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$782+ 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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
STL — EAS
Dec 25 — Jan 11
Thu 12/25
Thu 1/1
1 adult, Economy
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Find 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 November 25, 2025.

This American Airlines deal was found by Cheapflights users on 11/23. 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 1/2112:11 pmSTL - EAS
2 stops25h 39mAmerican Airlines
Sun 1/259:20 amEAS - STL
2 stops30h 43mAmerican Airlines
Deal found 11/23$782
This Orbitz deal was found by Cheapflights users on 11/24. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/238:06 pmSTL - EAS
2 stops41h 44mIberia
Sat 5/309:30 pmEAS - STL
2 stops43h 01mIberia
Deal found 11/24$1,298
This Mytrip deal was found by Cheapflights users on 11/24. 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.
Sat 5/231:30 pmSTL - EAS
3 stops35h 50mMultiple Airlines
Sat 5/308:55 amEAS - STL
3 stops35h 35mMultiple Airlines
Deal found 11/24$1,952
This American Airlines deal was found by Cheapflights users on 11/24. 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 5/2310:01 amSTL - EAS
2 stops19h 59mAmerican Airlines
Sat 5/309:20 amEAS - STL
2 stops17h 42mAmerican Airlines
Deal found 11/24$1,421

Cheap 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 November 25, 2025.

Most accurate provider

Expedia
2 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$782
(American Airlines)
Provider with most accurate pricing for Lambert-St Louis-San Sebastián flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-San Sebastián flights.
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From Lambert-St Louis to San Sebastián
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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 November 25, 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

Wed 1/21

12:11 pm-8:50 pm

2 stops25h 39m

San Sebastián

Sun 1/25

9:20 am-9:03 am

2 stops30h 43m

$782

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Sat 5/23

8:06 pm-8:50 pm

2 stops41h 44m

San Sebastián

Sat 5/30

9:30 pm-9:31 am

2 stops43h 01m

$1,298

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Sat 5/23

10:01 am-1:00 pm

2 stops19h 59m

San Sebastián

Sat 5/30

9:20 am-8:02 pm

2 stops17h 42m

$1,421

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Sat 5/23

1:30 pm-8:20 am

3 stops35h 50m

San Sebastián

Sat 5/30

8:55 am-1:30 pm

3 stops35h 35m

$1,952

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/23

  • 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 25h 39m. Fly via American Airlines or Iberia to get the fastest option. St. Louis and San Sebastian are separated by a distance of 4395 mi. This flight may include one or multiple stops.

  • 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.

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