Boston (BOS) to Barcelona (BCN) flights from USD631

*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 Boston and Barcelona

cmp-daily-histogram-bars-legend-min-price-aria-label USD631
cmp-daily-histogram-bars-legend-max-price-aria-label USD971
Displaying fares for September-2026
  • BOS–BCN, 09/29/2026 – 10/06/2026: From USD971
    29

    Tu

    SEP

  • BOS–BCN, 09/30/2026 – 10/07/2026: From USD661
    30

    We

  • BOS–BCN, 10/01/2026 – 10/08/2026: From USD636
    01

    Th

    OCT

  • BOS–BCN, 10/02/2026 – 10/09/2026: From USD631
    02

    Fr

  • BOS–BCN, 10/03/2026 – 10/10/2026: From USD631
    03

    Sa

  • BOS–BCN, 10/04/2026 – 10/11/2026: From USD658
    04

    Su

  • BOS–BCN, 10/05/2026 – 10/19/2026: From USD658
    05

    Mo

  • BOS–BCN, 10/06/2026 – 10/13/2026: From USD658
    06

    Tu

  • BOS–BCN, 10/07/2026 – 10/14/2026: From USD661
    07

    We

  • BOS–BCN, 10/08/2026 – 10/15/2026: From USD931
    08

    Th

  • BOS–BCN, 10/09/2026 – 10/16/2026: From USD756
    09

    Fr

  • BOS–BCN, 10/10/2026 – 11/07/2026: From USD641
    10

    Sa

  • BOS–BCN, 10/11/2026 – 11/08/2026: From USD658
    11

    Su

  • BOS–BCN, 10/12/2026 – 10/19/2026: From USD658
    12

    Mo

  • BOS–BCN, 10/13/2026 – 10/16/2026: From USD632
    13

    Tu

  • BOS–BCN, 10/14/2026 – 10/21/2026: From USD676
    14

    We

  • BOS–BCN, 10/15/2026 – 10/22/2026: From USD650
    15

    Th

  • BOS–BCN, 10/16/2026 – 11/06/2026: From USD660
    16

    Fr

  • BOS–BCN, 10/17/2026 – 11/07/2026: From USD641
    17

    Sa

  • BOS–BCN, 10/18/2026 – 11/08/2026: From USD658
    18

    Su

  • BOS–BCN, 10/19/2026 – 10/22/2026: From USD632
    19

    Mo

  • BOS–BCN, 10/20/2026 – 11/17/2026: From USD641
    20

    Tu

  • BOS–BCN, 10/21/2026 – 11/11/2026: From USD658
    21

    We

  • BOS–BCN, 10/22/2026 – 11/19/2026: From USD688
    22

    Th

  • BOS–BCN, 10/23/2026 – 11/13/2026: From USD671
    23

    Fr

  • BOS–BCN, 10/24/2026 – 11/14/2026: From USD660
    24

    Sa

  • BOS–BCN, 10/25/2026 – 11/22/2026: From USD671
    25

    Su

  • BOS–BCN, 10/26/2026 – 11/16/2026: From USD660
    26

    Mo

  • BOS–BCN, 10/27/2026 – 11/17/2026: From USD660
    27

    Tu

  • BOS–BCN, 10/28/2026 – 11/11/2026: From USD688
    28

    We

  • RangeUSD631-USD971