Southwest® flights from Philadelphia to Seattle/Tacoma from $169

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Low fares from Philadelphia to Seattle/Tacoma

$

Philadelphia (PHL)to

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

One-way

Basic

From
$169
Seen: 8 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 09/08/2026

One-way

Basic

From
$171
Seen: 19 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 10/22/2026

One-way

Basic

From
$174
Seen: 4 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 10/21/2026

One-way

Basic

From
$174
Seen: 4 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 11/06/2026

One-way

Basic

From
$185
Seen: 4 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 09/11/2026

One-way

Basic

From
$185
Seen: 8 hrs ago

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Explore flights from Philadelphia to Seattle/Tacoma

Aug 2026
From$208*
Seen: 10 hrs ago
One Way/Basic
Sep 2026
From$169*
Seen: 8 hrs ago
One Way/Basic
Oct 2026
From$174*
Seen: 4 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $169
cmp-daily-histogram-bars-legend-max-price-aria-label $281
Displaying fares for August-2026
  • PHL–SEA, 08/22/2026: From $208
    22

    Sat

    AUG

  • PHL–SEA, 08/23/2026: From $281
    23

    Sun

  • PHL–SEA, 08/24/2026: From $281
    24

    Mon

  • PHL–SEA, 08/25/2026: From $208
    25

    Tue

  • PHL–SEA, 08/26/2026: From $208
    26

    Wed

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

    Thu

  • PHL–SEA, 08/28/2026: From $281
    28

    Fri

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    29

    Sat

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    30

    Sun

  • PHL–SEA, 08/31/2026: From $281
    31

    Mon

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

    Tue

    SEP

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    02

    Wed

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    03

    Thu

  • PHL–SEA, 09/04/2026: From $281
    04

    Fri

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    05

    Sat

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    06

    Sun

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    07

    Mon

  • PHL–SEA, 09/08/2026: From $171
    08

    Tue

  • PHL–SEA, 09/09/2026: From $190
    09

    Wed

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

    Thu

  • PHL–SEA, 09/11/2026: From $185
    11

    Fri

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    12

    Sat

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    13

    Sun

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    14

    Mon

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    15

    Tue

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    16

    Wed

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    17

    Thu

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    18

    Fri

  • PHL–SEA, 09/19/2026: From $169
    19

    Sat

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    20

    Sun

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

    Mon

    • Range$169-$281

    *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:
    Philadelphia International Airport
    Arriving at:
    Seattle/Tacoma International Airport
    Distance:
    2378 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 Philadelphia to Seattle/Tacoma on Southwest Airlines.
    To find the lowest fares by day and time to fly Philadelphia 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 Philadelphia 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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