American Airlines flights from Seattle to London

Recent searches for flights from Seattle to London

Aug 2026
From$1,032*
Updated: 2 hours ago
Round tripIEconomy
Sep 2026
From$932*
Updated: 9 hours ago
Round tripIEconomy
Oct 2026
From$932*
Updated: 9 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $942
cmp-daily-histogram-bars-legend-max-price-aria-label $1.3K
Displaying fares for August-2026
  • SEA–LHR, 08/20/26 – 08/23/26: From $1,136
    20

    Th

    AUG

  • SEA–LHR, 08/21/26 – 08/28/26: From $1,092
    21

    Fr

  • SEA–LHR, 08/22/26 – 09/08/26: From $1,092
    22

    Sa

  • SEA–LHR, 08/23/26 – 08/30/26: From $1,092
    23

    Su

  • SEA–LHR, 08/24/26 – 08/31/26: From $1,082
    24

    Mo

  • SEA–LHR, 08/25/26 – 09/02/26: From $1,032
    25

    Tu

  • SEA–LHR, 08/26/26 – 09/02/26: From $1,036
    26

    We

  • SEA–LHR, 08/27/26 – 09/03/26: From $1,082
    27

    Th

  • SEA–LHR, 08/28/26 – 09/04/26: From $1,177
    28

    Fr

  • SEA–LHR, 08/29/26 – 09/05/26: From $1,227
    29

    Sa

  • SEA–LHR, 08/30/26 – 09/06/26: From $1,167
    30

    Su

  • SEA–LON, 08/31/26 – 09/07/26: From $1,282
    31

    Mo

  • SEA–LHR, 09/01/26 – 09/08/26: From $1,046
    01

    Tu

    SEP

  • SEA–LHR, 09/02/26 – 09/09/26: From $1,214
    02

    We

  • SEA–LHR, 09/03/26 – 09/10/26: From $1,264
    03

    Th

  • SEA–LON, 09/04/26 – 09/11/26: From $1,176
    04

    Fr

  • SEA–LHR, 09/05/26 – 09/13/26: From $1,096
    05

    Sa

  • SEA–LHR, 09/06/26 – 09/13/26: From $1,265
    06

    Su

  • SEA–LHR, 09/07/26 – 09/14/26: From $1,092
    07

    Mo

  • SEA–LHR, 09/08/26 – 09/15/26: From $1,046
    08

    Tu

  • SEA–LHR, 09/09/26 – 09/16/26: From $1,036
    09

    We

  • SEA–LHR, 09/10/26 – 09/17/26: From $1,082
    10

    Th

  • SEA–LON, 09/11/26 – 09/18/26: From $1,057
    11

    Fr

  • SEA–LHR, 09/12/26 – 09/19/26: From $1,142
    12

    Sa

  • SEA–LHR, 09/13/26 – 09/20/26: From $1,265
    13

    Su

  • SEA–LHR, 09/14/26 – 09/21/26: From $1,052
    14

    Mo

  • SEA–LHR, 09/15/26 – 09/22/26: From $1,032
    15

    Tu

  • SEA–LON, 09/16/26 – 09/23/26: From $942
    16

    We

  • SEA–LHR, 09/17/26 – 09/24/26: From $986
    17

    Th

  • SEA–LHR, 09/18/26 – 09/25/26: From $957
    18

    Fr

  • SEA–LHR, 09/19/26 – 09/26/26: From $1,082
    19

    Sa

    • range$942-$1,282

    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 Seattle to London flights

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    Seattle (SEA)to

    London (LON)
    12/02/26 - 12/09/26

    Round trip

    Economy

    from
    $883Fare subject to changes
    Updated: 15 hours ago

    Seattle (SEA)to

    London (LON)
    12/08/26 - 12/15/26

    Round trip

    Economy

    from
    $883Fare subject to changes
    Updated: 15 hours ago

    Seattle (SEA)to

    London (LON)
    11/17/26 - 11/24/26

    Round trip

    Economy

    from
    $883Fare subject to changes
    Updated: 15 hours ago

    Seattle (SEA)to

    London (LON)
    12/01/26 - 12/08/26

    Round trip

    Economy

    from
    $893Fare subject to changes
    Updated: 15 hours ago

    Seattle (SEA)to

    London (LON)
    11/18/26 - 11/25/26

    Round trip

    Economy

    from
    $893Fare subject to changes
    Updated: 15 hours ago

    Seattle (SEA)to

    London (LON)
    12/09/26 - 12/16/26

    Round trip

    Economy

    from
    $897Fare subject to changes
    Updated: 15 hours ago

    Seattle (SEA)to

    London (LON)
    12/16/26 - 12/23/26

    Round trip

    Economy

    from
    $919Fare subject to changes
    Updated: 15 hours ago

    Seattle (SEA)to

    London (LON)
    11/24/26 - 12/01/26

    Round trip

    Economy

    from
    $925Fare subject to changes
    Updated: 15 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 Seattle to London

    Looking for lower fares on your trip from Seattle to London? 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 Seattle to London