$4,388 Cheap Flights from San Sebastian (EAS) to St. Louis (STL)

View $4,388 flight on Sun, Nov 2, 2025Opens in a new window

Popular airlines from San Sebastian (EAS) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from San Sebastian to St. Louis (EAS-STL)

Prices were available within the past 7 days and start at $4,388 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How much does a flight from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $4,388 or cheap return flight from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from EAS to STL is , when there's less demand. Off-peak months are usually when better flight deals are available between these airports.
What is the cheapest airline that flies from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline flying from EAS to STL, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL)?
There aren't any daily direct flights available from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL). But you can book flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be soaring above the clouds in no time.
What day of the week has the most flights from EAS to STL?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL) route, travel before 3 PM. Departures after this hour have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from EAS to STL right before your trip is usually more expensive. However, if you're flexible with your travel times and dates, you could land a cheap last-minute fare.
Is it cheaper to book an EAS to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking an EAS to STL flight and hotel package with Expedia could lead to significant savings. What's more, having it all in one place takes the hassle out of travel planning. Simply secure your flights and select from our wide range of hotels, then customize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from San Sebastian Airport (EAS) to Lambert-St. Louis Intl. Airport (STL)?
In most instances, you can reschedule or cancel your EAS to STL flight. However, there may be additional charges, especially if you made your booking over 24 hours ago. Check your itinerary for the airline's rules and fees on flight changes, or if you want more details, go to our Customer Service portal.

Travel information

Origin airport
San Sebastian
Destination airport
Lambert-St. Louis Intl.
Distance
4397 mi

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San Sebastian to St. Louis Flights

The cheapest times to fly from San Sebastian to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Sebastian to St. Louis are during the month of . You can find some of the cheapest flights from San Sebastian to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Sebastian to St. Louis

Sunday is one of the best days to book for cheap flights from San Sebastian to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Sebastian to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Sebastian to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $4,388 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Sebastian to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Sebastian to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Sebastian to St. Louis Flights

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