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$209+ 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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — BIO
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to Bilbao are usually found in February or November, booked 57 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 September 15, 2025.

Round-trip from

$335
(Cheapflightsfares)

One-way from

$279
(FlightHub)

Popular in

December

Cheapest in

February

Average price

$563
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. 5% potential increase in price ($38 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 15, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/12. 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.
Mon 10/69:20 pmBOS - BIO
1 stop13h 35mIberia
Tue 10/141:15 pmBIO - BOS
1 stop14h 00mIberia
Deal found 9/12$335
This lol.travel deal was found by Cheapflights users on 9/13. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/19:20 pmBOS - BIO
1 stop19h 55mFinnair
Tue 12/166:45 amBIO - BOS
1 stop14h 30mFinnair
Deal found 9/13$337
This Iberia deal was found by Cheapflights users on 9/14. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/210:40 pmBOS - BIO
1 stop17h 00mIberia
Tue 12/91:35 pmBIO - BOS
2 stops15h 19mIberia
Deal found 9/14$350
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/139:40 pmBOS - BIO
1 stop16h 35mMultiple Airlines
Mon 10/206:35 pmBIO - BOS
1 stop29h 05mMultiple Airlines
Deal found 9/13$359
This Finnair deal was found by Cheapflights users on 9/14. 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.
Tue 12/23:35 pmBOS - BIO
2 stops25h 40mMultiple Airlines
Tue 12/96:45 amBIO - BOS
2 stops22h 09mMultiple Airlines
Deal found 9/14$364
This Expedia deal was found by Cheapflights users on 9/13. 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.
Mon 10/1311:00 pmBOS - BIO
1 stop12h 35mIberia
Mon 10/209:35 pmBIO - BOS
2 stops25h 40mIberia
Deal found 9/13$380
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/268:40 pmBOS - BIO
1 stop15h 25mUnited Airlines
Thu 12/47:25 amBIO - BOS
1 stop17h 10mUnited Airlines
Deal found 9/15$383
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/288:40 pmBOS - BIO
1 stop15h 25mUnited Airlines
Fri 1/911:35 amBIO - BOS
1 stop13h 00mUnited Airlines
Deal found 9/14$384
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:40 pmBOS - BIO
1 stop15h 25mUnited Airlines
Fri 1/911:35 amBIO - BOS
1 stop13h 00mUnited Airlines
Deal found 9/14$386

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 September 15, 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

Tue 12/2

3:35 pm-11:15 pm

2 stops25h 40m

Bilbao

Tue 12/9

6:45 am-10:54 pm

2 stops22h 09m

$364

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Mon 11/24

8:40 pm-11:05 pm

1 stop20h 25m

Bilbao

Thu 12/4

11:35 am-6:35 pm

1 stop13h 00m

$383

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Wed 11/26

8:40 pm-11:05 pm

1 stop20h 25m

Bilbao

Thu 12/4

11:35 am-6:35 pm

1 stop13h 00m

$383

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Wed 11/26

8:40 pm-6:05 pm

1 stop15h 25m

Bilbao

Tue 12/2

11:35 am-6:35 pm

1 stop13h 00m

$383

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 12/28

8:40 pm-6:05 pm

1 stop15h 25m

Bilbao

Fri 1/9

11:35 am-6:35 pm

1 stop13h 00m

$384

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Wed 2/4

9:20 pm-11:15 pm

1 stop19h 55m

Bilbao

Sun 2/8

1:35 pm-7:50 pm

1 stop12h 15m

$391

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Mon 11/24

1:30 pm-10:50 am

2 stops15h 20m

Bilbao

Fri 12/5

11:35 am-10:45 pm

2 stops17h 10m

$398

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Thu 10/30

5:59 pm-11:15 pm

2 stops24h 16m

Bilbao

Thu 11/6

6:45 am-3:15 pm

1 stop14h 30m

$404

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Tue 12/30

4:20 pm-12:05 pm

1 stop13h 45m

Bilbao

Fri 1/9

11:35 am-6:35 pm

1 stop13h 00m

$408

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 10/5

11:55 pm-8:15 am

1 stop26h 20m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 19 results
1
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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 September 12, 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 57 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 $1,136). 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 September 15, 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 September 15, 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
7,954 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

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
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

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
7,954 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

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
8,929 reviews
Delta
8.0
Very good
7,954 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

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
2,924 reviews
Delta
8.0
Very good
7,954 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

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
7,407 reviews
Delta
8.0
Very good
7,954 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Comfort

7.9

Crew

8.5

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.

  • How long is the flight from Boston to Bilbao?

    A quick flight from Boston to Bilbao can take about 20h 25m. United Airlines provides one of the quickest options available for as low as $383. There are 3348 mi between Boston and Bilbao.

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

    According to our current data, Iberia ($395), LEVEL ($418), and Delta ($424) offers the cheapest pricing from Boston to Bilbao. Iberia is 41% 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 $1,136). 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$395Average$680FlexibilityNo cancel feeOn-time77%
LEVELCheapest$418Average$753FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$423Average$718FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$428Average$695FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$439Average$657FlexibilityNo cancel feeOn-time71%
KLMCheapest$532Average$810FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$574Average$777FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$576Average$712FlexibilityNo cancel feeOn-time69%

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