BOS - EAS

$338 Find Cheap Flights from Boston to San Sebastian - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to San Sebastian departing on 8/29. 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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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$631
Typical prices: $631-$968
Multiple Airlines
Sun 8/16Wed 9/16
BOS - EAS • 1 stop
Cheapest one-way
$338
Multiple Airlines
Sat 8/29
BOS - EAS • 3 stops
Top airlines
Cheapest • from $838 (round-trip)
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Boston and San Sebastian. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $913 (round-trip)
Shortest trip • 11h 14m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 40% price drop
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, Aug 16 - Wed, Sep 16
Multiple Airlines Logo
11:35 pm - 8:20 am
BOS
-
EAS
26h 45m
1 stop
Multiple Airlines Logo
5:55 pm - 9:05 pm
EAS
-
BOS
33h 10m
1 stop
$631Multiple Airlines
Thu, Aug 20 - Thu, Sep 3
Multiple Airlines Logo
9:15 pm - 8:20 am
BOS
-
EAS
29h 05m
2 stops
Multiple Airlines Logo
9:05 am - 9:05 pm
EAS
-
BOS
18h 00m
1 stop
$668Multiple Airlines
Thu, Aug 20 - Thu, Sep 3
Multiple Airlines Logo
7:10 pm - 8:40 am
BOS
-
EAS
31h 30m
2 stops
Multiple Airlines Logo
9:05 am - 9:05 pm
EAS
-
BOS
18h 00m
1 stop
$709Multiple Airlines
Sun, Aug 16 - Wed, Sep 16
Multiple Airlines Logo
11:35 pm - 8:20 am
BOS
-
EAS
26h 45m
1 stop
Multiple Airlines Logo
10:10 am - 9:05 pm
EAS
-
BOS
16h 55m
2 stops
$719Multiple Airlines
Thu, Aug 20 - Thu, Sep 3
Multiple Airlines Logo
11:35 pm - 5:20 pm
BOS
-
EAS
11h 45m
1 stop
Multiple Airlines Logo
9:05 am - 9:05 pm
EAS
-
BOS
18h 00m
1 stop
$728Multiple Airlines
Thu, Sep 17 - Wed, Sep 23
Multiple Airlines Logo
10:55 pm - 8:20 am
BOS
-
EAS
27h 25m
1 stop
Multiple Airlines Logo
8:55 am - 9:05 pm
EAS
-
BOS
18h 10m
1 stop
$792Multiple Airlines
Thu, Aug 20 - Thu, Sep 3
Multiple Airlines Logo
11:35 pm - 5:20 pm
BOS
-
EAS
11h 45m
1 stop
Multiple Airlines Logo
9:05 am - 9:05 pm
EAS
-
BOS
18h 00m
1 stop
$826Multiple Airlines
Sun, Aug 16 - Wed, Sep 16
Multiple Airlines Logo
8:50 pm - 8:20 am
BOS
-
EAS
29h 30m
3 stops
Multiple Airlines Logo
5:55 pm - 8:20 pm
EAS
-
BOS
32h 25m
2 stops
$835Multiple Airlines
Sun, Oct 18 - Wed, Oct 21
Iberia Logo
11:35 pm - 8:20 am
BOS
-
EAS
26h 45m
1 stop
Iberia Logo
9:30 pm - 7:50 pm
EAS
-
BOS
28h 20m
1 stop
$838Iberia
Sun, Oct 4 - Wed, Oct 7
Iberia Logo
11:35 pm - 8:20 am
BOS
-
EAS
26h 45m
1 stop
Iberia Logo
9:30 pm - 4:10 pm
EAS
-
BOS
24h 40m
1 stop
$844Iberia
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.

How much is a round-trip flight from Boston to San Sebastian?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Boston to San Sebastian departing in August.

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 July and December, where the average cost of round-trip tickets is $1,628 and $1,211 respectively.

Good to know

Low seasonJanuary
Cheapest flight$338
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly and prices are also 19% 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 5 days, the lowest price for a flight from Boston to San Sebastian was $338 for a one-way ticket and $631 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 $697 and an overall rating of 7.1, American Airlines is the most popular choice. Iberia is also a great choice for the route, with an average price of $749 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.
7.1
American AirlinesOverall score based on 11779 reviews
6.4Food
7.5Boarding
6.8Entertainment
7.2Comfort
7.9Crew
Airline reviews

Because I bought my ticket from Underpricer, I could not check in online. I could only check in at the airport and that was deeply frustrating because I had to arrive very early. The flight also departed 45 min late and passengers were given no explanations about why we were delayed. I was worried I would miss my connecting flight. Once on board, however, the flight was fine.

10.0 ExcellentAnonymous, Jun 2026
BOS - MAD
Read more American Airlines reviews

Because I bought my ticket from Underpricer, I could not check in online. I could only check in at the airport and that was deeply frustrating because I had to arrive very early. The flight also departed 45 min late and passengers were given no explanations about why we were delayed. I was worried I would miss my connecting flight. Once on board, however, the flight was fine.

Terrible boarding and first class experience. Nice staff but overall disorganized, dirty plane.

The flight was delayed significantly and we sat on runway after landing for awhile. Best thing was the flight attendant, Jenny, in first class, who was very professional and attentive. She was excellent - the rest of the flight was not.

Early departure meant on time arrival. Only real problem was free internet had issues, although chatting with the internet help desk (you can do this via aainflight.com) got the issue resolved.

The staff and service on American Airlines were truly outstanding. I had requested wheelchair assistance for my mother due to her knee issues, and the team went above and beyond every step of the way—from boarding in Boston to our arrival in Chicago. Their care, professionalism, and attentiveness made the entire experience smooth and stress-free. I’m very grateful for the support they provided.

Found that the plane used for this short flight is smaller and therefore the seats are really squeezed tight.

Tv screens and movie selection v good. Friendly staff. They were really worried about max capacity and room for carryons. That is never fun but i had no problem finding space when I boarded.

Great experience. Good dinner and service. FA's were very nice and attentive.

Jill was the flight attendant in first class she was fabulous!! Best flight attendant I have had in years.!! And I fly every other week. Other can learn from her!!

The business steward was absolutely amazing! Smiles and kindness! Wish all AA flights are like this one!

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

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

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

We liked the flight but while we purchased an aisle seat, our seats had a different configuration on this flight. A fellow passenger suggested that the airplane had been changed. Too bad we were not informed and had no chance to modify our seat preferences. We were stuck in the window and middle seats with no chance to walk around and go to the bathroom without disturbing our sleeping fellow passenger.

Moved the flight an hour later, were not reliable about confirmation, website didn't work, no gate information, boarding was a mad house. Flight itself was fine and short. Organization needs work.

Not having to check carry on bags when plane wasn’t full. (The told us it was)

The connection required us to travel from terminal A to terminal E with very little time in between flights. While waiting in line, we were called to the service desk to provide our passports. We provided our passports at time of check in, assuming that American Airlines doesn’t communicate well with Iberia, this was a headache.

First flight was 5.5 hours delayed, the notification came within 2 hours of the flight (bags already checked in). connection missed- no one working on getting us on an alternate flight, knowing where our luggage will be. It was chaos figuring out how to get to our final destination. Customer service throwing us into nowhere on the phone- all while we have 2 small kids on us. It will take the whole vacation to recover from this experience. I am scared how the return flight will go in August. Check-in staff (not sure if they are airport hires or iberia hires- beyond rude, especially in Madrid.) On-plane staff, food and entertainment were good.

When I bought the ticket, right away I got a problem, I had to cancel. Unfortunately never ever I will use kayak or Iberia again. When trying to cancel kayak told me to talk directly with the airline, the airline talked to me through whatsap and told me to deal through kayak. Both of u never took responsibility in helping me out. You kayak did not want to deal with me. I called my credit card and now we r disputing the charge bc u have a pathetic customer service.

I didn't expect food on this flight but they give us breakfast, they also check in our hand baggage for free

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

Information on your arrival and departure airports