HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Sebastian

$382+ 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 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — EAS
Jan 29 — Feb 51
Thu 1/29
Thu 2/5
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

Best flights from Boston to San Sebastian
Discover carefully curated flight deals from Boston to San Sebastian that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 30, 2025.

This Trip.com deal was found by Cheapflights users on 12/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/114:45 pmBOS - EAS
1 stop9h 55mIberia
Wed 2/181:40 pmEAS - BOS
1 stop12h 10mIberia
Deal found 12/27$498
This American Airlines deal was found by Cheapflights users on 12/27. 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.
Wed 2/1112:16 pmBOS - EAS
2 stops14h 24mAmerican Airlines
Wed 2/189:20 amEAS - BOS
1 stop16h 30mAmerican Airlines
Deal found 12/27$512
This American Airlines deal was found by Cheapflights users on 12/29. 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 4/1611:34 amBOS - EAS
2 stops15h 06mAmerican Airlines
Mon 4/201:40 pmEAS - BOS
1 stop12h 10mAmerican Airlines
Deal found 12/29$552
This Trip.com deal was found by Cheapflights users on 12/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/309:20 pmBOS - EAS
1 stop17h 30mIberia
Sat 2/149:30 pmEAS - BOS
1 stop23h 45mIberia
Deal found 12/29$552
This Iberia deal was found by Cheapflights users on 12/29. 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 4/1610:50 pmBOS - EAS
1 stop27h 30mIberia
Mon 4/209:30 pmEAS - BOS
1 stop28h 20mIberia
Deal found 12/29$576
This American Airlines deal was found by Cheapflights users on 12/29. 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.
Fri 1/303:35 pmBOS - EAS
2 stops23h 15mAmerican Airlines
Sat 2/149:30 pmEAS - BOS
2 stops28h 17mAmerican Airlines
Deal found 12/29$583
This Expedia deal was found by Cheapflights users on 12/29. 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 1/314:45 pmBOS - EAS
1 stop9h 55mIberia
Sat 2/219:30 pmEAS - BOS
2 stops53h 25mIberia
Deal found 12/29$688
This American Airlines deal was found by Cheapflights users on 12/28. 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 2/1211:55 amBOS - EAS
2 stops14h 45mAmerican Airlines
Thu 2/199:20 amEAS - BOS
2 stops19h 28mAmerican Airlines
Deal found 12/28$722
This Iberia deal was found by Cheapflights users on 12/28. 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 2/124:45 pmBOS - EAS
1 stop9h 55mIberia
Thu 2/199:20 amEAS - BOS
2 stops17h 35mIberia
Deal found 12/28$720

Find 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 December 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$498
(Trip.com)

One-way from

$382
(Trip.com)

Popular in

December

Cheapest in

November

Average price

$1,211
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
One-way flight from Boston Logan Intl to San Sebastián
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 30, 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

Wed 2/11

4:45 pm-8:40 am

1 stop9h 55m

San Sebastián

Wed 2/18

1:40 pm-7:50 pm

1 stop12h 10m

$498

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Wed 2/11

12:16 pm-8:40 am

2 stops14h 24m

San Sebastián

Wed 2/18

9:20 am-7:50 pm

1 stop16h 30m

$512

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Thu 4/16

11:34 am-8:40 am

2 stops15h 06m

San Sebastián

Mon 4/20

1:40 pm-7:50 pm

1 stop12h 10m

$552

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Fri 1/30

9:20 pm-8:50 pm

1 stop17h 30m

San Sebastián

Sat 2/14

9:30 pm-3:15 pm

1 stop23h 45m

$552

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Thu 4/16

10:50 pm-8:20 am

1 stop27h 30m

San Sebastián

Mon 4/20

9:30 pm-7:50 pm

1 stop28h 20m

$576

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Fri 1/30

3:35 pm-8:50 pm

2 stops23h 15m

San Sebastián

Sat 2/14

9:30 pm-7:47 pm

2 stops28h 17m

$583

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sat 1/31

4:45 pm-8:40 am

1 stop9h 55m

San Sebastián

Sat 2/21

9:30 pm-8:55 pm

2 stops53h 25m

$688

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Thu 2/12

4:45 pm-8:40 am

1 stop9h 55m

San Sebastián

Thu 2/19

9:20 am-8:55 pm

2 stops17h 35m

$720

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Thu 2/12

11:55 am-8:40 am

2 stops14h 45m

San Sebastián

Thu 2/19

9:20 am-10:48 pm

2 stops19h 28m

$722

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sun 2/15

10:45 pm-8:50 pm

2 stops16h 05m

$382

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/29

Showing 1-10 of 11 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Boston-San Sebastian flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $361). Flying from Boston to San Sebastian in July is currently the most expensive (average of $578). 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 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 December 30, 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
11,067 reviews

Food

6.4

Comfort

7.2

Overall

7.2

Crew

8.0

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Jeremy,Dec 2025

OKC - CLT

Was an okay flight. Had extra seat empty beside me so was able to stretch a bit
American Airlines
7.2
Good
11,067 reviews
American Airlines
7.2
Good
11,067 reviews

Food

6.4

Comfort

7.2

Overall

7.2

Crew

8.0

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Jeremy,Dec 2025

OKC - CLT

Was an okay flight. Had extra seat empty beside me so was able to stretch a bit
Iberia
7.0
Good
3,057 reviews
American Airlines
7.2
Good
11,067 reviews

Food

6.4

Comfort

7.2

Overall

7.2

Crew

8.0

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Jeremy,Dec 2025

OKC - CLT

Was an okay flight. Had extra seat empty beside me so was able to stretch a bit

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 and American Airlines fly from Boston to San Sebastian in about 9h 55m. The time it takes to get you to your destination can typically vary by up to 4h 29m. 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 $487. American Airlines is priced at 43% 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 $361). Flying from Boston to San Sebastian in July is currently the most expensive (average of $578). 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 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 December 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$450Average$868FlexibilityNo cancel feeOn-time71%
IberiaCheapest$487Average$825FlexibilityNo 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.
Site
©2025 Cheapflights