American Airlines flights from Harlingen to Seattle

Recent searches for flights from Harlingen to Seattle

Aug 2026
From$638*
Updated: 12 hours ago
Round tripIEconomy
Sep 2026
From$317*
Updated: 12 hours ago
Round tripIEconomy
Oct 2026
From$317*
Updated: 12 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $338
cmp-daily-histogram-bars-legend-max-price-aria-label $813
Displaying fares for August-2026
  • HRL–SEA, 08/28/26 – 09/04/26: From $638
    28

    Fr

    AUG

  • HRL–SEA, 08/29/26 – 09/05/26: From $671
    29

    Sa

  • HRL–SEA, 08/30/26 – 09/06/26: From $638
    30

    Su

  • HRL–SEA, 08/31/26 – 09/07/26: From $813
    31

    Mo

  • HRL–SEA, 09/01/26 – 09/08/26: From $573
    01

    Tu

    SEP

  • HRL–SEA, 09/02/26 – 09/09/26: From $573
    02

    We

  • HRL–SEA, 09/03/26 – 09/10/26: From $783
    03

    Th

  • HRL–SEA, 09/04/26 – 09/11/26: From $608
    04

    Fr

  • HRL–SEA, 09/05/26 – 09/12/26: From $618
    05

    Sa

  • HRL–SEA, 09/06/26 – 09/13/26: From $521
    06

    Su

  • HRL–SEA, 09/07/26 – 09/14/26: From $783
    07

    Mo

  • HRL–SEA, 09/08/26 – 09/15/26: From $623
    08

    Tu

  • HRL–SEA, 09/09/26 – 09/16/26: From $407
    09

    We

  • HRL–SEA, 09/10/26 – 09/17/26: From $603
    10

    Th

  • HRL–SEA, 09/11/26 – 09/18/26: From $627
    11

    Fr

  • HRL–SEA, 09/12/26 – 09/19/26: From $573
    12

    Sa

  • HRL–SEA, 09/13/26 – 09/20/26: From $627
    13

    Su

  • HRL–SEA, 09/14/26 – 09/21/26: From $496
    14

    Mo

  • HRL–SEA, 09/15/26 – 09/22/26: From $394
    15

    Tu

  • HRL–SEA, 09/16/26 – 09/23/26: From $394
    16

    We

  • HRL–SEA, 09/17/26 – 09/24/26: From $549
    17

    Th

  • HRL–SEA, 09/18/26 – 09/25/26: From $640
    18

    Fr

  • HRL–SEA, 09/19/26 – 09/26/26: From $534
    19

    Sa

  • HRL–SEA, 09/20/26 – 09/27/26: From $621
    20

    Su

  • HRL–SEA, 09/21/26 – 09/28/26: From $532
    21

    Mo

  • HRL–SEA, 09/22/26 – 09/29/26: From $338
    22

    Tu

  • HRL–SEA, 09/23/26 – 09/30/26: From $444
    23

    We

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

    Th

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

    Fr

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

    Sa

  • HRL–SEA, 09/27/26 – 10/04/26: From $465
    27

    Su

    • range$338-$813

    DisclaimerFares displayed have been collected within the last 24hrs and may no longer be available at time of booking. Modifying this information may result in a different fare. To find the most updated fare, please visit aa.com. Fares listed may be Basic Economy, which class is subject to additional terms and conditions. Additional baggage fees and charges for optional products and services may apply.

    Find deals on Harlingen to Seattle flights

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    Harlingen (HRL)to

    Seattle (SEA)
    10/06/26 - 10/13/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 12 hours ago

    Harlingen (HRL)to

    Seattle (SEA)
    10/13/26 - 10/20/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 12 hours ago

    Harlingen (HRL)to

    Seattle (SEA)
    11/10/26 - 11/17/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 12 hours ago

    Harlingen (HRL)to

    Seattle (SEA)
    10/07/26 - 10/14/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 12 hours ago

    Harlingen (HRL)to

    Seattle (SEA)
    10/27/26 - 11/03/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 12 hours ago

    Harlingen (HRL)to

    Seattle (SEA)
    10/28/26 - 11/04/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 12 hours ago

    Harlingen (HRL)to

    Seattle (SEA)
    11/03/26 - 11/10/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 12 hours ago

    Harlingen (HRL)to

    Seattle (SEA)
    11/04/26 - 11/11/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 12 hours ago

    *Fares displayed have been collected within the last 24hrs and may no longer be available at time of booking. Some fares listed may include one or more connections that are Basic Economy, which class is subject to additional terms and conditions. Modifying this information may result in a different fare. To find the most updated fare, please visit aa.com. Additional baggage fees and charges for optional products and services may apply.

    Finding cheap flights from Harlingen to Seattle

    Looking for lower fares on your trip from Harlingen to Seattle? Here are a few ways to save.

    • Book early: Booking 1 to 3 months ahead can help you find lower fares
    • Be flexible with dates: Midweek travel, like Tuesdays and Wednesdays, can be more affordable
    • Travel during less busy periods: Flying outside peak travel times can help find lower fares and avoid crowds

    Earn up to $500 back on your next American Airlines flight plus, 30,000 bonus miles. Offers vary elsewhere. Opens another site in a new window that may not meet accessibility guidelines.

    Upgrade your flight with Main Cabin Extra

    Make your trip more comfortable with Main Cabin Extra. Enjoy benefits like:

    • Extra legroom: More space with seats at the front of the Main Cabin or in exit rows.
    • Early boarding: Preferred Group 5 boarding allows easier access to overhead bins.
    • Complimentary drinks: Enjoy beer, wine and spirits on flights with full beverage service.

    Discover how Main Cabin Extra can enhance your trip.

    American Airlines flights from Harlingen to Seattle