$138 Cheap Flights from St. Thomas (STT) to St. Louis (STL)

View $138 flight on Sat, Oct 18, 2025Opens in a new window

Popular airlines from Cyril E. King Airport (STT) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from St. Thomas to St. Louis (STT-STL)

Prices were available within the past 7 days and start at $138 for one-way flights and $436 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Sat, Nov 1 - Fri, Nov 7
STT
St. Thomas
STL
St. Louis
$436 Roundtrip, found 2 days ago
$436
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Sat, Nov 1 from St. Thomas to St. Louis, returning Fri, Nov 7, priced at $436 found 2 days ago
American Airlines
Tue, Nov 11 - Mon, Nov 17
STT
St. Thomas
STL
St. Louis
$509 Roundtrip, found 1 day ago
$509
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Nov 11 from St. Thomas to St. Louis, returning Mon, Nov 17, priced at $509 found 1 day ago
Delta
Thu, Sep 18 - Sun, Sep 21
STT
St. Thomas
STL
St. Louis
$509 Roundtrip, found 12 hours ago
$509
Roundtrip
found 12 hours ago
Select Delta flight, departing Thu, Sep 18 from St. Thomas to St. Louis, returning Sun, Sep 21, priced at $509 found 12 hours ago
Spirit Airlines
Sat, Nov 1 - Fri, Nov 7
STT
St. Thomas
STL
St. Louis
$531 Roundtrip, found 2 days ago
$531
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Sat, Nov 1 from St. Thomas to St. Louis, returning Fri, Nov 7, priced at $531 found 2 days ago
American Airlines
Sat, Aug 30 - Thu, Sep 4
STT
St. Thomas
STL
St. Louis
$534 Roundtrip, found 4 days ago
$534
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Aug 30 from St. Thomas to St. Louis, returning Thu, Sep 4, priced at $534 found 4 days ago
American Airlines
Fri, Apr 17 - Fri, Apr 24
STT
St. Thomas
STL
St. Louis
$540 Roundtrip, found 7 hours ago
$540
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Fri, Apr 17 from St. Thomas to St. Louis, returning Fri, Apr 24, priced at $540 found 7 hours ago
American Airlines
Fri, Oct 10 - Fri, Oct 17
STT
St. Thomas
STL
St. Louis
$544 Roundtrip, found 3 days ago
$544
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Oct 10 from St. Thomas to St. Louis, returning Fri, Oct 17, priced at $544 found 3 days ago
Delta
Sat, Sep 20 - Sun, Sep 21
STT
St. Thomas
STL
St. Louis
$549 Roundtrip, found 12 hours ago
$549
Roundtrip
found 12 hours ago
Select Delta flight, departing Sat, Sep 20 from St. Thomas to St. Louis, returning Sun, Sep 21, priced at $549 found 12 hours ago
Cape Air
Sat, Nov 1 - Fri, Nov 7
STT
St. Thomas
STL
St. Louis
$624 Roundtrip, found 2 days ago
$624
Roundtrip
found 2 days ago
Select Cape Air flight, departing Sat, Nov 1 from St. Thomas to St. Louis, returning Fri, Nov 7, priced at $624 found 2 days ago
United
Mon, Mar 30 - Mon, Apr 6
STT
St. Thomas
STL
St. Louis
$787 Roundtrip, found 8 hours ago
$787
Roundtrip
found 8 hours ago
Select United flight, departing Mon, Mar 30 from St. Thomas to St. Louis, returning Mon, Apr 6, priced at $787 found 8 hours ago

Find the cheapest month to fly from St. Thomas (STT) to St. Louis (STL)

April is typically the cheapest month to fly

From $220 - $835 per traveler.

Graph displaying average flight prices per month

Flights from St. Thomas (STT) to St. Louis (STL)
Origin airport
Cyril E. King
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$436
Distance
2075 mi

St. Thomas to St. Louis Flights

The cheapest times to fly from St. Thomas 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 St. Thomas to St. Louis are during the month of November. You can find some of the cheapest flights from St. Thomas to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Thomas to St. Louis

Sunday is one of the best days to book for cheap flights from St. Thomas 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 St. Thomas 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 St. Thomas to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $138 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. Thomas 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 St. Thomas 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.

 

Frequently asked questions

How much does a flight from Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL) cost?
Get a cheap one-way flight from $138 or cheap return flight from $436 from Cyril E. King Airport (STT) 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 deals on this route.
What is the cheapest month to fly from Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL)?
November is the cheapest month to fly from STT to STL. Traveling outside of peak seasons is often the key to finding better fares.
What is the cheapest airline that flies from Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest STT to STL flight.
How many flights per day from Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STT to STL?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change depending on a number of factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL) route, aim to fly before 3 PM. Later flights are 22% more likely to be 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 Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your ticket from STT to STL shortly before your journey is generally more expensive. However, if there's some wiggle room with your travel times and dates, you could score a cheap last-minute fare.
Is it cheaper to book a STT to STL flight and hotel package?
Booking a STT to STL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Choose from our wide range of stays and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Cyril E. King Airport (STT) to Lambert-St. Louis Intl. Airport (STL)?
It's generally possible to reschedule or cancel your STT to STL flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.