BOS - EAS

$416 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 4/13. 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
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Everything you should know

Cheapest round-trip
$453
Typical prices: $711-$880
American Airlines
Mon 4/13Wed 4/29
BOS - EAS • 1 stop
Cheapest one-way
$635
American Airlines
Wed 8/5
BOS - EAS • 1 stop
Top airlines
American Airlines
Cheapest • from $453 (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 • 33% 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

Mon, Apr 13 - Wed, Apr 29
American Airlines Logo
9:20 pm - 1:00 pm
BOS
-
EAS
9h 40m
1 stop
American Airlines Logo
1:40 pm - 7:50 pm
EAS
-
BOS
12h 10m
1 stop
$453American Airlines
Tue, Mar 31 - Tue, Apr 7
Multiple Airlines Logo
12:15 pm - 8:40 am
BOS
-
EAS
14h 25m
2 stops
Multiple Airlines Logo
9:30 pm - 4:10 pm
EAS
-
BOS
24h 40m
1 stop
$495Multiple Airlines
Tue, Mar 31 - Tue, Apr 7
Iberia Logo
10:50 pm - 8:35 am
BOS
-
EAS
27h 45m
1 stop
Iberia Logo
9:30 pm - 7:50 pm
EAS
-
BOS
28h 20m
1 stop
$616Iberia
Mon, Apr 13 - Wed, Apr 29
Multiple Airlines Logo
10:45 pm - 8:20 am
BOS
-
EAS
27h 35m
3 stops
Multiple Airlines Logo
5:55 pm - 8:45 pm
EAS
-
BOS
32h 50m
3 stops
$658Multiple Airlines
Mon, Apr 13 - Wed, Apr 29
Iberia Logo
11:34 am - 8:40 am
BOS
-
EAS
15h 06m
2 stops
Iberia Logo
9:30 pm - 9:05 pm
EAS
-
BOS
29h 35m
2 stops
$662Iberia
Thu, Apr 2 - Thu, Apr 9
Iberia Logo
10:50 pm - 8:20 am
BOS
-
EAS
27h 30m
1 stop
Iberia Logo
9:20 am - 4:10 pm
EAS
-
BOS
12h 50m
1 stop
$665Iberia
Mon, Apr 13 - Wed, Apr 29
Multiple Airlines Logo
11:00 pm - 8:20 am
BOS
-
EAS
27h 20m
3 stops
Multiple Airlines Logo
5:55 pm - 8:45 pm
EAS
-
BOS
32h 50m
2 stops
$685Multiple Airlines
Tue, Jul 7 - Fri, Jul 24
Iberia Logo
9:20 pm - 1:00 pm
BOS
-
EAS
9h 40m
1 stop
Iberia Logo
9:20 am - 9:15 pm
EAS
-
BOS
17h 55m
2 stops
$720Iberia
Sun, May 17 - Sun, May 31
Iberia Logo
11:34 am - 8:40 am
BOS
-
EAS
15h 06m
2 stops
Iberia Logo
9:30 pm - 4:10 pm
EAS
-
BOS
24h 40m
1 stop
$732Iberia
Wed, Apr 15 - Fri, Apr 24
Iberia Logo
11:34 am - 8:40 am
BOS
-
EAS
15h 06m
2 stops
Iberia Logo
1:40 pm - 11:52 pm
EAS
-
BOS
16h 12m
2 stops
$751Iberia
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 $970 respectively.

Good to know

Low seasonJanuary
Cheapest flight$453
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 $635 for a one-way ticket and $453 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 $775 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 11304 reviews
8.0Crew
6.4Food
7.2Comfort
7.5Boarding
6.9Entertainment
Airline reviews

See prior comment about how Kayak mishandled my reservation and delayed my arrival by 6 hours.

10.0 ExcellentJeffrey, Feb 2026
ORD - DFW
Read more American Airlines reviews

See prior comment about how Kayak mishandled my reservation and delayed my arrival by 6 hours.

American Airlines was great and worked very hard to change my ticket so I could get an earlier, direct flight back to Dallas. However, I was informed that Kayak made mistakes with my itinerary and classified my ticket as desiring to be on the earlier flight instead of taking the necessary step of calling AA to get me on the standby list. This ended up keeping me from being added to the standby list and delayed me getting home by 6 hours. I am happy to discuss this further with Kayak so they can correct their procedures so this won't happen again.

The flight was fine. It's the satellite terminal that supports American eagle flights is what sucks. There is only one food option and everything there is way overpriced. I mean I know it's airport pricing, but it's even crazier than that. I bought a sandwich in a plastic container for $18.

Overall it was a good flight. Because we traveled on a Saturday we were upgraded to FC since my wife and I are both Executive Platinum. The only areas for improvement we noted are better snack assortment and perhaps a little nicer plane as American is flying some older planes now. Everything else on this flight was excellent, which is frankly not the norm for American since we have had multiple issues on prior AA flights.

The smell from the bathroom kept wafting through the cabin. It made people sick.

The flight was really crowded. Flight attendants were just ok.

Boarding delayed 20 minutes for no reason, no wifi, in flight entertainment, or snacks / waters?

Didn't get a seat assignment until the last minute even though i picked a seat.

American has been able to implement an algorithm that makes it possible for nearly every one of my evening flights to be late. Congratulations!

I was on a small regional flight from Detroit to Philadelphia. When we landed the outside cruise needed to turn something off with the engine, which took quite a long time. Then, when they allowed us to get off the plane it was outside. They took their time, unloading all the luggage and waited till they unloaded all the luggage before they brought it over to us. It was 9 o’clock at night freezing cold out, and there was no proactive hustle to try to get people their luggage. It was really one of the worst experiences I think I’ve ever had with American until a manager came over. I don’t think they were going to even consider pulling the luggage over to the people that had been waiting outside for at least 10 minutes in the freezing cold.

The flight was canceled on a Thursday last minute. I lost thousands of dollars in hotels and car rental

Excellent lie flat seat for premium economy! Great staff. Bad food . Not so great entertainment. My bag didn’t make it either.

Really like the idea experience on this airline I will use again

The pilot was professional and very good. The flight crew, very young and often looked flustered and overwhelmed. The seats were among the most uncomfortable in the air. The boarding somewhat chaotic. The price reasonable. Overall it was an average budget airline experience...although Iberia is not a budget airline. I fear if Iberia doesn't up it's game customers like us will go elsewhere.

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.

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

Information on your arrival and departure airports