HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Sebastian

$242+ Cheap flights from Boston (BOS) to San Sebastian (EAS)

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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — EAS
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Boston to San Sebastian 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 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 September 16, 2025.

Round-trip from

$428
(Iberia)

One-way from

$242
(Kiwi.com)

Popular in

February

Cheapest in

October

Average price

$647
From Boston Logan Intl to San Sebastián
Search Deals
One-way flight from Boston Logan Intl to San Sebastián
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($273 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease ($92 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 16, 2025.

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.
Mon 10/134:30 pmBOS - EAS
1 stop10h 10mIberia
Mon 10/209:30 pmEAS - BOS
2 stops25h 45mIberia
Deal found 9/14$428
This Iberia 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/305:45 pmBOS - EAS
1 stop9h 55mIberia
Thu 11/69:30 pmEAS - BOS
1 stop23h 45mIberia
Deal found 9/15$478
This Travelocity 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1310:00 pmBOS - EAS
2 stops28h 40mMultiple Airlines
Mon 10/209:30 pmEAS - BOS
2 stops25h 45mMultiple Airlines
Deal found 9/14$484
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/163:00 pmBOS - EAS
2 stops16h 00mIberia
Mon 10/209:30 pmEAS - BOS
2 stops25h 45mIberia
Deal found 9/15$512
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/44:34 pmBOS - EAS
2 stops34h 06mIberia
Sun 11/29:30 pmEAS - BOS
2 stops53h 25mIberia
Deal found 9/14$518
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.
Thu 11/274:45 pmBOS - EAS
1 stop14h 15mIberia
Sun 12/79:30 pmEAS - BOS
1 stop23h 45mIberia
Deal found 9/14$528
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:29 amBOS - EAS
2 stops19h 11mAmerican Airlines
Thu 11/61:40 pmEAS - BOS
2 stops15h 07mAmerican Airlines
Deal found 9/15$540
This Iberia 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 Iberia 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
Tue 12/29:20 amEAS - BOS
2 stops17h 35mIberia
Deal found 9/15$545
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2711:55 amBOS - EAS
2 stops19h 05mAmerican Airlines
Sun 12/79:20 amEAS - BOS
1 stop16h 30mAmerican Airlines
Deal found 9/15$552

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 September 16, 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

Mon 10/13

4:30 pm-8:40 am

1 stop10h 10m

San Sebastián

Mon 10/20

9:30 pm-5:15 pm

2 stops25h 45m

$428

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Mon 10/13

10:00 pm-8:40 am

2 stops28h 40m

San Sebastián

Mon 10/20

9:30 pm-5:15 pm

2 stops25h 45m

$484

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sat 10/4

4:34 pm-8:40 am

2 stops34h 06m

San Sebastián

Sun 11/2

9:30 pm-8:55 pm

2 stops53h 25m

$518

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Thu 11/27

4:45 pm-1:00 pm

1 stop14h 15m

San Sebastián

Sun 12/7

9:30 pm-3:15 pm

1 stop23h 45m

$528

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Thu 11/27

4:45 pm-8:40 am

1 stop9h 55m

San Sebastián

Tue 12/2

9:20 am-8:55 pm

2 stops17h 35m

$545

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Fri 10/3

4:30 pm-8:40 am

2 stops34h 10m

San Sebastián

Sun 11/2

9:30 pm-8:55 pm

2 stops53h 25m

$566

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Fri 10/3

4:35 pm-8:50 pm

1 stop22h 15m

San Sebastián

Sat 11/1

1:40 pm-10:53 pm

2 stops14h 13m

$571

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Tue 10/14

11:00 pm-8:25 am

1 stop27h 25m

$242

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Wed 10/15

11:00 pm-8:30 am

1 stop27h 30m

$272

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Fri 10/3

2:53 pm-8:50 am

3 stops35h 57m

$320

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 12 results
1
2

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.

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 September 16, 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
10,000 reviews

Comfort

7.2

Overall

7.2

Boarding

7.5

Entertainment

6.9

Food

6.4

Crew

8.0

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
10,000 reviews
American Airlines
7.2
Good
10,000 reviews

Comfort

7.2

Overall

7.2

Boarding

7.5

Entertainment

6.9

Food

6.4

Crew

8.0

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
2,924 reviews
American Airlines
7.2
Good
10,000 reviews

Comfort

7.2

Overall

7.2

Boarding

7.5

Entertainment

6.9

Food

6.4

Crew

8.0

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 Iberia fly from Boston to San Sebastian in about 10h 10m. The time it takes to get you to your destination can typically vary by up to . The distance from Boston to San Sebastian is about 3398 mi.

  • 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 $522. American Airlines is priced at 49% 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.

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 San Sebastian

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

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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$450Average$864FlexibilityNo cancel feeOn-time71%
IberiaCheapest$522Average$858FlexibilityNo cancel feeOn-time77%

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.