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Flights from Boston to Bilbao

Search cheap flights from Boston to Bilbao in the next 3 months. Based on Trip.com's latest 7-day data, one-way fares start at US$322, and round-trip tickets start at US$386.

      • BOS 22:50
        17h 20m
        1 stop
        BIO 22:10
        Boston - Bilbao | Wed, May 13 | Iberia
        BIO 15:30
        11h 35m
        1 stop
        BOS 21:05
        Bilbao - Boston | Thu, May 21 | Iberia
        US$386 US$622
        38% off
        38% off
        US$622 US$386
      • BOS 20:05
        15h 50m
        1 stop
        BIO 17:55
        Boston - Bilbao | Wed, May 13 | United Airlines
        BIO 07:15
        16h 25m
        1 stop
        BOS 17:40
        Bilbao - Boston | Thu, May 21 | Lufthansa
        US$409 US$622
        34% off
        34% off
        US$622 US$409
      • BOS 17:25
        16h 30m
        1 stop
        BIO 15:55
        Boston - Bilbao | Thu, May 28 | KLM
        BIO 08:20
        14h 13m
        1 stop
        BOS 16:33
        Bilbao - Boston | Wed, Jun 3 | KLM
        US$418 US$622
        33% off
        33% off
        US$622 US$418
      • BOS 22:50
        11h 45m
        1 stop
        BIO 16:35
        Boston - Bilbao | Thu, May 14 | Iberia
        BIO 14:25
        12h 40m
        1 stop
        BOS 21:05
        Bilbao - Boston | Thu, May 21 | Iberia
        US$423
        32% off
        US$622 US$423
      • BOS 20:05
        15h 50m
        1 stop
        BIO 17:55
        Boston - Bilbao | Wed, May 13 | Lufthansa
        BIO 11:55
        11h 45m
        1 stop
        BOS 17:40
        Bilbao - Boston | Thu, May 21 | United Airlines
        US$424
        32% off
        US$622 US$424
      • BOS 17:40
        17h 15m
        1 stop
        BIO 16:55
        Boston - Bilbao | Thu, May 21 | Iberia
        BIO 13:10
        13h 55m
        1 stop
        BOS 21:05
        Bilbao - Boston | Thu, May 28 | Iberia
        US$427
        31% off
        US$622 US$427
      • BOS 22:50
        12h 45m
        1 stop
        BIO 17:35
        Boston - Bilbao | Thu, May 28 | Iberia
        BIO 17:35
        32h 15m
        1 stop
        BOS 19:50
        Bilbao - Boston | Wed, Jun 3 | Iberia
        US$427
        31% off
        US$622 US$427
      • BOS 21:20
        19h 55m
        1 stop
        BIO 23:15
        Boston - Bilbao | Thu, May 21 | Finnair
        BIO 06:45
        15h 25m
        1 stop
        BOS 16:10
        Bilbao - Boston | Thu, May 28 | Finnair
        US$430
        31% off
        US$622 US$430
      • BOS 20:05
        21h 20m
        1 stop
        BIO 23:25
        Boston - Bilbao | Mon, May 11 | Lufthansa
        BIO 18:40
        29h
        1 stop
        BOS 17:40
        Bilbao - Boston | Tue, May 19 | Lufthansa
        US$431
        31% off
        US$622 US$431
      • BOS 20:05
        21h 20m
        1 stop
        BIO 23:25
        Boston - Bilbao | Thu, May 28 | United Airlines
        BIO 07:15
        16h 25m
        1 stop
        BOS 17:40
        Bilbao - Boston | Wed, Jun 3 | Lufthansa
        US$435
        30% off
        US$622 US$435
      • BOS 13:00
        17h 25m
        1 stop
        BIO 14:00
        Boston - Bilbao | Tue, May 12 | Normal Airline
        BIO 15:00
        6h
        Nonstop
        BOS 16:00
        Bilbao - Boston | Thu, May 14 | Normal Airline
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      • BOS 20:10
        20h 30m
        1 stop
        BIO 22:40
        Boston - Bilbao | Sat, May 16 | American Airlines
        US$322 US$779
        59% off
        59% off
        US$779 US$322
      • BOS 22:50
        13h 25m
        1 stop
        BIO 18:15
        Boston - Bilbao | Sat, May 16 | China Express General Aviation Co., Ltd.
        US$466 US$779
        40% off
        40% off
        US$779 US$466
      • BOS 20:05
        15h 50m
        1 stop
        BIO 17:55
        Boston - Bilbao | Sat, May 16 | Austrian Airlines
        US$472 US$779
        39% off
        39% off
        US$779 US$472
      • BOS 21:45
        30h 5m
        1 stop
        BIO 09:50
        Boston - Bilbao | Mon, May 11 | Delta Air Lines
        US$503
        35% off
        US$779 US$503
      • BOS 21:45
        18h 15m
        1 stop
        BIO 22:00
        Boston - Bilbao | Mon, May 11 | Air France
        US$516
        34% off
        US$779 US$516
      • BOS 21:45
        18h 15m
        1 stop
        BIO 22:00
        Boston - Bilbao | Mon, May 11 | KLM
        US$516
        34% off
        US$779 US$516
      • BOS 23:10
        17h 30m
        1 stop
        BIO 22:40
        Boston - Bilbao | Sat, May 16 | Virgin Atlantic
        US$524
        33% off
        US$779 US$524
      • BOS 23:10
        17h 30m
        1 stop
        BIO 22:40
        Boston - Bilbao | Sat, May 16 | Delta Air Lines
        US$526
        32% off
        US$779 US$526
      • BOS 21:15
        14h 10m
        1 stop
        BIO 17:25
        Boston - Bilbao | Tue, Jun 16 | Aer Lingus
        US$541
        31% off
        US$779 US$541
      • BOS 20:05
        21h 20m
        1 stop
        BIO 23:25
        Boston - Bilbao | Tue, Jun 16 | United Airlines
        US$545
        30% off
        US$779 US$545
      • BOS 13:00
        17h 25m
        1 stop
        BIO 14:00
        Boston - Bilbao | Tue, May 12 | Normal Airline
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Displayed flight fares from Boston to Bilbao are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Frequently Asked Questions

  • What are the cheapest flights from Boston to Bilbao (BOS-BIO)?

    Based on Trip.com data, American Airlines offers one-way fares as low as US$322 on Cheapest nonstop routes (e.g. BOS to BIO on Sat, May 16), while Iberia offers Cheapest nonstop round-trips from US$386 departing on Wed, May 13 and returning on Thu, May 21.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Boston to Bilbao is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Boston to Bilbao, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sat, May 16, with one-way flights priced at just US$322.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is American Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Bilbao travel is around January.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Boston to Bilbao is October, when demand for travel is lower.
  • After crunching the numbers on our May flight calendar, it's currently cheapest to fly from Boston to Bilbao on May 10, 2026 with Lufthansa, with prices starting at US$488.
  • The time difference between Bilbao and Boston is 6h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

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Note: Prices shown on this page are the estimated lowest prices found in the last 24 hours and include all taxes and fees.

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Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are clearly shown before you pay. Charges for checked baggage, onboard meals, Wi‑Fi, and other optional services are also included where applicable in the flight cards.

Real-time pricing updates

Prices, availability, and travel details on this page have been updated within the last 24 hours, and for many routes are refreshed in real time. The more popular the route, the more accurate and up-to-date the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.