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Bilbao

$207+ Cheap flights from Boston (BOS) to Bilbao (BIO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — BIO
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to Bilbao are usually found in February or September, booked 42 days in advance, depart on a Sunday or Wednesday and return on a Wednesday

Cheap flight deals from Boston to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Bilbao (BIO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 18, 2025.

Round-trip from

$371
(Finnair)

One-way from

$207
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$647
From Boston Logan Intl to Bilbao
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One-way flight from Boston Logan Intl to Bilbao
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Highest demand for flights based on searches. 9% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Boston to Bilbao

Cheapest flights from Boston to Bilbao
Explore the most affordable flight options available from Boston to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/24:45 pmBOS - BIO
1 stop9h 45mIberia
Wed 11/129:15 amBIO - BOS
1 stop12h 00mIberia
Deal found 8/15$370
This Finnair deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:20 pmBOS - BIO
1 stop19h 55mFinnair
Wed 10/86:45 amBIO - BOS
1 stop19h 05mFinnair
Deal found 8/17$371
This Mytrip deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/296:00 amBOS - BIO
2 stops26h 45mMultiple Airlines
Mon 10/66:35 pmBIO - BOS
1 stop29h 05mMultiple Airlines
Deal found 8/15$374
This American Airlines deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/93:52 pmBOS - BIO
2 stops14h 58mAmerican Airlines
Wed 11/196:45 amBIO - BOS
1 stop19h 05mAmerican Airlines
Deal found 8/15$375
This Finnair deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/204:30 pmBOS - BIO
1 stop14h 15mMultiple Airlines
Mon 10/279:35 pmBIO - BOS
1 stop23h 40mMultiple Airlines
Deal found 8/15$381
This Booking.com deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/298:05 pmBOS - BIO
1 stop21h 20mLufthansa
Mon 10/66:35 pmBIO - BOS
1 stop29h 05mLufthansa
Deal found 8/15$389
This Expedia deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/153:52 pmBOS - BIO
2 stops34h 38mIberia
Mon 11/249:35 pmBIO - BOS
1 stop23h 40mIberia
Deal found 8/15$391
This Finnair deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/23:35 pmBOS - BIO
2 stops25h 40mMultiple Airlines
Wed 11/126:45 amBIO - BOS
2 stops22h 01mMultiple Airlines
Deal found 8/15$394
This Cheapflightsfares deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/164:30 pmBOS - BIO
1 stop10h 00mIberia
Tue 9/236:45 amBIO - BOS
1 stop14h 15mIberia
Deal found 8/17$395

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to Bilbao that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 18, 2025.
Use the filters below to find and compare flights from Boston to Bilbao that are best for you.

Fly from

Boston

Fly to

Bilbao

Route

Depart

Return

Price

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 11/2

4:45 pm-8:30 am

1 stop9h 45m

Bilbao

Wed 11/12

9:15 am-3:15 pm

1 stop12h 00m

$370

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 11/9

4:45 pm-12:50 pm

1 stop14h 05m

Bilbao

Wed 11/19

9:15 am-7:50 pm

1 stop16h 35m

$370

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Wed 10/1

9:20 pm-11:15 pm

1 stop19h 55m

Bilbao

Wed 10/8

6:45 am-7:50 pm

1 stop19h 05m

$371

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Mon 9/29

6:00 am-2:45 pm

2 stops26h 45m

Bilbao

Mon 10/6

6:35 pm-5:40 pm

1 stop29h 05m

$374

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 11/9

3:52 pm-12:50 pm

2 stops14h 58m

Bilbao

Wed 11/19

6:45 am-7:50 pm

1 stop19h 05m

$375

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Mon 10/20

4:30 pm-12:45 pm

1 stop14h 15m

Bilbao

Mon 10/27

9:35 pm-4:15 pm

1 stop23h 40m

$381

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 11/2

4:45 pm-8:30 am

1 stop9h 45m

Bilbao

Wed 11/12

1:35 pm-10:46 pm

2 stops15h 11m

$381

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Mon 9/29

8:05 pm-11:25 pm

1 stop21h 20m

Bilbao

Mon 10/6

6:35 pm-5:40 pm

1 stop29h 05m

$389

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sat 11/15

3:52 pm-8:30 am

2 stops34h 38m

Bilbao

Mon 11/24

9:35 pm-3:15 pm

1 stop23h 40m

$391

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Tue 10/28

10:50 pm-11:10 pm

2 stops43h 20m

$207

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 18 results
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Best time to book a flight from Boston to Bilbao

Have a flexible travel schedule? Discover the best time to fly to Bilbao from Boston with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to Bilbao

How far ahead should I book a flight from Boston to Bilbao?

Use this chart to determine the optimal time to book a round-trip flight from Boston to Bilbao. Price data was last updated on August 8, 2025.

The price you pay for your flight from Boston to Bilbao may vary depending on when you book. For the best chance of a lower fare, look to book 42 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Boston to Bilbao?

Currently, January is the cheapest month in which you can book a flight from Boston to Bilbao (average of $541). Flying from Boston to Bilbao in June is currently the most expensive (average of $1,139). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOS to BIO?

Find hourly flight availability from Boston to Bilbao. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 18, 2025.

It’s typically best to fly out from Boston to Bilbao in the morning. Doing so could potentially save you 20% on the flight price compared to flying in the afternoon, which is usually more expensive.

Reviews of airlines servicing Bilbao

Get insights into the airlines that provide service to Bilbao. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Bilbao. Reviews last updated August 18, 2025.
Read through reviews of airlines operating flights from Boston to Bilbao, such as Delta, KLM, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,385 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,925 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Iberia
7.0
Good
2,884 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Lufthansa
6.8
Okay
7,330 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Boston to Bilbao. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Boston to Bilbao round-trip?

    According to our current data, LEVEL ($418), Delta ($424), and TAP AIR PORTUGAL ($428) offers the cheapest pricing from Boston to Bilbao. LEVEL is 39% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Boston to Bilbao that include hotel bookings?

    Yes. In addition to deals on Boston to Bilbao flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boston to Bilbao?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Bilbao.

  • Can I find deals for business class flights from Boston to Bilbao?

    Yes. Cheapflights offers flight deals from Boston to Bilbao by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boston to Bilbao?

    Currently, January is the cheapest month in which you can book a flight from Boston to Bilbao (average of $541). Flying from Boston to Bilbao in June is currently the most expensive (average of $1,139). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Boston to Bilbao

See prices for flight routes from nearby airports that may be better suited for you.
Boston to San Sebastian flights
Hartford to Bilbao flights

Top 8 airlines flying from Boston to Bilbao

Discover the top 8 airlines that operate flights from Boston to Bilbao. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
LEVELCheapest$418Average$753FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$424Average$708FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$428Average$695FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$439Average$657FlexibilityNo cancel feeOn-time71%
IberiaCheapest$486Average$701FlexibilityNo cancel feeOn-time77%
KLMCheapest$545Average$892FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$576Average$774FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$576Average$712FlexibilityNo cancel feeOn-time69%

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