HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Sebastian

$532+ Cheap flights from St. Louis (STL) to San Sebastian (EAS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — EAS
Jan 1 — Jan 81
Thu 1/1
Thu 1/8
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis 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 St. Louis to San Sebastian

Best flights from St. Louis to San Sebastian
Discover carefully curated flight deals from St. Louis to San Sebastian that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 2, 2025.

This American Airlines deal was found by Cheapflights users on 12/1. 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 2/18:13 amSTL - EAS
2 stops17h 27mAmerican Airlines
Tue 2/109:20 amEAS - STL
2 stops18h 55mAmerican Airlines
Deal found 12/1$532
This American Airlines deal was found by Cheapflights users on 11/29. 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.
Fri 2/61:35 pmSTL - EAS
2 stops24h 15mAmerican Airlines
Tue 2/109:20 amEAS - STL
2 stops30h 48mAmerican Airlines
Deal found 11/29$757

Find flight deals from St. Louis to San Sebastian

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) 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 2, 2025.

Most accurate provider

Expedia
2 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$532
(American Airlines)
Provider with most accurate pricing for Lambert-St Louis-San Sebastián flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-San Sebastián flights.
Search Deals
From Lambert-St Louis to San Sebastián
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis 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 2, 2025.
Use the filters below to find and compare flights from St. Louis to San Sebastian that are best for you.

Fly from

St. Louis

Fly to

San Sebastian

Route

Depart

Return

Price

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Sun 2/1

8:13 am-8:40 am

2 stops17h 27m

San Sebastián

Tue 2/10

9:20 am-9:15 pm

2 stops18h 55m

$532

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Fri 2/6

1:35 pm-8:50 pm

2 stops24h 15m

San Sebastián

Tue 2/10

9:20 am-9:08 am

2 stops30h 48m

$757

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/1

  • Most accurate provider: When it comes to deals on St. Louis-San Sebastian flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on St. Louis-San Sebastian flight deals on Cheapflights vs. Expedia 90-95% of the time. Price accuracy is based on data collected from St. Louis-San Sebastian flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-San Sebastian flights, Cheapflights users trust Expedia the most. Expedia 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 St. Louis-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 St. Louis to San Sebastian

Have a flexible travel schedule? Discover the best time to fly to San Sebastian from St. Louis 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.

Related info for your journey

Find useful and relevant information for your journey from St. Louis 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 St. Louis to San Sebastian?

    There are many flights that can get you from St. Louis to San Sebastian in 17h 27m. Fly via American Airlines to get the fastest option. St. Louis and San Sebastian are separated by a distance of 4395 mi.

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

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

  • How can I find direct flights from St. Louis to San Sebastian?

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

  • Can I find deals for business class flights from St. Louis to San Sebastian?

    Yes. Cheapflights offers flight deals from St. Louis 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.

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 St. Louis to San Sebastian

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis 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.