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San Sebastian

$454+ Cheap flights from Boston (BOS) to San Sebastian (EAS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — EAS
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
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Find flight deals from Boston to San Sebastian

Cheapest flights from Boston to San Sebastian
Explore the most affordable flight options available from Boston to San Sebastian. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 23, 2025.

This American Airlines deal was found by Cheapflights users on 10/21. 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.
Sun 11/304:45 pmBOS - EAS
1 stop14h 15mAmerican Airlines
Tue 12/161:40 pmEAS - BOS
2 stops15h 14mAmerican Airlines
Deal found 10/21$454
This Expedia deal was found by Cheapflights users on 10/21. 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.
Sun 11/309:20 pmBOS - EAS
1 stop29h 20mIberia
Tue 12/162:05 pmEAS - BOS
1 stop12h 50mIberia
Deal found 10/21$455
This Kiwi.com deal was found by Cheapflights users on 10/22. 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.
Sun 11/304:45 pmBOS - EAS
1 stop9h 55mMultiple Airlines
Tue 12/99:20 amEAS - BOS
1 stop11h 55mMultiple Airlines
Deal found 10/22$457
This FlightHub deal was found by Cheapflights users on 10/22. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/304:45 pmBOS - EAS
1 stop9h 55mMultiple Airlines
Wed 12/109:30 pmEAS - BOS
1 stop23h 45mMultiple Airlines
Deal found 10/22$473
This Gurufare deal was found by Cheapflights users on 10/22. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/304:45 pmBOS - EAS
1 stop9h 55mMultiple Airlines
Thu 12/119:30 pmEAS - BOS
1 stop23h 45mMultiple Airlines
Deal found 10/22$488
This Iberia deal was found by Cheapflights users on 10/22. 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.
Sat 11/299:20 pmBOS - EAS
1 stop9h 40mIberia
Wed 12/109:20 amEAS - BOS
2 stops19h 34mIberia
Deal found 10/22$508
This Gurufare deal was found by Cheapflights users on 10/22. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/294:45 pmBOS - EAS
1 stop9h 55mMultiple Airlines
Thu 12/119:30 pmEAS - BOS
1 stop23h 45mMultiple Airlines
Deal found 10/22$538
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 12/110:40 pmBOS - EAS
1 stop32h 50mMultiple Airlines
Thu 12/112:05 pmEAS - BOS
1 stop12h 50mMultiple Airlines
Deal found 10/22$540
This Cheapflightsfares deal was found by Cheapflights users on 10/23. 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.
Thu 11/274:45 pmBOS - EAS
1 stop9h 55mIberia
Sun 12/79:20 amEAS - BOS
1 stop16h 30mIberia
Deal found 10/23$542
This Expedia deal was found by Cheapflights users on 10/21. 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.
Sun 11/309:35 pmBOS - EAS
2 stops29h 05mMultiple Airlines
Tue 12/161:40 pmEAS - BOS
2 stops14h 15mMultiple Airlines
Deal found 10/21$543

Cheap flight deals from Boston to San Sebastian

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to San Sebastian (EAS). 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 October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$454
(American Airlines)

Popular in

February

Cheapest in

November

Average price

$591
Provider with most accurate pricing for Boston Logan Intl-San Sebastián flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-San Sebastián flights.
Search Deals
From Boston Logan Intl to San Sebastián
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($289 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($85 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to San Sebastian 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 October 23, 2025.
Use the filters below to find and compare flights from Boston to San Sebastian that are best for you.

Fly from

Boston

Fly to

San Sebastian

Route

Depart

Return

Price

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sun 11/30

4:45 pm-1:00 pm

1 stop14h 15m

San Sebastián

Tue 12/16

1:40 pm-10:54 pm

2 stops15h 14m

$454

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sun 11/30

9:20 pm-8:40 am

1 stop29h 20m

San Sebastián

Tue 12/16

2:05 pm-8:55 pm

1 stop12h 50m

$455

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sat 11/29

9:20 pm-1:00 pm

1 stop9h 40m

San Sebastián

Wed 12/10

9:30 pm-3:15 pm

1 stop23h 45m

$508

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sat 11/29

4:45 pm-8:40 am

1 stop9h 55m

San Sebastián

Tue 12/9

1:40 pm-10:54 pm

2 stops15h 14m

$538

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Thu 11/27

4:45 pm-8:40 am

1 stop9h 55m

San Sebastián

Sun 12/7

9:20 am-7:50 pm

1 stop16h 30m

$542

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sat 11/29

4:45 pm-8:40 am

1 stop9h 55m

San Sebastián

Thu 12/11

9:20 am-6:52 pm

2 stops15h 32m

$544

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Thu 11/27

11:55 am-1:00 pm

2 stops19h 05m

San Sebastián

Sun 12/7

9:20 am-7:50 pm

1 stop16h 30m

$552

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

Compare providers for flights from Boston to San Sebastian

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 San Sebastian in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 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-San Sebastian flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-San Sebastian flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-San Sebastian flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-San Sebastian 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-San Sebastian 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 San Sebastian

Have a flexible travel schedule? Discover the best time to fly to San Sebastian 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 San Sebastian

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

Currently, October is the cheapest month in which you can book a flight from Boston to San Sebastian (average of $359). Flying from Boston to San Sebastian in June is currently the most expensive (average of $584). 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.

How much does it cost to fly round-trip from Boston to San Sebastian?

Reviews of airlines servicing San Sebastian

Get insights into the airlines that provide service to San Sebastian. 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 San Sebastian. Reviews last updated October 23, 2025.
Peruse reviews from past customers who have flown with American Airlines and Iberia from Boston to San Sebastian to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,028 reviews

Comfort

7.2

Entertainment

6.9

Crew

8.0

Boarding

7.5

Food

6.4

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
American Airlines
7.2
Good
11,028 reviews
American Airlines
7.2
Good
11,028 reviews

Comfort

7.2

Entertainment

6.9

Crew

8.0

Boarding

7.5

Food

6.4

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
Iberia
7.0
Good
2,997 reviews
American Airlines
7.2
Good
11,028 reviews

Comfort

7.2

Entertainment

6.9

Crew

8.0

Boarding

7.5

Food

6.4

Overall

7.2

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac

Related info for your journey

Find useful and relevant information for your journey from Boston to San Sebastian. 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 San Sebastian?

    Airlines like American Airlines and Iberia fly from Boston to San Sebastian in about 14h 15m. The time it takes to get you to your destination can typically vary by up to 15h 05m. The distance from Boston to San Sebastian is about 3398 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Currently priced at $450, American Airlines will fly you from Boston to San Sebastian and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Iberia for as low as $529. American Airlines is priced at 48% lower than the current average price of a flight leaving 3 months from now.

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

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

  • How can I find direct flights from Boston to San Sebastian?

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

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

    Yes. Cheapflights offers flight deals from Boston to San Sebastian 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 San Sebastian?

    Currently, October is the cheapest month in which you can book a flight from Boston to San Sebastian (average of $359). Flying from Boston to San Sebastian in June is currently the most expensive (average of $584). 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

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Alternative routes for Boston to San Sebastian

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Boston to San Sebastian

Discover the top 2 airlines that operate flights from Boston to San Sebastian. 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 October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$450Average$882FlexibilityNo cancel feeOn-time71%
IberiaCheapest$529Average$846FlexibilityNo cancel feeOn-time77%

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