Southwest® flights from Seattle/Tacoma to Boston from $187

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Low fares from Seattle/Tacoma to Boston

$

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 10/31/2026

One-way

Basic

From
$187
Seen: 8 hrs ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 11/12/2026

One-way

Basic

From
$199
Seen: 3 hrs ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 10/29/2026

One-way

Basic

From
$199
Seen: 59 minutes ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 11/05/2026

One-way

Basic

From
$204
Seen: 1 hour ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 12/21/2026

One-way

Basic

From
$204
Seen: 17 hrs ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 11/13/2026

One-way

Basic

From
$214
Seen: 16 hrs ago

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Explore flights from Seattle/Tacoma to Boston

Sep 2026
From$394*
Seen: 4 hrs ago
One Way/Basic
Oct 2026
From$187*
Seen: 8 hrs ago
One Way/Basic
Nov 2026
From$199*
Seen: 3 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $227
cmp-daily-histogram-bars-legend-max-price-aria-label $494
Displaying fares for September-2026
  • SEA–BOS, 09/23/2026: From $494
    23

    Wed

    SEP

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    24

    Thu

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    25

    Fri

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    26

    Sat

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    27

    Sun

  • SEA–BOS, 09/28/2026: From $394
    28

    Mon

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    29

    Tue

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    30

    Wed

  • SEA–BOS, 10/01/2026: From $469
    01

    Thu

    OCT

  • SEA–BOS, 10/02/2026: From $309
    02

    Fri

  • SEA–BOS, 10/03/2026: From $309
    03

    Sat

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

    Sun

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    05

    Mon

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    06

    Tue

  • SEA–BOS, 10/07/2026: From $304
    07

    Wed

  • SEA–BOS, 10/08/2026: From $469
    08

    Thu

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    09

    Fri

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

    Sat

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    11

    Sun

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    12

    Mon

  • SEA–BOS, 10/13/2026: From $284
    13

    Tue

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    14

    Wed

  • SEA–BOS, 10/15/2026: From $361
    15

    Thu

  • SEA–BOS, 10/16/2026: From $227
    16

    Fri

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

    Sat

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    18

    Sun

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    19

    Mon

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    20

    Tue

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    21

    Wed

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    22

    Thu

    • Range$227-$494

    *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:
    Seattle/Tacoma International Airport
    Arriving at:
    Logan International Airport
    Distance:
    2496 miles

    Route Information

    64† 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 64 weekly flights from Seattle/Tacoma to Boston on Southwest Airlines.
    To find the lowest fares by day and time to fly Seattle/Tacoma to Boston with Southwest, check out our Low Fare Calendar.
    You can rent a car at Logan International Airport book yours with your flight.
    Yes! Flights from Seattle/Tacoma to Boston—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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