HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bilbao

$251+ 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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — BIO
Mar 24 — Mar 311
Tue 3/24
Tue 3/31
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Boston to Bilbao with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap 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 February 22, 2026.

This Iberia deal was found by Cheapflights users on 2/21. 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.
Mon 4/2010:50 pm
BOS
-
BIO
1 stop11h 35m
Iberia
Wed 4/292:25 pm
BIO
-
BOS
1 stop12h 40m
Iberia
Deal found 2/21$371
This Finnair deal was found by Cheapflights users on 2/21. 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 4/205:40 pm
BOS
-
BIO
1 stop13h 05m
Multiple Airlines
Wed 4/296:45 am
BIO
-
BOS
2 stops23h 07m
Multiple Airlines
Deal found 2/21$385
This Finnair deal was found by Cheapflights users on 2/20. 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 10/209:20 pm
BOS
-
BIO
1 stop19h 55m
Multiple Airlines
Tue 10/279:35 pm
BIO
-
BOS
1 stop23h 40m
Multiple Airlines
Deal found 2/20$386
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/28:30 pm
BOS
-
BIO
1 stop14h 50m
Delta
Tue 3/177:25 am
BIO
-
BOS
1 stop12h 05m
Delta
Deal found 2/20$388
This KLM deal was found by Cheapflights users on 2/21. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/275:20 pm
BOS
-
BIO
1 stop16h 35m
KLM
Wed 8/268:20 am
BIO
-
BOS
1 stop14h 11m
KLM
Deal found 2/21$400
This Expedia deal was found by Cheapflights users on 2/21. 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 9/711:00 pm
BOS
-
BIO
1 stop9h 55m
Iberia
Mon 9/289:35 pm
BIO
-
BOS
1 stop24h 35m
Iberia
Deal found 2/21$410
This Finnair deal was found by Cheapflights users on 2/20. 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 9/79:20 pm
BOS
-
BIO
1 stop19h 55m
Multiple Airlines
Mon 9/289:35 pm
BIO
-
BOS
1 stop24h 35m
Multiple Airlines
Deal found 2/20$411
This United Airlines deal was found by Cheapflights users on 2/21. 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.
Mon 4/204:35 pm
BOS
-
BIO
2 stops36h 35m
United Airlines
Wed 4/296:50 am
BIO
-
BOS
2 stops41h 11m
United Airlines
Deal found 2/21$413
This American Airlines deal was found by Cheapflights users on 2/21. 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.
Mon 4/203:17 pm
BOS
-
BIO
2 stops15h 28m
American Airlines
Wed 4/291:30 pm
BIO
-
BOS
2 stops16h 22m
American Airlines
Deal found 2/21$414

Find 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 February 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$371
(Iberia)

One-way from

$251
(Trip.com)

Popular in

May

Cheapest in

October

Average price

$604
Provider with most accurate pricing for Boston Logan Intl-Bilbao flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Bilbao flights.
Search Deals
From Boston Logan Intl to Bilbao
Search Deals
One-way flight from Boston Logan Intl to Bilbao
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($90 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 22, 2026.
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

Mon 3/2

8:30 pm-5:20 pm

1 stop14h 50m

Bilbao

Tue 3/17

7:25 am-2:30 pm

1 stop12h 05m

$388

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Tue 3/10

5:45 pm-8:30 am

1 stop9h 45m

Bilbao

Mon 3/16

5:35 pm-4:15 pm

1 stop27h 40m

$451

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Tue 4/7

9:20 pm-11:15 pm

1 stop19h 55m

Bilbao

Tue 4/14

6:45 am-7:50 pm

1 stop19h 05m

$475

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 4/19

11:34 am-8:30 am

2 stops14h 56m

Bilbao

Tue 4/28

9:15 am-6:48 pm

2 stops15h 33m

$475

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 3/15

10:20 pm-11:15 pm

1 stop19h 55m

Bilbao

Mon 3/30

6:45 am-7:50 pm

1 stop19h 05m

$496

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Fri 4/3

10:50 pm-3:20 pm

1 stop10h 30m

Bilbao

Tue 4/7

9:35 pm-7:50 pm

1 stop28h 15m

$506

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Thu 3/19

5:45 pm-8:30 am

1 stop9h 45m

Bilbao

Thu 3/26

1:50 pm-8:45 pm

1 stop11h 55m

$517

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Tue 3/10

8:10 pm-11:20 am

1 stop10h 10m

Bilbao

Sun 3/15

5:20 pm-2:20 pm

1 stop26h 00m

$528

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sat 5/16

5:25 pm-11:55 am

1 stop12h 30m

Bilbao

Sat 5/30

8:20 am-4:33 pm

1 stop14h 13m

$545

BostonBilbao

BOS - BIO

BOSBIO

Boston Logan Intl

Sun 3/15

9:00 pm-10:45 pm

2 stops20h 45m

Bilbao

Mon 3/30

5:15 pm-4:25 pm

1 stop29h 10m

$555

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 19 results
1
2

Compare providers for flights from Boston to Bilbao

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Bilbao in February.
ProviderPrice AccuracyTrust Score*
OvagoPrice Accuracy2 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-Bilbao flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Bilbao flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-Bilbao flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-Bilbao flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Bilbao flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 February 20, 2026.

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, March is the cheapest month in which you can book a flight from Boston to Bilbao (average of $346). Flying from Boston to Bilbao in July is currently the most expensive (average of $579). 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.

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 February 22, 2026.
Read through reviews of airlines operating flights from Boston to Bilbao, such as KLM, United Airlines, and Iberia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,457 reviews

Comfort

7.6

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7.7
Good
1,457 reviews
KLM
7.7
Good
1,457 reviews

Comfort

7.6

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
United Airlines
7.4
Good
9,341 reviews
KLM
7.7
Good
1,457 reviews

Comfort

7.6

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Iberia
7.0
Good
3,118 reviews
KLM
7.7
Good
1,457 reviews

Comfort

7.6

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Lufthansa
6.8
Okay
7,802 reviews
KLM
7.7
Good
1,457 reviews

Comfort

7.6

Overall

7.7

Boarding

7.8

Food

7.3

Crew

8.4

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

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 9h 45m. Delta provides one of the quickest options available for as low as $451. There are 3348 mi between Boston and Bilbao. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    According to our current data, Iberia ($381), United Airlines ($393), and Lufthansa ($417) offers the cheapest pricing from Boston to Bilbao. Iberia 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, March is the cheapest month in which you can book a flight from Boston to Bilbao (average of $346). Flying from Boston to Bilbao in July is currently the most expensive (average of $579). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 February 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$381Average$619FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$393Average$703FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$417Average$737FlexibilityNo cancel feeOn-time76%
DeltaCheapest$424Average$741FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$439Average$657FlexibilityNo cancel feeOn-time71%
TAP AIR PORTUGALCheapest$468Average$815FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$469Average$698FlexibilityNo cancel feeOn-time75%
LEVELCheapest$523Average$753FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.