$571+ 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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAS
Jan 11 — Jan 181
1 adult, Economy
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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
Best flights from Seattle to San SebastianDiscover carefully curated flight deals from Seattle to San Sebastian that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.
Discover carefully curated flight deals from Seattle to San Sebastian that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.
This Iberia deal was found by Cheapflights users on 12/11. 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 1/2510:50 amSEA - EAS
2 stops25h 00mIberia
Sun 2/19:20 amEAS - SEA
2 stops21h 39mIberia
Deal found 12/11![Iberia logo]()
$582
This Mytrip deal was found by Cheapflights users on 12/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/255:50 amSEA - EAS
3 stops22h 40mMultiple Airlines
Sun 2/12:05 pmEAS - SEA
3 stops31h 05mMultiple Airlines
Deal found 12/11![Multiple Airlines logo]()
$1,189
This Iberia deal was found by Cheapflights users on 12/10. 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.
Fri 2/66:50 pmSEA - EAS
2 stops17h 00mIberia
Tue 2/109:20 amEAS - SEA
2 stops20h 36mIberia
Deal found 12/10![Iberia logo]()
$802
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 December 12, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $582 (Iberia) |
One-way from | $571 (Trip.com) |
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 December 12, 2025.
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
Sun 1/25
10:50 am-8:50 pm
2 stops25h 00m
San Sebastián
Sun 2/1
9:20 am-9:59 pm
2 stops21h 39m
$582
SeattleSan Sebastian
SEA - EAS
SEAEAS
Seattle/Tacoma Intl
Fri 2/6
6:50 pm-8:50 pm
2 stops17h 00m
San Sebastián
Tue 2/10
9:20 am-8:56 pm
2 stops20h 36m
$802
SeattleSan Sebastian
SEA - EAS
SEAEAS
Seattle/Tacoma Intl
Sun 1/25
5:50 am-1:30 pm
3 stops22h 40m
San Sebastián
Sun 2/1
2:05 pm-12:10 pm
3 stops31h 05m
$1,189
SeattleSan Sebastian
SEA - EAS
SEAEAS
Seattle/Tacoma Intl
Sun 6/7
1:35 pm-8:50 pm
2 stops22h 15m
$571
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 December.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Seattle-San Sebastian flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-San Sebastian flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.
What is the cheapest time of day to fly from SEA to EAS?
Find hourly flight availability from Seattle to San Sebastian. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 12, 2025.
When flying from Seattle to San Sebastian, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 55% versus a flight in the morning.