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Cheap flights from Boston to San Sebastian from $445

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to San Sebastian departing on 1/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Boston to San Sebastian

Cheap round-trip flights

Enter your travel dates to find the best prices.
Iberia Logo
4:45 pm - 1:00 pmBOS-EAS
14h 15m1 stop
Iberia Logo
2:05 pm - 8:55 pmEAS-BOS
12h 50m1 stop
$445Iberia
Find Deal
Mon, Jan 19 - Tue, Jan 27
Iberia Logo
9:20 pm - 8:50 pmBOS-EAS
17h 30m1 stop
Iberia Logo
9:20 am - 7:50 pmEAS-BOS
16h 30m1 stop
$447Iberia
Find Deal
Sun, Feb 22 - Wed, Mar 4
American Airlines Logo
3:35 pm - 1:00 pmBOS-EAS
15h 25m2 stops
American Airlines Logo
9:20 am - 3:15 pmEAS-BOS
11h 55m1 stop
$452American Airlines
Find Deal
Mon, Jan 19 - Tue, Jan 27
American Airlines Logo
12:16 pm - 8:40 amBOS-EAS
14h 24m2 stops
American Airlines Logo
1:40 pm - 10:56 pmEAS-BOS
15h 16m2 stops
$462American Airlines
Find Deal
Mon, Jan 19 - Tue, Jan 27
Iberia Logo
4:45 pm - 8:40 amBOS-EAS
9h 55m1 stop
Iberia Logo
1:40 pm - 7:50 pmEAS-BOS
12h 10m1 stop
$492Iberia
Find Deal
Sun, Feb 8 - Sun, Feb 15
Iberia Logo
9:20 pm - 8:50 pmBOS-EAS
17h 30m1 stop
Iberia Logo
9:20 am - 4:10 pmEAS-BOS
12h 50m1 stop
$497Iberia
Find Deal
Mon, Apr 20 - Thu, Apr 30
American Airlines Logo
12:16 pm - 8:40 amBOS-EAS
14h 24m2 stops
American Airlines Logo
9:20 am - 7:50 pmEAS-BOS
16h 30m1 stop
$502American Airlines
Find Deal
Sun, Feb 8 - Sun, Feb 15
American Airlines Logo
6:00 am - 8:40 amBOS-EAS
20h 40m2 stops
American Airlines Logo
1:40 pm - 10:52 pmEAS-BOS
15h 12m2 stops
$512American Airlines
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Sun, Feb 8 - Sun, Feb 15
Iberia Logo
5:10 pm - 8:40 amBOS-EAS
33h 30m2 stops
Iberia Logo
1:40 pm - 7:50 pmEAS-BOS
12h 10m1 stop
$584Iberia
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Wed, Jan 7 - Wed, Jan 21
Iberia Logo
5:10 pm - 8:40 amBOS-EAS
33h 30m2 stops
Iberia Logo
9:20 am - 10:56 pmEAS-BOS
19h 36m2 stops
$594Iberia
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Wed, Jan 7 - Wed, Jan 21

American Airlines flights from Boston to San Sebastian

Our best American Airlines deals on Boston to San Sebastian flight tickets
American Airlines
Jan 19
BOS3:35 pmBoston Logan Intl
15h 25m
2 stops
EAS1:00 pmSan Sebastián
Jan 27
EAS9:20 amSan Sebastián
11h 55m
1 stop
BOS3:15 pmBoston Logan Intl
$452
Find similar
American Airlines
Jan 19
BOS12:16 pmBoston Logan Intl
14h 24m
2 stops
EAS8:40 amSan Sebastián
Jan 27
EAS1:40 pmSan Sebastián
15h 16m
2 stops
BOS10:56 pmBoston Logan Intl
$462
Find similar
American Airlines
Feb 8
BOS12:16 pmBoston Logan Intl
14h 24m
2 stops
EAS8:40 amSan Sebastián
Feb 15
EAS9:20 amSan Sebastián
16h 30m
1 stop
BOS7:50 pmBoston Logan Intl
$502
Find similar

Iberia flights from Boston to San Sebastian

Our best Iberia deals on Boston to San Sebastian flight tickets
Iberia
Jan 19
BOS4:45 pmBoston Logan Intl
14h 15m
1 stop
EAS1:00 pmSan Sebastián
Jan 27
EAS2:05 pmSan Sebastián
12h 50m
1 stop
BOS8:55 pmBoston Logan Intl
$445
Find similar
Iberia
Feb 22
BOS9:20 pmBoston Logan Intl
17h 30m
1 stop
EAS8:50 pmSan Sebastián
Mar 4
EAS9:20 amSan Sebastián
16h 30m
1 stop
BOS7:50 pmBoston Logan Intl
$447
Find similar
Iberia
Feb 8
BOS4:45 pmBoston Logan Intl
9h 55m
1 stop
EAS8:40 amSan Sebastián
Feb 15
EAS1:40 pmSan Sebastián
12h 10m
1 stop
BOS7:50 pmBoston Logan Intl
$492
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated November 13, 2025.
Use the filters below to find and compare flights from Boston to San Sebastian that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Mon 1/19

4:45 pm-1:00 pm

1 stop14h 15m

San Sebastián

Tue 1/27

2:05 pm-8:55 pm

1 stop12h 50m

$445

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sun 2/22

9:20 pm-8:50 pm

1 stop17h 30m

San Sebastián

Wed 3/4

9:20 am-7:50 pm

1 stop16h 30m

$447

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Mon 1/19

3:35 pm-1:00 pm

2 stops15h 25m

San Sebastián

Tue 1/27

9:20 am-3:15 pm

1 stop11h 55m

$452

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Mon 1/19

12:16 pm-8:40 am

2 stops14h 24m

San Sebastián

Tue 1/27

1:40 pm-10:56 pm

2 stops15h 16m

$462

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sun 2/8

4:45 pm-8:40 am

1 stop9h 55m

San Sebastián

Sun 2/15

1:40 pm-7:50 pm

1 stop12h 10m

$492

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Mon 4/20

9:20 pm-8:50 pm

1 stop17h 30m

San Sebastián

Thu 4/30

9:20 am-4:10 pm

1 stop12h 50m

$497

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sun 2/8

12:16 pm-8:40 am

2 stops14h 24m

San Sebastián

Sun 2/15

9:20 am-7:50 pm

1 stop16h 30m

$502

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Sun 2/8

6:00 am-8:40 am

2 stops20h 40m

San Sebastián

Sun 2/15

1:40 pm-10:52 pm

2 stops15h 12m

$512

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Wed 1/7

5:10 pm-8:40 am

2 stops33h 30m

San Sebastián

Wed 1/21

1:40 pm-7:50 pm

1 stop12h 10m

$584

BostonSan Sebastian

BOS - EAS

BOSEAS

Boston Logan Intl

Wed 1/7

5:10 pm-8:40 am

2 stops33h 30m

San Sebastián

Wed 1/21

9:20 am-10:56 pm

2 stops19h 36m

$594

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to San Sebastian from

How to get the cheapest flight ticket from Boston to San Sebastian

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to San Sebastian?

The month of November is, on average, the cheapest month to fly to San Sebastian from Boston, with most prices found around $517. If you are unable to visit San Sebastian during the month of November, then departing from Boston during the month September is also very affordable. Most momondo users find prices during this month for around $547.

What is the cheapest day to depart on your flight to San Sebastian?

On average, the least expensive day to fly to San Sebastian from Boston is on a Thursday. momondo users have found tickets for Thursday departures for as low as $649. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Boston to San Sebastian for around $1,316.

What is the cheapest time of day to depart on your flight to San Sebastian?

Flying to San Sebastian from Boston in the morning is the least expensive time of day to depart. momondo users have found prices as low as $822 when looking at flights departing in the morning. Flights to San Sebastian are more costly in the evening, with an average ticket price of $986. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Boston to San Sebastian

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to San Sebastian according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Boston to San Sebastian (BOS to EAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to San Sebastian

Direct flights

None
There are no direct flights from Boston to San Sebastian. There are no popular flight routes from Boston to San Sebastian.
Search flight deals

  • How far is Boston Logan Intl to San Sebastián by plane?

    The straight-line distance from Boston Logan Intl to San Sebastián is 3393.2 mi. Flights usually cover this in 9h 40m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to San Sebastián Airport?

    Prices for flights from Boston Logan Intl Airport to San Sebastián Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Boston Logan Intl Airport to San Sebastián Airport?

  • How old do you have to be to fly from Boston Logan Intl Airport to San Sebastián Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Boston Logan Intl Airport to San Sebastián Airport.

  • What documentation or ID do you need to fly to San Sebastián Airport?

    The necessary travel and health documents for your San Sebastián Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Boston to San Sebastian?

Best airlines flying from Boston to San Sebastian

Compare and see reviews for airlines that fly from Boston to San Sebastian with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $450Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
IberiaPriceFrom $522Free CancellationRating
7.0
3,010 reviews
Search Iberia flights

Traveling to a place near San Sebastian?

Book flights to San Sebastian if you plan to visit one of these locations
Irun
Hondarribia

Why use momondo?

Why should I use momondo to find a flight deal from Boston to San Sebastian?

Finding the right flight to San Sebastian from Boston is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to San Sebastian quick and easy, saving you time and money.

Can I find flights from Boston to San Sebastian with flexible booking policies on momondo?

All flight searches from Boston to San Sebastian on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Boston to San Sebastian?

Once all potential Boston to San Sebastian flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Boston to San Sebastian right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Boston to San Sebastian flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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