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$661+ 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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BKK
Mar 19 — Mar 261
Wed 3/19
Wed 3/26
1 adult, Economy
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The best prices from Lambert-St Louis to Bangkok are usually found in February or January, booked 76 days in advance, depart on a Monday or Saturday and return on a Thursday

Cheap 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 March 14, 2025.

Round-trip from

$1,044
(Booking.com)

One-way from

$661
(United)

Popular in

December

Cheapest in

February

Average price

$1,341
From Lambert-St Louis to Bangkok
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One-way flight from Lambert-St Louis to Bangkok
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Highest demand for flights based on searches. 0% potential increase in price ($9 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($41 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Find 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 March 14, 2025.

This FlightHub deal was found by Cheapflights users on 3/13. 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.
Tue 9/304:40 pmSTL - BKK
2 stops25h 35mQatar Airways
Tue 10/78:00 pmBKK - STL
2 stops39h 25mQatar Airways
Deal found 3/13$1,040
This Gurufare deal was found by Cheapflights users on 3/13. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/288:00 amSTL - BKK
2 stops32h 35mANA
Wed 9/39:35 pmBKK - STL
2 stops31h 00mANA
Deal found 3/13$1,090
This Gurufare deal was found by Cheapflights users on 3/12. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/237:00 amSTL - BKK
2 stops33h 40mJapan Airlines
Thu 10/168:05 amBKK - STL
2 stops23h 56mJapan Airlines
Deal found 3/12$1,100
This Delta deal was found by Cheapflights users on 3/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/293:30 pmSTL - BKK
2 stops42h 15mDelta
Mon 10/69:50 amBKK - STL
2 stops26h 48mDelta
Deal found 3/13$1,104
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Wed 4/238:48 amSTL - BKK
2 stops27h 07mUnited Airlines
Wed 5/149:35 amBKK - STL
2 stops48h 28mUnited Airlines
Deal found 3/13$1,114
This Orbitz deal was found by Cheapflights users on 3/13. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/13:11 pmSTL - BKK
2 stops31h 14mMultiple Airlines
Mon 5/54:45 pmBKK - STL
2 stops33h 23mMultiple Airlines
Deal found 3/13$1,235
This Priceline deal was found by Cheapflights users on 3/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/99:39 amSTL - BKK
2 stops31h 36mAir Canada
Wed 5/147:35 amBKK - STL
2 stops24h 23mAir Canada
Deal found 3/13$1,274
This Korean Air deal was found by Cheapflights users on 3/13. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/278:55 amSTL - BKK
2 stops40h 20mKorean Air
Wed 10/82:35 amBKK - STL
2 stops30h 56mKorean Air
Deal found 3/13$1,300
This Gurufare deal was found by Cheapflights users on 3/13. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/76:15 amSTL - BKK
2 stops29h 35mCathay Pacific
Mon 4/2811:00 amBKK - STL
2 stops23h 28mCathay Pacific
Deal found 3/13$1,357
This Ovago deal was found by Cheapflights users on 3/13. 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.
Mon 6/210:36 amSTL - BKK
2 stops54h 54mFinnair
Wed 7/27:05 amBKK - STL
2 stops28h 47mFinnair
Deal found 3/13$1,557
This Lufthansa deal was found by Cheapflights users on 3/13. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/13:30 pmSTL - BKK
2 stops35h 20mLufthansa
Fri 10/1011:40 pmBKK - STL
2 stops49h 50mLufthansa
Deal found 3/13$1,662
This KLM deal was found by Cheapflights users on 3/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/255:00 pmSTL - BKK
2 stops28h 30mKLM
Sat 5/3112:05 pmBKK - STL
2 stops47h 33mKLM
Deal found 3/12$1,892

Find flights from St. Louis to Bangkok within your budget

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 March 14, 2025.

Fly from

St. Louis

Fly to

Bangkok

Route

Depart

Return

Price

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 9/9

7:00 am-7:20 am

2 stops36h 20m

Bangkok Suvarnabhumi

Tue 9/23

8:00 pm-11:56 pm

2 stops39h 56m

$1,044

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 8/28

8:00 am-4:35 am

2 stops32h 35m

Bangkok Suvarnabhumi

Wed 9/3

9:35 pm-4:35 pm

2 stops31h 00m

$1,090

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 4/23

8:48 am-11:55 pm

2 stops27h 07m

Bangkok Suvarnabhumi

Wed 5/14

9:35 am-10:03 pm

2 stops48h 28m

$1,114

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 4/2

6:15 am-11:00 pm

2 stops28h 45m

Bangkok Suvarnabhumi

Tue 5/27

8:05 am-11:04 pm

2 stops26h 59m

$1,137

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 4/1

3:11 pm-10:25 am

2 stops31h 14m

Bangkok Suvarnabhumi

Mon 5/5

4:45 pm-2:08 pm

2 stops33h 23m

$1,235

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 4/9

9:39 am-5:15 am

2 stops31h 36m

Bangkok Suvarnabhumi

Wed 5/14

7:35 am-7:58 pm

2 stops24h 23m

$1,274

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 4/7

6:15 am-11:50 pm

2 stops29h 35m

Bangkok Suvarnabhumi

Mon 4/28

11:00 am-10:28 pm

2 stops23h 28m

$1,357

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 6/2

10:36 am-5:30 am

2 stops54h 54m

Bangkok Suvarnabhumi

Wed 7/2

7:05 am-11:52 pm

2 stops28h 47m

$1,557

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sat 3/29

6:00 am-11:40 pm

2 stops29h 40m

Bangkok Suvarnabhumi

Sun 4/20

11:30 pm-11:34 pm

2 stops36h 04m

$1,575

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 5/25

5:00 pm-9:30 am

2 stops28h 30m

Bangkok Suvarnabhumi

Sat 5/31

12:05 pm-11:38 pm

2 stops47h 33m

$1,892

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/13

Showing 1-10 of 16 results
1
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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.

Travel insights for flights from St. Louis to Bangkok

Get recent, data-driven insights about flights from St. Louis to Bangkok including ideal travel times, pricing trends, and more.

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 March 7, 2025.

Booking 76 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, February is the cheapest month in which you can book a flight from St. Louis to Bangkok (average of $968). Flying from St. Louis to Bangkok in June is currently the most expensive (average of $1,577). 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 March 14, 2025.

It’s typically best to fly out from St. Louis to Bangkok in the morning. Doing so could potentially save you 24% on the flight price compared to flying at noon, 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 at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Bangkok by month

Plan your trip to Bangkok by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Bangkok ranges from 0.4 - 12.6 inches per month. September is typically the wettest month, when rainfall can reach 12.6 in. January is typically the driest time to visit Bangkok when rainfall is around 0.4 in.

Temperature in Bangkok by month

Plan your trip to Bangkok by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Bangkok, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 86.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 78.8 F).

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 March 14, 2025.
Korean Air
8.4
Very good
1,047 reviews

Entertainment

8.2

Food

8.1

Crew

8.7

Boarding

8.5

Comfort

8.3

Overall

8.4

Reviews

1 / 20

10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Korean Air
8.4
Very good
1,047 reviews
Korean Air
8.4
Very good
1,047 reviews

Entertainment

8.2

Food

8.1

Crew

8.7

Boarding

8.5

Comfort

8.3

Overall

8.4

Reviews

1 / 20

10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

ANA
8.4
Very good
829 reviews
Korean Air
8.4
Very good
1,047 reviews

Entertainment

8.2

Food

8.1

Crew

8.7

Boarding

8.5

Comfort

8.3

Overall

8.4

Reviews

1 / 20

10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Japan Airlines
8.3
Very good
1,438 reviews
Korean Air
8.4
Very good
1,047 reviews

Entertainment

8.2

Food

8.1

Crew

8.7

Boarding

8.5

Comfort

8.3

Overall

8.4

Reviews

1 / 20

10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Alaska Airlines
8.0
Very good
9,735 reviews
Korean Air
8.4
Very good
1,047 reviews

Entertainment

8.2

Food

8.1

Crew

8.7

Boarding

8.5

Comfort

8.3

Overall

8.4

Reviews

1 / 20

10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

KLM
7.8
Good
1,320 reviews
Korean Air
8.4
Very good
1,047 reviews

Entertainment

8.2

Food

8.1

Crew

8.7

Boarding

8.5

Comfort

8.3

Overall

8.4

Reviews

1 / 20

10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

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 10 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.

  • 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 $1,044. Other airlines that can offer you cheap pricing are ANA, from $1,090, and United Airlines, from $1,114. Qatar Airways is priced at 27% 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 United Airlines. According to our data, you can fly for as low as $661. Users have also found prices from $724 and $1,584 on Korean Air and Alaska 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, February is the cheapest month in which you can book a flight from St. Louis to Bangkok (average of $968). Flying from St. Louis to Bangkok in June is currently the most expensive (average of $1,577). 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

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Top 10 airlines flying from St. Louis to Bangkok

Discover the top 10 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 March 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Japan AirlinesCheapest$1,080Average$1,183FlexibilityNo cancel feeOn-time79%
DeltaCheapest$1,104Average$1,333FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$1,113Average$1,158FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,114Average$1,197FlexibilityNo cancel feeOn-time71%
Turkish AirlinesCheapest$1,116Average$1,320FlexibilityNo cancel feeOn-time77%
ANACheapest$1,125Average$1,254FlexibilityNo cancel feeOn-time80%
Air CanadaCheapest$1,176Average$1,747FlexibilityNo cancel feeOn-time67%
Cathay PacificCheapest$1,265Average$1,479FlexibilityNo cancel feeOn-time72%
Qatar AirwaysCheapest$1,272Average$1,380FlexibilityNo cancel feeOn-time68%
FinnairCheapest$1,289Average$1,542FlexibilityNo cancel feeOn-time76%
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