Seattle (SEA) to Belfast (BHD) flights from USD929

*Modifying this information may result in a different fare

*All amounts are in USD. Taxes and surcharges are included. No booking fee is applicable. Fares displayed have been collected within the last 48hrs and may no longer be available at time of booking. Additional baggage fees may apply.

Why book directly on the KLM website?

Explore the benefits of booking through our website.

No hidden costs icon

No hidden costs

Book with confidence. Our rates hide no unpleasant surprises.

24/7 customer service icon

24/7 customer service

Count on direct, personal support whenever you need it, day or night.

Seamless travel icon

Seamless travel

Enjoy a smooth journey with timely updates and automatic rebooking.

Lowest fares between Seattle and Belfast

cmp-daily-histogram-bars-legend-min-price-aria-label USD989
cmp-daily-histogram-bars-legend-max-price-aria-label USD1.5K
Displaying fares for September-2026
  • SEA–BHD, 09/02/2026 – 09/09/2026: From USD1,083
    02

    We

    SEP

  • SEA–BHD, 09/03/2026 – 09/17/2026: From USD1,495
    03

    Th

  • SEA–BHD, 09/04/2026 – 09/25/2026: From USD1,295
    04

    Fr

  • SEA–BHD, 09/05/2026 – 10/03/2026: From USD1,183
    05

    Sa

  • SEA–BHD, 09/06/2026 – 09/13/2026: From USD1,133
    06

    Su

  • SEA–BHD, 09/07/2026 – 09/21/2026: From USD1,083
    07

    Mo

  • SEA–BHD, 09/08/2026 – 09/15/2026: From USD1,083
    08

    Tu

  • SEA–BHD, 09/09/2026 – 09/16/2026: From USD1,083
    09

    We

  • SEA–BHD, 09/10/2026 – 10/01/2026: From USD1,133
    10

    Th

  • SEA–BHD, 09/11/2026 – 09/25/2026: From USD1,385
    11

    Fr

  • SEA–BHD, 09/12/2026 – 10/03/2026: From USD1,310
    12

    Sa

  • SEA–BHD, 09/13/2026 – 10/04/2026: From USD1,385
    13

    Su

  • SEA–BHD, 09/14/2026 – 10/12/2026: From USD1,079
    14

    Mo

  • SEA–BHD, 09/15/2026 – 09/22/2026: From USD1,079
    15

    Tu

  • SEA–BHD, 09/16/2026 – 09/23/2026: From USD1,079
    16

    We

  • SEA–BHD, 09/17/2026 – 09/24/2026: From USD1,129
    17

    Th

  • SEA–BHD, 09/18/2026 – 09/21/2026: From USD1,491
    18

    Fr

  • SEA–BHD, 09/19/2026 – 10/03/2026: From USD1,183
    19

    Sa

  • SEA–BHD, 09/20/2026 – 10/18/2026: From USD1,129
    20

    Su

  • SEA–BHD, 09/21/2026 – 10/12/2026: From USD1,206
    21

    Mo

  • SEA–BHD, 09/22/2026 – 09/29/2026: From USD1,079
    22

    Tu

  • SEA–BHD, 09/23/2026 – 09/30/2026: From USD1,079
    23

    We

  • SEA–BHD, 09/24/2026 – 10/15/2026: From USD1,129
    24

    Th

  • SEA–BHD, 09/25/2026 – 09/28/2026: From USD1,129
    25

    Fr

  • SEA–BHD, 09/26/2026 – 10/03/2026: From USD1,089
    26

    Sa

  • SEA–BHD, 09/27/2026 – 10/04/2026: From USD1,039
    27

    Su

  • SEA–BHD, 09/28/2026 – 10/12/2026: From USD989
    28

    Mo

  • SEA–BHD, 09/29/2026 – 10/13/2026: From USD989
    29

    Tu

  • SEA–BHD, 09/30/2026 – 10/07/2026: From USD993
    30

    We

  • SEA–BHD, 10/01/2026 – 10/29/2026: From USD1,125
    01

    Th

    OCT

  • RangeUSD989-USD1,495