BOS - EAS

$623 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 3/15. 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
$545
Overall average: $875
Iberia
Sun 3/15Sat 3/21
BOS - EAS • 1 stop
Cheapest one-way
Multiple Airlines
Fri 12/12
BOS - EAS • multi-stop
Top airlines
Iberia
Cheapest • from $545 (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 • 36% price drop
June
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, Mar 15 - Sat, Mar 21
Iberia Logo
5:45 pm - 8:40 am
BOS
-
EAS
9h 55m1 stop
Iberia Logo
1:40 pm - 3:20 pm
EAS
-
BOS
30h 40m2 stops
$545Iberia
Wed, Jan 14 - Sun, Jan 18
American Airlines Logo
9:45 am - 8:40 am
BOS
-
EAS
16h 55m2 stops
American Airlines Logo
1:40 pm - 10:56 pm
EAS
-
BOS
15h 16m2 stops
$549American Airlines
Wed, Apr 22 - Sun, Apr 26
American Airlines Logo
9:38 am - 8:40 am
BOS
-
EAS
17h 02m2 stops
American Airlines Logo
1:40 pm - 11:26 pm
EAS
-
BOS
15h 46m2 stops
$623American Airlines
Sun, Mar 15 - Sat, Mar 21
Iberia Logo
8:25 pm - 8:40 am
BOS
-
EAS
31h 15m2 stops
Iberia Logo
1:40 pm - 3:20 pm
EAS
-
BOS
30h 40m2 stops
$624Iberia
Sun, Mar 15 - Fri, Mar 20
Iberia Logo
5:45 pm - 8:40 am
BOS
-
EAS
9h 55m1 stop
Iberia Logo
1:40 pm - 8:50 pm
EAS
-
BOS
12h 10m1 stop
$658Iberia
Sun, Mar 15 - Sat, Mar 21
Iberia Logo
5:45 pm - 8:40 am
BOS
-
EAS
9h 55m1 stop
Iberia Logo
9:30 pm - 4:15 pm
EAS
-
BOS
23h 45m1 stop
$710Iberia
Wed, Feb 4 - Sun, Feb 8
Iberia Logo
9:20 pm - 1:00 pm
BOS
-
EAS
9h 40m1 stop
Iberia Logo
1:40 pm - 7:50 pm
EAS
-
BOS
12h 10m1 stop
$726Iberia
Wed, Feb 4 - Sun, Feb 8
Iberia Logo
5:10 pm - 1:00 pm
BOS
-
EAS
13h 50m2 stops
Iberia Logo
9:20 am - 3:15 pm
EAS
-
BOS
11h 55m1 stop
$730Iberia
Wed, Apr 22 - Sun, Apr 26
American Airlines Logo
9:20 pm - 1:00 pm
BOS
-
EAS
9h 40m1 stop
American Airlines Logo
1:40 pm - 11:26 pm
EAS
-
BOS
15h 46m2 stops
$738American Airlines
Wed, Feb 4 - Sun, Feb 8
Iberia Logo
5:10 pm - 1:00 pm
BOS
-
EAS
13h 50m2 stops
Iberia Logo
1:40 pm - 10:56 pm
EAS
-
BOS
15h 16m2 stops
$740Iberia
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$545
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly with an average 32% increase in price.
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 $623 for a round-trip ticket.

  • 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 $868 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 $828 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 11049 reviews
8.0Crew
6.9Entertainment
7.5Boarding
6.5Food
7.2Comfort
Airline reviews

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

8.0 ExcellentConnie, Dec 2025
PHX - MKE
Read more American Airlines reviews

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Waaay too small plane. They also need to up the size of the overhead bins. I would love to keep me 3k with of camera equipment in my hard case baggahe instead of it being thrown into the belly of the plane

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

It was fine. No drinks nor snacks offered though. I thought that was unusual.

I liked the humor of the captain and crew on the flight from Flagstaff to Dallas. They were humorous.

AA delayed the flight for 3 hours and 50 minutes, but delayed the last 2 hours, 30 minutes at a time, so if we knew before, could have stayed at home and worked instead of being at the airport wasting time... The plane's crew was excellent, not their fault.

After arriving in Dallas, the aircraft taxied for an unusually long time and was unable to park at the gate, which caused a significant delay and made me miss my connecting flight. I then had to wait in a very long line to be rebooked, and I was told that no hotel or meal accommodations would be provided. What is even more unacceptable is that my luggage was mishandled and has still not been located. My suitcase contains important medications that I urgently need, and I have been unable to access them due to the airline’s mishandling. This situation has caused me considerable stress and inconvenience, and I need this issue to be resolved immediately.

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

Great : The crew was awesome ♥️ To improve : - The rice in the "Rice with chicken" was rather s kind of rice pudding, not good at all - No power outlet to charge your phone. 😒

The food on the flight was of marginal quality. Small bits of chicken, instant mashed potatoes and some carrots. The rolls were very dry, nearly inedible. The seats were quite small and didn’t allow for any shifting of position during the flight. There was limited leg room.0

It was a good flight overall. Nothing to add. Keep it up!

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

Information on your arrival and departure airports