Boston (BOS) to Porto (OPO) flights from USD660

*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 Porto

cmp-daily-histogram-bars-legend-min-price-aria-label USD705
cmp-daily-histogram-bars-legend-max-price-aria-label USD1.4K
Displaying fares for September-2026
  • BOS–OPO, 09/13/2026 – 10/04/2026: From USD1,413
    13

    Su

    SEP

  • BOS–OPO, 09/14/2026 – 10/05/2026: From USD1,126
    14

    Mo

  • BOS–OPO, 09/15/2026 – 09/22/2026: From USD1,136
    15

    Tu

  • BOS–OPO, 09/16/2026 – 09/23/2026: From USD1,141
    16

    We

  • BOS–OPO, 09/17/2026 – 09/24/2026: From USD1,095
    17

    Th

  • BOS–OPO, 09/18/2026 – 09/25/2026: From USD1,095
    18

    Fr

  • BOS–OPO, 09/19/2026 – 09/26/2026: From USD1,160
    19

    Sa

  • BOS–OPO, 09/20/2026 – 09/27/2026: From USD795
    20

    Su

  • BOS–OPO, 09/21/2026 – 10/19/2026: From USD735
    21

    Mo

  • BOS–OPO, 09/22/2026 – 10/06/2026: From USD735
    22

    Tu

  • BOS–OPO, 09/23/2026 – 10/21/2026: From USD742
    23

    We

  • BOS–OPO, 09/24/2026 – 10/08/2026: From USD931
    24

    Th

  • BOS–OPO, 09/25/2026 – 09/28/2026: From USD806
    25

    Fr

  • BOS–OPO, 09/26/2026 – 10/10/2026: From USD855
    26

    Sa

  • BOS–OPO, 09/27/2026 – 10/18/2026: From USD795
    27

    Su

  • BOS–OPO, 09/28/2026 – 10/12/2026: From USD735
    28

    Mo

  • BOS–OPO, 09/29/2026 – 10/06/2026: From USD720
    29

    Tu

  • BOS–OPO, 09/30/2026 – 10/21/2026: From USD742
    30

    We

  • BOS–OPO, 10/01/2026 – 10/15/2026: From USD931
    01

    Th

    OCT

  • BOS–OPO, 10/02/2026 – 10/05/2026: From USD936
    02

    Fr

  • BOS–OPO, 10/03/2026 – 10/10/2026: From USD855
    03

    Sa

  • BOS–OPO, 10/04/2026 – 10/18/2026: From USD795
    04

    Su

  • BOS–OPO, 10/05/2026 – 10/19/2026: From USD735
    05

    Mo

  • BOS–OPO, 10/06/2026 – 11/03/2026: From USD705
    06

    Tu

  • BOS–OPO, 10/07/2026 – 11/04/2026: From USD793
    07

    We

  • BOS–OPO, 10/08/2026 – 11/05/2026: From USD1,107
    08

    Th

  • BOS–OPO, 10/09/2026 – 11/06/2026: From USD1,112
    09

    Fr

  • BOS–OPO, 10/10/2026 – 11/07/2026: From USD810
    10

    Sa

  • BOS–OPO, 10/11/2026 – 11/08/2026: From USD740
    11

    Su

  • BOS–OPO, 10/12/2026 – 10/19/2026: From USD720
    12

    Mo

  • RangeUSD705-USD1,413