HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bangkok

$399+ Cheap flights from St. Louis (STL) to Bangkok

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BKK
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Bangkok with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Lambert-St Louis to Bangkok are usually found in September or January, booked 53 days in advance, depart on a Monday or Saturday and return on a Thursday

Cheap flight deals from St. Louis to Bangkok

Cheapest flights from St. Louis to Bangkok
Explore the most affordable flight options available from St. Louis to Bangkok. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 23, 2025.

This United Airlines deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/276:00 amSTL - BKK
3 stops64h 25mUnited Airlines
Sat 1/177:10 amBKK - STL
2 stops27h 50mUnited Airlines
Deal found 12/21$1,548
This United Airlines deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:41 amSTL - BKK
2 stops39h 44mUnited Airlines
Mon 12/299:10 amBKK - STL
2 stops25h 33mUnited Airlines
Deal found 12/22$1,568
This oojo deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:26 pmSTL - BKK
2 stops30h 09mEVA Air
Sat 12/275:15 pmBKK - STL
2 stops43h 44mEVA Air
Deal found 12/21$1,624
This oojo deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/237:00 amSTL - BKK
2 stops40h 00mPhilippine Airlines
Mon 12/296:45 pmBKK - STL
2 stops58h 41mPhilippine Airlines
Deal found 12/22$1,921
This FlightHub deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:08 pmSTL - BKK
2 stops27h 32mQatar Airways
Sat 1/178:15 amBKK - STL
2 stops46h 59mQatar Airways
Deal found 12/22$1,976
This Ovago deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/276:44 pmSTL - BKK
2 stops30h 21mCathay Pacific
Sat 1/173:05 pmBKK - STL
2 stops21h 54mCathay Pacific
Deal found 12/21$1,985
This China Airlines deal was found by Cheapflights users on 12/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure China Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/277:00 amSTL - BKK
2 stops37h 50mMultiple Airlines
Fri 1/162:35 amBKK - STL
2 stops48h 19mMultiple Airlines
Deal found 12/20$2,027
This Expedia deal was found by Cheapflights users on 12/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2211:41 amSTL - BKK
2 stops36h 34mMultiple Airlines
Mon 12/2911:50 pmBKK - STL
2 stops61h 09mMultiple Airlines
Deal found 12/21$2,411

Find flight deals from St. Louis to Bangkok

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Bangkok (TH1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 23, 2025.

Round-trip from

$908
(United Airlines)

One-way from

$399
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$1,906
From Lambert-St Louis to Bangkok
Search Deals
One-way flight from Lambert-St Louis to Bangkok
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($82 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($54 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Bangkok 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, Cheapflights users made 2,558,603 searches. Data last updated December 23, 2025.
Use the filters below to find and compare flights from St. Louis to Bangkok that are best for you.

Fly from

St. Louis

Fly to

Bangkok

Route

Depart

Return

Price

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 1/20

11:22 am-11:25 am

3 stops35h 03m

Bangkok Suvarnabhumi

Tue 1/27

4:55 pm-10:13 am

3 stops30h 18m

$901

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 2/2

6:45 am-12:20 am

2 stops28h 35m

Bangkok Suvarnabhumi

Mon 3/16

4:55 pm-10:25 pm

2 stops41h 30m

$908

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 1/22

8:45 am-11:25 am

3 stops37h 40m

Bangkok Suvarnabhumi

Mon 1/26

4:55 pm-11:02 am

3 stops31h 07m

$944

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 2/1

6:45 am-12:20 am

2 stops28h 35m

Bangkok Suvarnabhumi

Sat 2/7

4:55 pm-5:11 am

2 stops49h 16m

$985

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 4/5

8:30 am-4:35 am

2 stops56h 05m

Bangkok Suvarnabhumi

Sun 4/12

3:40 pm-6:24 pm

2 stops38h 44m

$989

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Fri 2/6

5:00 pm-11:25 am

2 stops53h 25m

Bangkok Suvarnabhumi

Fri 2/13

4:55 pm-4:27 pm

2 stops36h 32m

$990

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/12

4:15 pm-11:25 am

3 stops54h 10m

Bangkok Suvarnabhumi

Thu 1/29

4:55 pm-5:11 am

2 stops25h 16m

$998

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/25

8:41 am-11:25 am

3 stops37h 44m

Bangkok Suvarnabhumi

Sun 3/8

4:55 pm-4:49 pm

3 stops35h 54m

$1,010

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 1/22

11:05 am-12:15 am

2 stops24h 10m

Bangkok Suvarnabhumi

Mon 1/26

7:55 am-11:59 pm

2 stops29h 04m

$1,025

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 3/10

6:51 am-12:20 am

2 stops29h 29m

Bangkok Suvarnabhumi

Tue 3/31

3:40 pm-8:35 am

3 stops28h 55m

$1,030

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/20

Showing 1-10 of 16 results
1
2

Best time to book a flight from St. Louis to Bangkok

Have a flexible travel schedule? Discover the best time to fly to Bangkok from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Bangkok

How far ahead should I book a flight from St. Louis to Bangkok?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Bangkok. Price data was last updated on December 19, 2025.

Booking 53 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Bangkok. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to Bangkok?

Currently, September is the cheapest month in which you can book a flight from St. Louis to Bangkok (average of $941). Flying from St. Louis to Bangkok in June is currently the most expensive (average of $1,273). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to BKK?

Find hourly flight availability from St. Louis to Bangkok. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 23, 2025.

It’s typically best to fly out from St. Louis to Bangkok in the evening. Doing so could potentially save you 22% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from St. Louis to Bangkok?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Bangkok. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Bangkok flight should consider departing on Monday mornings when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Bangkok

Get insights into the airlines that provide service to Bangkok. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Bangkok. Reviews last updated December 23, 2025.
Get a feel of what it's like to fly with ANA, Japan Airlines, and Delta from St. Louis to Bangkok by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very good
1,038 reviews

Entertainment

7.9

Food

7.7

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

HND - LAX

I always take ANA because of the great service and overall experience.
ANA
8.4
Very good
1,038 reviews
ANA
8.4
Very good
1,038 reviews

Entertainment

7.9

Food

7.7

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

HND - LAX

I always take ANA because of the great service and overall experience.
Japan Airlines
8.3
Very good
1,660 reviews
ANA
8.4
Very good
1,038 reviews

Entertainment

7.9

Food

7.7

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

HND - LAX

I always take ANA because of the great service and overall experience.
Delta
7.9
Good
8,014 reviews
ANA
8.4
Very good
1,038 reviews

Entertainment

7.9

Food

7.7

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

HND - LAX

I always take ANA because of the great service and overall experience.
Cathay Pacific
7.6
Good
1,103 reviews
ANA
8.4
Very good
1,038 reviews

Entertainment

7.9

Food

7.7

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

HND - LAX

I always take ANA because of the great service and overall experience.
United Airlines
7.4
Good
9,105 reviews
ANA
8.4
Very good
1,038 reviews

Entertainment

7.9

Food

7.7

Boarding

8.6

Overall

8.4

Comfort

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

HND - LAX

I always take ANA because of the great service and overall experience.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Bangkok. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Bangkok?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to Bangkok. You should not have trouble finding flights to Bangkok from Lambert-St Louis; the airport handles an average of 0 outbound flights to Bangkok per day. You should also have plenty of airline options to choose from since 9 airlines have flights from the St. Louis airport to Bangkok. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

  • How long is the flight from St. Louis to Bangkok?

    A quick flight from St. Louis to Bangkok can take about 35h 03m. United Airlines provides one of the quickest options available for as low as $901. St. Louis and Bangkok are separated by a distance of 8737 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from St. Louis to Bangkok round-trip?

    Cheapflights users have booked flights from St. Louis to Bangkok round-trip from $897. Other airlines that can offer you cheap pricing are Japan Airlines, from $966, and American Airlines, from $979. Qatar Airways is priced at 31% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from St. Louis to Bangkok one-way?

    For one-way options, check prices for Japan Airlines. According to our data, you can fly for as low as $500. Users have also found prices from $540 and $542 on Delta and United Airlines, respectively.

  • Can I find deals for flights from St. Louis to Bangkok that include hotel bookings?

    Yes. In addition to deals on St. Louis to Bangkok flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Bangkok?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Bangkok.

  • Can I find deals for business class flights from St. Louis to Bangkok?

    Yes. Cheapflights offers flight deals from St. Louis to Bangkok by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Bangkok?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Bangkok (average of $941). Flying from St. Louis to Bangkok in June is currently the most expensive (average of $1,273). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 9 airlines flying from St. Louis to Bangkok

Discover the top 9 airlines that operate flights from St. Louis to Bangkok. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qatar AirwaysCheapest$897Average$1,213FlexibilityNo cancel feeOn-time68%
Japan AirlinesCheapest$966Average$1,131FlexibilityNo cancel feeOn-time79%
American AirlinesCheapest$979Average$1,278FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$984Average$1,196FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$984Average$1,381FlexibilityNo cancel feeOn-time72%
ANACheapest$1,007Average$1,217FlexibilityNo cancel feeOn-time80%
DeltaCheapest$1,058Average$1,663FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$1,280Average$1,786FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,356Average$1,458FlexibilityNo cancel feeOn-time76%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.