers-disclaimer. Find Offers
    10

    Thu

  • BOI–SEA, 09/11/2026: From $124
    11

    Fri

  • BOI–SEA, 09/12/2026: From $114
    12

    Sat

    • Range$114-$312

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Boise Airport
    Arriving at:
    Seattle/Tacoma International Airport
    Distance:
    399 miles

    Route Information

    124† Weekly flights

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    Questions we hear the most

    There are 124 weekly flights from Boise to Seattle/Tacoma on Southwest Airlines.
    To find the lowest fares by day and time to fly Boise to Seattle/Tacoma with Southwest, check out our Low Fare Calendar.
    You can rent a car at Seattle/Tacoma International Airport book yours with your flight.
    Yes! Flights from Boise to Seattle/Tacoma—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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