Southwest® flights from Seattle/Tacoma to Washington, D.C. (Reagan National) from $153

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Low fares from Seattle/Tacoma to Washington, D.C. (Reagan National)

$

Seattle/Tacoma (SEA)to

Washington, D.C. (Reagan National) (DCA)
Depart: 09/23/2026

One-way

Basic

From
$153
Seen: 17 hrs ago

Seattle/Tacoma (SEA)to

Washington, D.C. (Reagan National) (DCA)
Depart: 08/28/2026

One-way

Basic

From
$153
Seen: 13 hrs ago

Seattle/Tacoma (SEA)to

Washington, D.C. (Reagan National) (DCA)
Depart: 09/09/2026

One-way

Basic

From
$153
Seen: 43 minutes ago

Seattle/Tacoma (SEA)to

Washington, D.C. (Reagan National) (DCA)
Depart: 09/28/2026

One-way

Basic

From
$153
Seen: 17 hrs ago

Seattle/Tacoma (SEA)to

Washington, D.C. (Reagan National) (DCA)
Depart: 09/04/2026

One-way

Basic

From
$158
Seen: 17 hrs ago

Seattle/Tacoma (SEA)to

Washington, D.C. (Reagan National) (DCA)
Depart: 10/04/2026

One-way

Basic

From
$189
Seen: 13 hrs ago

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Explore flights from Seattle/Tacoma to Washington, D.C. (Reagan National)

Aug 2026
From$153*
Seen: 13 hrs ago
One Way/Basic
Sep 2026
From$153*
Seen: 43 minutes ago
One Way/Basic
Oct 2026
From$189*
Seen: 13 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $153
cmp-daily-histogram-bars-legend-max-price-aria-label $569
Displaying fares for August-2026
  • SEA–DCA, 08/02/2026: From $569
    02

    Sun

    AUG

  • SEA–DCA, 08/03/2026: From $569
    03

    Mon

  • SEA–DCA, 08/04/2026: From $569
    04

    Tue

  • SEA–DCA, 08/05/2026: From $569
    05

    Wed

  • SEA–DCA, 08/06/2026: From $569
    06

    Thu

  • SEA–DCA, 08/07/2026: From $444
    07

    Fri

  • SEA–DCA, 08/08/2026: From $444
    08

    Sat

  • SEA–DCA, 08/09/2026: From $469
    09

    Sun

  • SEA–DCA, 08/10/2026: From $444
    10

    Mon

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

    Tue

  • SEA–DCA, 08/12/2026: From $444
    12

    Wed

  • SEA–DCA, 08/13/2026: From $444
    13

    Thu

  • SEA–DCA, 08/14/2026: From $444
    14

    Fri

  • SEA–DCA: cmp-view-offers-disclaimer. Find Offers
    15

    Sat

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

    Sun

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

    Mon

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

    Tue

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

    Wed

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

    Thu

  • SEA–DCA, 08/21/2026: From $223
    21

    Fri

  • SEA–DCA, 08/22/2026: From $223
    22

    Sat

  • SEA–DCA, 08/23/2026: From $294
    23

    Sun

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

    Mon

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

    Tue

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

    Wed

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

    Thu

  • SEA–DCA, 08/28/2026: From $153
    28

    Fri

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

    Sat

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

    Sun

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

    Mon

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

    Tue

    SEP

    • Range$153-$569

    *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:
    Ronald Reagan National Airport
    Distance:
    2329 miles

    Route Information

    58† 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 58 weekly flights from Seattle/Tacoma to Washington, D.C. (Reagan National) on Southwest Airlines.
    To find the lowest fares by day and time to fly Seattle/Tacoma to Washington, D.C. (Reagan National) with Southwest, check out our Low Fare Calendar.
    You can rent a car at Ronald Reagan National Airport book yours with your flight.
    Yes! Flights from Seattle/Tacoma to Washington, D.C. (Reagan National)—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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