Southwest® flights from Seattle/Tacoma to Boston from $164

Promo Code

Low fares from Seattle/Tacoma to Boston

$

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 09/16/2026

One-way

Basic

From
$164
Seen: 16 hrs ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 09/11/2026

One-way

Basic

From
$174
Seen: 17 hrs ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 10/10/2026

One-way

Basic

From
$179
Seen: 30 minutes ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 09/02/2026

One-way

Basic

From
$179
Seen: 15 hrs ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 08/29/2026

One-way

Basic

From
$179
Seen: 22 hrs ago

Seattle/Tacoma (SEA)to

Boston (BOS)
Depart: 08/27/2026

One-way

Basic

From
$204
Seen: 14 hrs ago

Looking for more low-fare flights?

Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.

Find low fares

Explore flights from Seattle/Tacoma to Boston

Aug 2026
From$179*
Seen: 22 hrs ago
One Way/Basic
Sep 2026
From$164*
Seen: 16 hrs ago
One Way/Basic
Oct 2026
From$179*
Seen: 30 minutes ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $179
cmp-daily-histogram-bars-legend-max-price-aria-label $479
Displaying fares for August-2026
  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    01

    Sat

    AUG

  • SEA–BOS, 08/02/2026: From $479
    02

    Sun

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    03

    Mon

  • SEA–BOS, 08/04/2026: From $359
    04

    Tue

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    05

    Wed

  • SEA–BOS, 08/06/2026: From $359
    06

    Thu

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

    Fri

  • SEA–BOS, 08/08/2026: From $304
    08

    Sat

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

    Sun

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

    Mon

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

    Tue

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

    Wed

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    13

    Thu

  • SEA–BOS, 08/14/2026: From $284
    14

    Fri

  • SEA–BOS, 08/15/2026: From $239
    15

    Sat

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

    Sun

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

    Mon

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

    Tue

  • SEA–BOS, 08/19/2026: From $249
    19

    Wed

  • SEA–BOS, 08/20/2026: From $324
    20

    Thu

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

    Fri

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

    Sat

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    23

    Sun

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

    Mon

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    25

    Tue

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    26

    Wed

  • SEA–BOS, 08/27/2026: From $204
    27

    Thu

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    28

    Fri

  • SEA–BOS, 08/29/2026: From $179
    29

    Sat

  • SEA–BOS, 08/30/2026: From $209
    30

    Sun

  • SEA–BOS: cmp-view-offers-disclaimer. Find Offers
    31

    Mon

    • Range$179-$479

    *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.

    Explore Flights from Other Popular Origins

    Popular Flights from Seattle/Tacoma