Southwest® flights from Philadelphia to Seattle/Tacoma from $136

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Low fares from Philadelphia to Seattle/Tacoma

$

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 01/09/2027

One-way

Basic

From
$136
Seen: 19 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 01/28/2027

One-way

Basic

From
$136
Seen: 2 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 01/07/2027

One-way

Basic

From
$136
Seen: 7 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 11/10/2026

One-way

Basic

From
$156
Seen: 17 hrs ago

Philadelphia (PHL)to

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

One-way

Basic

From
$160
Seen: 6 hrs ago

Philadelphia (PHL)to

Seattle/Tacoma (SEA)
Depart: 12/11/2026

One-way

Basic

From
$160
Seen: 17 hrs ago

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Explore flights from Philadelphia to Seattle/Tacoma

Oct 2026
From$248*
Seen: 11 hrs ago
One Way/Basic
Nov 2026
From$156*
Seen: 17 hrs ago
One Way/Basic
Dec 2026
From$160*
Seen: 17 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $156
cmp-daily-histogram-bars-legend-max-price-aria-label $383
Displaying fares for October-2026
  • PHL–SEA, 10/22/2026: From $311
    22

    Thu

    OCT

  • PHL–SEA, 10/23/2026: From $311
    23

    Fri

  • PHL–SEA, 10/24/2026: From $248
    24

    Sat

  • PHL–SEA, 10/25/2026: From $336
    25

    Sun

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    26

    Mon

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    27

    Tue

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    28

    Wed

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    29

    Thu

  • PHL–SEA, 10/30/2026: From $311
    30

    Fri

  • PHL–SEA, 10/31/2026: From $248
    31

    Sat

  • PHL–SEA, 11/01/2026: From $383
    01

    Sun

    NOV

  • PHL–SEA: cmp-view-offers-disclaimer. Find Offers
    02

    Mon

  • PHL–SEA, 11/03/2026: From $248
    03

    Tue

  • PHL–SEA, 11/04/2026: From $248
    04

    Wed

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    05

    Thu

  • PHL–SEA, 11/06/2026: From $311
    06

    Fri

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    07

    Sat

  • PHL–SEA: cmp-view-offers-disclaimer. Find Offers
    08

    Sun

  • PHL–SEA, 11/09/2026: From $160
    09

    Mon

  • PHL–SEA, 11/10/2026: From $156
    10

    Tue

  • PHL–SEA, 11/11/2026: From $162
    11

    Wed

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    12

    Thu

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    13

    Fri

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    14

    Sat

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    15

    Sun

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    16

    Mon

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    17

    Tue

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    18

    Wed

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    19

    Thu

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    20

    Fri

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

    Sat

    • Range$156-$383

    *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

    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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