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Cheap flights from St. Louis to San Sebastian from $954

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to San Sebastian departing on 10/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from St. Louis to San Sebastian

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
5:00 am - 1:00 pm
STL
-
EAS
25h 00m
2 stops
Multiple Airlines Logo
9:20 am - 9:56 pm
EAS
-
STL
19h 36m
2 stops
$954Multiple Airlines
Mon, Oct 5 - Sat, Oct 17
Multiple Airlines Logo
5:00 am - 1:00 pm
STL
-
EAS
25h 00m
2 stops
Multiple Airlines Logo
9:20 am - 9:56 pm
EAS
-
STL
19h 36m
2 stops
$959Multiple Airlines
Mon, Oct 5 - Sat, Oct 17
British Airways Logo
10:47 am - 1:00 pm
STL
-
EAS
19h 13m
2 stops
British Airways Logo
9:30 pm - 9:08 pm
EAS
-
STL
30h 38m
2 stops
$1,073British Airways
Mon, Dec 7 - Thu, Dec 10
British Airways Logo
10:47 am - 1:00 pm
STL
-
EAS
19h 13m
2 stops
British Airways Logo
9:30 pm - 10:25 pm
EAS
-
STL
31h 55m
2 stops
$1,078British Airways
Mon, Dec 7 - Thu, Dec 10
Iberia Logo
9:44 am - 1:00 pm
STL
-
EAS
20h 16m
2 stops
Iberia Logo
1:40 pm - 10:44 pm
EAS
-
STL
40h 04m
2 stops
$1,156Iberia
Mon, Jan 11 - Fri, Jan 15

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British Airways flights from St. Louis to San Sebastian

Our best British Airways deals on St. Louis to San Sebastian flight tickets
British Airways
Dec 7
STL10:47 amLambert-St Louis
19h 13m
2 stops
EAS1:00 pmSan Sebastián
Dec 10
EAS9:30 pmSan Sebastián
30h 38m
2 stops
STL9:08 pmLambert-St Louis
$1,073
British Airways
Dec 7
STL10:47 amLambert-St Louis
19h 13m
2 stops
EAS1:00 pmSan Sebastián
Dec 10
EAS9:30 pmSan Sebastián
31h 55m
2 stops
STL10:25 pmLambert-St Louis
$1,078

momondo 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, momondo users made 832,500 searches. Data last updated July 31, 2026.
Use the filters below to find and compare flights from St. Louis to San Sebastian that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Mon 10/5

5:00 am-1:00 pm

2 stops25h 00m

San Sebastián

Sat 10/17

9:20 am-9:56 pm

2 stops19h 36m

$954

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Mon 10/5

5:00 am-1:00 pm

2 stops25h 00m

San Sebastián

Sat 10/17

9:20 am-9:56 pm

2 stops19h 36m

$959

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Mon 12/7

10:47 am-1:00 pm

2 stops19h 13m

San Sebastián

Thu 12/10

9:30 pm-9:08 pm

2 stops30h 38m

$1,073

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Mon 12/7

10:47 am-1:00 pm

2 stops19h 13m

San Sebastián

Thu 12/10

9:30 pm-10:25 pm

2 stops31h 55m

$1,078

St. LouisSan Sebastian

STL - EAS

STLEAS

Lambert-St Louis

Mon 1/11

9:44 am-1:00 pm

2 stops20h 16m

San Sebastián

Fri 1/15

1:40 pm-10:44 pm

2 stops40h 04m

$1,156

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from St. Louis to San Sebastian

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to San Sebastian according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to San Sebastian (STL to EAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Sebastian

Fastest flight time

19h 13m

Direct flights

None
The fastest flight from St. Louis to San Sebastian takes 19h 13m
There are no direct flights from St. Louis to San Sebastian. There are no popular flight routes from St. Louis to San Sebastian.
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Frequently asked questions about flying from St. Louis to San Sebastian

  • How far is Lambert-St Louis to San Sebastián by plane?

    There are 4385.9 mi between Lambert-St Louis and San Sebastián. In terms of flight time, this usually takes a little over 19h 13m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to San Sebastián Airport?

    Prices for flights from Lambert-St Louis Airport to San Sebastián Airport were last updated today.

  • How old do you have to be to fly from Lambert-St Louis Airport to San Sebastián Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to San Sebastián Airport.

  • What documentation or ID do you need to fly to San Sebastián Airport?

    The necessary travel and health documents for your San Sebastián Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Frequently asked questions about flying from St. Louis to San Sebastian

  • How do I get Price Alerts for flights from St. Louis to San Sebastian?

    Price Alerts will notify you by email when the price for flights to San Sebastian from St. Louis decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

  • How can I save money on flights from St. Louis to San Sebastian with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Traveling to a place near San Sebastian?

Book flights to San Sebastian if you plan to visit one of these locations
Irun
Hondarribia

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to San Sebastian?

Finding the right flight to San Sebastian from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to San Sebastian quick and easy, saving you time and money.

Can I find flights from St. Louis to San Sebastian with flexible booking policies on momondo?

Flights from St. Louis to San Sebastian with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to San Sebastian?

momondo provides multiple filters to help you find the best flight to San Sebastian from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from St. Louis to San Sebastian right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to San Sebastian flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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