Cheap Flights from St. Louis (STL) to San Salvador (SAL)

Popular airlines from St. Louis Lambert Intl. Airport (STL) to El Salvador Intl. Airport (SAL)

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Flights from St. Louis (STL) to San Salvador (SAL)
Origin airport
Lambert-St. Louis Intl.
Destination airport
El Salvador Intl.
Airlines serving
Air Canada, American Airlines, Copa, Delta, United
Distance
1749 mi

St. Louis to San Salvador Flights

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

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 St. Louis to San Salvador are during the month of . You can find some of the cheapest flights from St. Louis to San Salvador with Expedia's search tool and vast selection of airlines.

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

Sunday is one of the best days to book for cheap flights from St. Louis to San Salvador: 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 St. Louis to San Salvador

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 St. Louis to San Salvador in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 St. Louis to San Salvador 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 St. Louis to San Salvador 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.

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to El Salvador Intl. Airport (SAL) cost?
Discover the latest flight deals from STL to SAL by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from STL to SAL?
The cheapest flights from STL to SAL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from STL to SAL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from STL to SAL. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to El Salvador Intl. Airport (SAL)?
You’ll have to book a flight with a layover if you’re traveling from Lambert-St. Louis Intl. Airport (STL) to El Salvador Intl. Airport (SAL). Direct flights don’t operate daily on this route. However, simply filter your search to include one or more stops to find the best option for your trip.
What day of the week has the most flights from STL to SAL?
Usually you’ll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* But this can change depending on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to El Salvador Intl. Airport (SAL)?
To avoid possible delays on the Lambert-St. Louis Intl. Airport (STL) to El Salvador Intl. Airport (SAL) route, fly before 3 PM. Later flights have a 22% higher chance of cancellation.**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 Lambert-St. Louis Intl. Airport (STL) to El Salvador Intl. Airport (SAL) last-minute?
Last-minute fares from STL to SAL are generally more expensive. For the lowest prices, start looking for flights well in advance. That being said, if your travel plans are flexible, it’s possible to find a cheap fare just before your departure.
Is it cheaper to book a STL to SAL flight and hotel package?
You can save money by securing a STL to SAL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it’s easy to manage it all in one place. After choosing your ideal flights and accommodations, consider adding extras such as tours, activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to El Salvador Intl. Airport (SAL)?
It’s generally possible to reschedule or cancel your STL to SAL flight. However, for bookings made more than 24 hours ago, additional charges may apply. Check your airline’s policies in your itinerary to see what changes are possible and whether any costs are involved. You’ll also find more details on our Customer Service portal.

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*Available to One Key members.