$439 Cheap Flights from St. Louis (STL) to Bangkok (BKK)

View $439 flight on Thu, Feb 19, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Suvarnabhumi Intl. Airport (BKK)

Cheap Flights from St. Louis to Bangkok (STL-BKK)

Prices were available within the past 7 days and start at $439 for one-way flights and $880 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Jan 28 - Wed, Mar 4
STL
St. Louis
BKK
Bangkok
$880 Roundtrip, found 1 day ago
$880
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Jan 28 from St. Louis to Bangkok, returning Wed, Mar 4, priced at $880 found 1 day ago
Delta
Mon, Jan 19 - Thu, Jan 29
STL
St. Louis
BKK
Bangkok
$880 Roundtrip, just found
$880
Roundtrip
just found
Select Delta flight, departing Mon, Jan 19 from St. Louis to Bangkok, returning Thu, Jan 29, priced at $880 just found
United
Wed, Apr 8 - Mon, May 4
STL
St. Louis
BKK
Bangkok
$888 Roundtrip, found 6 hours ago
$888
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Apr 8 from St. Louis to Bangkok, returning Mon, May 4, priced at $888 found 6 hours ago
All Nippon Airways
Tue, Sep 1 - Tue, Sep 29
STL
St. Louis
BKK
Bangkok
$917 Roundtrip, found 18 hours ago
$917
Roundtrip
found 18 hours ago
Select All Nippon Airways flight, departing Tue, Sep 1 from St. Louis to Bangkok, returning Tue, Sep 29, priced at $917 found 18 hours ago
Japan Airlines
Mon, Feb 2 - Tue, Mar 17
STL
St. Louis
BKK
Bangkok
$977 Roundtrip, found 15 hours ago
$977
Roundtrip
found 15 hours ago
Select Japan Airlines flight, departing Mon, Feb 2 from St. Louis to Bangkok, returning Tue, Mar 17, priced at $977 found 15 hours ago
Cathay Pacific
Thu, Feb 19 - Tue, Feb 24
STL
St. Louis
BKK
Bangkok
$1,025 Roundtrip, found 4 hours ago
$1,025
Roundtrip
found 4 hours ago
Select Cathay Pacific flight, departing Thu, Feb 19 from St. Louis to Bangkok, returning Tue, Feb 24, priced at $1,025 found 4 hours ago
Korean Air
Mon, Jan 26 - Mon, Feb 2
STL
St. Louis
BKK
Bangkok
$1,035 Roundtrip, found 10 hours ago
$1,035
Roundtrip
found 10 hours ago
Select Korean Air flight, departing Mon, Jan 26 from St. Louis to Bangkok, returning Mon, Feb 2, priced at $1,035 found 10 hours ago
Qatar Airways
Thu, Feb 19 - Tue, Feb 24
STL
St. Louis
BKK
Bangkok
$1,131 Roundtrip, found 4 hours ago
$1,131
Roundtrip
found 4 hours ago
Select Qatar Airways flight, departing Thu, Feb 19 from St. Louis to Bangkok, returning Tue, Feb 24, priced at $1,131 found 4 hours ago
Turkish Airlines
Mon, Sep 21 - Tue, Sep 29
STL
St. Louis
BKK
Bangkok
$1,251 Roundtrip, found 6 days ago
$1,251
Roundtrip
found 6 days ago
Select Turkish Airlines flight, departing Mon, Sep 21 from St. Louis to Bangkok, returning Tue, Sep 29, priced at $1,251 found 6 days ago
American Airlines
Tue, Jan 20 - Tue, Mar 17
STL
St. Louis
BKK
Bangkok
$1,285 Roundtrip, just found
$1,285
Roundtrip
just found
Select American Airlines flight, departing Tue, Jan 20 from St. Louis to Bangkok, returning Tue, Mar 17, priced at $1,285 just found

Find the cheapest month to fly from St. Louis (STL) to Bangkok (BKK)

September is typically the cheapest month to fly

From $950 - $1,402 per traveler.

Alternative airports near Bangkok

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Suvarnabhumi Intl. BKK. Cheapest option available. Average driving time to city center is 23 minutes. Flights from $1,951
BKK
Suvarnabhumi Intl.
Cheapest
Average driving time to city center23 min
Flights from $1,951
Flights from St. Louis (STL) to Bangkok (BKK)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Suvarnabhumi Intl.
Airlines serving
Air Canada, Air France, All Nippon Airways, American Airlines, Asiana Airlines, Austrian Airlines, British Airways, Cathay Pacific, Delta, Finnair, Japan Airlines, KLM, Korean Air, Lufthansa, Qantas Airways, Qatar Airways, Turkish Airlines, United
Roundtrip price
$879
Distance
8742 mi

St. Louis to Bangkok Flights

The cheapest times to fly from St. Louis to Bangkok

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

 

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

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

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 Bangkok in 2026. You can also book with separate airlines for your outbound and return journeys, from $439 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 Bangkok 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 Bangkok 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 Suvarnabhumi Intl. Airport (BKK) cost?
Snag a cheap one-way flight from $439 or cheap return flight from $880 from Lambert-St. Louis Intl. Airport (STL) to Suvarnabhumi Intl. Airport (BKK) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Suvarnabhumi Intl. Airport (BKK)?
January is the least expensive month to fly from STL to BKK. Timing your trip outside of the busy season is often the key to scoring lower fares.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Suvarnabhumi Intl. Airport (BKK)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest STL to BKK flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Suvarnabhumi Intl. Airport (BKK)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Suvarnabhumi Intl. Airport (BKK) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to BKK?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*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 Suvarnabhumi Intl. Airport (BKK)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to Suvarnabhumi Intl. Airport (BKK) route, travel before 3 PM. Departures after this hour 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 Suvarnabhumi Intl. Airport (BKK) last-minute?
Holding off until just before your departure to book a ticket from STL to BKK often results in higher prices. While you might find some last-minute discounts, they aren't always guaranteed. Keep your travel plans flexible for a better chance of getting a bargain.
Is it cheaper to book a STL to BKK flight and hotel package?
You can save money by booking a STL to BKK flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. After choosing your preferred flights and accommodations, consider other add-ons like car rentals, tours and activities.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Suvarnabhumi Intl. Airport (BKK)?
It's usually possible to reschedule or cancel your STL to BKK 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 allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.