BOS - EAS

$351 Find Cheap Flights from Boston to San Sebastian

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to San Sebastian departing on 2/22. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to San Sebastian

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to San Sebastian, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to San Sebastian, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$452
Overall average: $697
Iberia
Sun 2/22Tue 3/10
BOS - EAS • 1 stop
Cheapest one-way
$504
Multiple Airlines
Thu 5/28
BOS - EAS • 2 stops
Top airlines
Iberia
Cheapest • from $452 (round-trip)
American Airlines
Best reviews • 7.2 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
November
Cheapest • 34% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Sebastian!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Boston to San Sebastian (BOS-EAS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to San Sebastian that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boston to San Sebastian

Sun, Feb 22 - Tue, Mar 10
Iberia Logo
9:20 pm - 8:50 pm
BOS
-
EAS
17h 30m
1 stop
Iberia Logo
2:05 pm - 9:55 pm
EAS
-
BOS
12h 50m
1 stop
$452Iberia
Sun, Feb 22 - Tue, Mar 10
Iberia Logo
9:20 pm - 8:50 pm
BOS
-
EAS
17h 30m
1 stop
Iberia Logo
9:20 am - 7:19 pm
EAS
-
BOS
14h 59m
2 stops
$465Iberia
Tue, Apr 21 - Tue, Apr 28
Iberia Logo
10:50 pm - 8:50 pm
BOS
-
EAS
16h 00m
2 stops
Iberia Logo
5:55 pm - 9:05 pm
EAS
-
BOS
33h 10m
1 stop
$469Iberia
Tue, Apr 21 - Mon, Apr 27
Iberia Logo
10:50 pm - 8:50 pm
BOS
-
EAS
16h 00m
2 stops
Iberia Logo
9:30 pm - 9:05 pm
EAS
-
BOS
29h 35m
2 stops
$476Iberia
Sun, Feb 22 - Tue, Mar 10
American Airlines Logo
5:15 pm - 1:00 pm
BOS
-
EAS
13h 45m
2 stops
American Airlines Logo
9:20 am - 7:19 pm
EAS
-
BOS
14h 59m
2 stops
$485American Airlines
Tue, Apr 21 - Tue, Apr 28
Iberia Logo
10:50 pm - 8:35 am
BOS
-
EAS
27h 45m
1 stop
Iberia Logo
5:55 pm - 9:05 pm
EAS
-
BOS
33h 10m
1 stop
$488Iberia
Tue, Apr 21 - Mon, Apr 27
Iberia Logo
10:50 pm - 8:35 am
BOS
-
EAS
27h 45m
1 stop
Iberia Logo
9:30 pm - 9:05 pm
EAS
-
BOS
29h 35m
2 stops
$494Iberia
Tue, Apr 21 - Mon, Apr 27
Iberia Logo
10:50 pm - 5:20 pm
BOS
-
EAS
12h 30m
1 stop
Iberia Logo
5:55 pm - 9:05 pm
EAS
-
BOS
33h 10m
1 stop
$513Iberia
Sun, Mar 15 - Sun, Mar 22
Iberia Logo
5:45 pm - 8:40 am
BOS
-
EAS
9h 55m
1 stop
Iberia Logo
9:30 pm - 8:50 pm
EAS
-
BOS
28h 20m
1 stop
$519Iberia
Sun, Mar 15 - Sun, Mar 22
Iberia Logo
6:53 pm - 8:40 am
BOS
-
EAS
56h 47m
2 stops
Iberia Logo
9:30 pm - 8:50 pm
EAS
-
BOS
28h 20m
1 stop
$544Iberia
Booking Insights

KAYAK's insights & trends for Boston to San Sebastian flights

Get data-powered insights and trends into flights from Boston to San Sebastian to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Boston to San Sebastian?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boston to San Sebastian, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Boston to San Sebastian is November, where tickets cost $517 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,211 and $1,064 respectively.

Good to know

Low seasonJanuary
Cheapest flight$452
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly and prices are also 13% lower on average.
Flight from Boston to San Sebastian

When to book flights from Boston to San Sebastian

Are your dates flexible? Find out the best times to travel from Boston to San Sebastian based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Boston to San Sebastian

  • What is the cheapest flight from Boston to San Sebastian?

    In the last 3 days, the lowest price for a flight from Boston to San Sebastian was $504 for a one-way ticket and $452 for a round-trip.

  • Do I need a passport to fly between Boston and San Sebastian?

    Yes

  • Which aircraft models fly most regularly from Boston to San Sebastian?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Boston to San Sebastian?

    oneworld is the only airline alliance operating flights between Boston and San Sebastian.

  • Which is the best airline for flights from Boston to San Sebastian, American Airlines or Iberia?

    The two airlines most popular with KAYAK users for flights from Boston to San Sebastian are American Airlines and Iberia. With an average price for the route of $864 and an overall rating of 7.2, American Airlines is the most popular choice. Iberia is also a great choice for the route, with an average price of $808 and an overall rating of 7.0.

  • How does KAYAK find such low prices on flights from Boston to San Sebastian?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to San Sebastian.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to San Sebastian?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Sebastian from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to San Sebastian?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Sebastian with an airline and back to Boston with another airline. Booking your flights between Boston and EAS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to San Sebastian?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Sebastian from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Boston to San Sebastian

 
See real verified KAYAK customer reviews for airlines flying from Boston to San Sebastian. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boston to San Sebastian? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.2
American AirlinesOverall score based on 11197 reviews
6.9Entertainment
8.0Crew
7.5Boarding
7.2Comfort
6.4Food
Airline reviews

On time on a day with lots of weather cancellations on other flights. Thank you for getting me home during a winter storm!

10.0 ExcellentCindy, Jan 2026
MIA - BHM
Read more American Airlines reviews

On time on a day with lots of weather cancellations on other flights. Thank you for getting me home during a winter storm!

Don't change gate multiple times make people run across the airport. Announce delays in a timely manner. Have maintenance crew ready. Don't delay and keep passengers on the plane for 3 hrs. on tarmac.

The plane was experiencing problems with the HVAC system, it was very cold in the front of the plane and very hot in the back.

My flight to London from Philadelphia was cancelled due to weather.

The attendants were kind and helpful. A sugar-free drink would have been very welcome.

Pilot navigated severe weather/snow storm with skill. Described his intentions clearly

one crew said "he" didn't serve double alcohol drinks for travelers in exit rows. crew on prior flight did. Is this a AA rule, and the prior crew was being nice? Also, I think we deserve more than a 25% refund for losing first class seats when rescheduling a flight due to weather

It was a little concerning to hear the ground crew arguing with the flight crew over baggage space. Instead of taking them and checking them, they started checking for space in the first class cabin moving items around like the flight crew didn't know what they were doing. I was embarrassed for them.

2 hour delay due to equipment failure. No updates via the app and airport screens (which continued to show a departure time in the past). AA eventually switched planes and the new plane was not catered or cleaned correctly.

I booked an aisle seat and was given a middle. At 6'4" 230lbs, it is not ideal to fly in the middle row for myself and passengers.

Bad weather Excelent pilot Spoke British 😆on time seats small ad expected in a discount airline

It wasn’t great because the third-party from Kayak there was just no information about how to check in with Vueling. And the purchase of the ticket from under pricer just made everything really difficult. I’m unlikely to use Kayak again for these reasons.

It was fine, older plane with limited entertainment, otherwise fine.

the seats were bad and uncomfortable and the food was not tasty.

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

It was budget airline Veuling, even though we booked Iberia.

The staff was very nice and helpful. Some of the best crew I have met.

Bad experience. The seat room are very tight. The food is not good and the breakfast has no hot drink.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

Everything you need to know for your flight from Boston to San Sebastian

Information on your arrival and departure airports