HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Sebastian

$401+ Cheap flights from Seattle (SEA) to San Sebastian (EAS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/28. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAS
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to San Sebastian with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Seattle to San Sebastian

Cheapest flights from Seattle to San Sebastian
Explore the most affordable flight options available from Seattle to San Sebastian. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This Expedia deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1411:41 am
SEA
-
EAS
2 stops24h 09m
Iberia
Thu 4/231:40 pm
EAS
-
SEA
2 stops20h 04m
Iberia
Deal found 1/28$544
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/2810:08 pm
SEA
-
EAS
2 stops25h 32m
American Airlines
Sat 5/21:40 pm
EAS
-
SEA
2 stops20h 04m
American Airlines
Deal found 1/28$714
This KAYAK deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/137:00 am
SEA
-
EAS
2 stops21h 00m
Iberia
Fri 4/241:40 pm
EAS
-
SEA
2 stops20h 04m
Iberia
Deal found 1/28$763
This KAYAK deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/137:00 am
SEA
-
EAS
2 stops21h 00m
Iberia
Thu 4/231:40 pm
EAS
-
SEA
2 stops20h 04m
Iberia
Deal found 1/28$776
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1211:26 pm
SEA
-
EAS
2 stops28h 34m
American Airlines
Wed 4/221:40 pm
EAS
-
SEA
2 stops20h 04m
American Airlines
Deal found 1/28$786
This Iberia deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/127:00 am
SEA
-
EAS
2 stops21h 00m
Iberia
Thu 4/239:20 am
EAS
-
SEA
2 stops22h 27m
Iberia
Deal found 1/28$814
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1111:55 pm
SEA
-
EAS
2 stops47h 45m
American Airlines
Wed 4/221:40 pm
EAS
-
SEA
2 stops20h 04m
American Airlines
Deal found 1/28$844
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:00 am
SEA
-
EAS
2 stops21h 00m
American Airlines
Wed 4/221:40 pm
EAS
-
SEA
2 stops41h 46m
American Airlines
Deal found 1/28$848
This Iberia deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/127:00 am
SEA
-
EAS
2 stops21h 00m
Iberia
Mon 4/209:20 am
EAS
-
SEA
2 stops23h 19m
Iberia
Deal found 1/28$864
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1111:55 pm
SEA
-
EAS
2 stops47h 45m
American Airlines
Thu 4/231:40 pm
EAS
-
SEA
2 stops20h 04m
American Airlines
Deal found 1/28$891
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:00 am
SEA
-
EAS
2 stops40h 40m
American Airlines
Tue 4/211:40 pm
EAS
-
SEA
2 stops28h 55m
American Airlines
Deal found 1/28$895
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1210:29 pm
SEA
-
EAS
2 stops25h 11m
American Airlines
Sun 4/261:40 pm
EAS
-
SEA
2 stops40h 24m
American Airlines
Deal found 1/28$896

Find flight deals from Seattle to San Sebastian

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to San Sebastian (EAS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$544
(Expedia)

One-way from

$401
(Kiwi.com)
Provider with most accurate pricing for Seattle/Tacoma Intl-San Sebastián flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-San Sebastián flights.
Search Deals
From Seattle/Tacoma Intl to San Sebastián
Search Deals
One-way flight from Seattle/Tacoma Intl to San Sebastián
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle 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, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Seattle to San Sebastian that are best for you.

Fly from

Seattle

Fly to

San Sebastian

Route

Depart

Return

Price

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Tue 4/14

11:41 am-8:50 pm

2 stops24h 09m

San Sebastián

Thu 4/23

1:40 pm-12:44 am

2 stops20h 04m

$544

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Sat 3/28

10:08 pm-8:40 am

2 stops25h 32m

San Sebastián

Sat 5/2

1:40 pm-12:44 am

2 stops20h 04m

$714

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Mon 4/13

7:00 am-1:00 pm

2 stops21h 00m

San Sebastián

Wed 4/22

1:40 pm-12:44 am

2 stops20h 04m

$763

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Mon 4/13

7:00 am-1:00 pm

2 stops21h 00m

San Sebastián

Thu 4/23

1:40 pm-12:44 am

2 stops20h 04m

$776

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Tue 4/14

6:00 am-8:40 am

2 stops17h 40m

San Sebastián

Tue 4/21

1:40 pm-9:35 am

2 stops28h 55m

$786

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Tue 4/14

6:00 am-8:40 am

2 stops17h 40m

San Sebastián

Wed 4/22

1:40 pm-12:44 am

2 stops20h 04m

$786

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Mon 4/13

10:25 am-1:00 pm

2 stops17h 35m

San Sebastián

Tue 4/21

1:40 pm-9:35 am

2 stops28h 55m

$786

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Sat 4/11

11:55 pm-8:40 am

2 stops47h 45m

San Sebastián

Tue 4/21

1:40 pm-9:35 am

2 stops28h 55m

$844

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Thu 4/16

7:00 am-1:00 pm

2 stops21h 00m

San Sebastián

Tue 4/21

1:40 pm-10:26 pm

2 stops41h 46m

$848

SeattleSan Sebastian

SEA - EAS

SEAEAS

Seattle/Tacoma Intl

Tue 4/14

6:00 am-8:40 am

2 stops17h 40m

San Sebastián

Sun 4/26

1:40 pm-7:28 pm

2 stops38h 48m

$848

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 19 results
1
2

Compare providers for flights from Seattle to San Sebastian

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to San Sebastian in January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-San Sebastian flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-San Sebastian flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-San Sebastian flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-San Sebastian flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-San Sebastian flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to San Sebastian

Have a flexible travel schedule? Discover the best time to fly to San Sebastian from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to San Sebastian

What is the cheapest month to book a flight from Seattle to San Sebastian?

Currently, January is the cheapest month in which you can book a flight from Seattle to San Sebastian (average of $484). Flying from Seattle to San Sebastian in June is currently the most expensive (average of $1,288). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Seattle to San Sebastian. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to San Sebastian?

    There are many flights that can get you from Seattle to San Sebastian in 24h 09m. Fly via Iberia or American Airlines to get the fastest option. There are 5190 mi between Seattle and San Sebastian. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Seattle to San Sebastian that include hotel bookings?

    Yes. In addition to deals on Seattle to San Sebastian flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to San Sebastian?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to San Sebastian.

  • Can I find deals for business class flights from Seattle to San Sebastian?

    Yes. Cheapflights offers flight deals from Seattle to San Sebastian by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to San Sebastian?

    Currently, January is the cheapest month in which you can book a flight from Seattle to San Sebastian (average of $484). Flying from Seattle to San Sebastian in June is currently the most expensive (average of $1,288). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to San Sebastian

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Bilbao flights
Portland to Bilbao flights
Pasco to Bilbao flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.