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$426+ Cheap flights from St. Louis (STL) to Thailand

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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BKK
Feb 11 — Feb 181
Wed 2/11
Wed 2/18
1 adult, Economy
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Cheap flight deals from St. Louis to Thailand

Keep the following information in mind while searching for St. Louis to Thailand flight deals. Data was last updated January 12, 2026.

Round-trip from

$871
(Delta)

One-way from

$426
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$1,059
From Lambert-St Louis to Thailand
Search Deals
One-way flight from Lambert-St Louis to Thailand
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($74 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($56 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from St. Louis to Thailand

Cheapest flights from St. Louis to Thailand
Explore the most affordable flight options available from St. Louis to Thailand. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 12, 2026.

This Delta deal was found by Cheapflights users on 1/11. 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 1/266:00 am
STL
-
BKK
2 stops29h 45m
Delta
Sun 2/82:05 am
BKK
-
STL
2 stops31h 32m
Delta
Deal found 1/11$871
This Delta deal was found by Cheapflights users on 1/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/266:57 pm
STL
-
BKK
2 stops37h 33m
Delta
Tue 2/32:05 am
BKK
-
STL
2 stops31h 32m
Delta
Deal found 1/12$882
This United Airlines deal was found by Cheapflights users on 1/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/2610:07 am
STL
-
BKK
3 stops36h 18m
United Airlines
Mon 2/24:55 pm
BKK
-
STL
3 stops29h 27m
United Airlines
Deal found 1/12$902
This FlightHub deal was found by Cheapflights users on 1/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/261:15 pm
STL
-
BKK
2 stops38h 05m
ANA
Wed 2/410:25 pm
BKK
-
STL
2 stops27h 04m
ANA
Deal found 1/12$903
This FlightHub deal was found by Cheapflights users on 1/10. 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 3/38:00 am
STL
-
BKK
2 stops26h 35m
Japan Airlines
Tue 4/289:45 am
BKK
-
STL
2 stops40h 14m
Japan Airlines
Deal found 1/10$914
This United Airlines deal was found by Cheapflights users on 1/10. 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.
Mon 1/124:15 pm
STL
-
BKK
3 stops54h 10m
United Airlines
Mon 1/264:55 pm
BKK
-
STL
3 stops32h 34m
United Airlines
Deal found 1/10$915
This Delta deal was found by Cheapflights users on 1/10. 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.
Wed 2/256:35 am
STL
-
BKK
2 stops29h 10m
Delta
Sat 3/73:05 am
BKK
-
STL
2 stops32h 53m
Delta
Deal found 1/10$916
This United Airlines deal was found by Cheapflights users on 1/10. 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.
Mon 1/125:00 pm
STL
-
BKK
2 stops53h 25m
United Airlines
Thu 1/224:55 pm
BKK
-
STL
3 stops29h 27m
United Airlines
Deal found 1/10$918
This Delta deal was found by Cheapflights users on 1/11. 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 1/266:10 am
STL
-
BKK
2 stops29h 45m
Delta
Wed 1/282:05 am
BKK
-
STL
2 stops34h 32m
Delta
Deal found 1/11$924
This American Airlines deal was found by Cheapflights users on 1/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/267:04 am
STL
-
BKK
2 stops27h 31m
American Airlines
Mon 2/98:05 am
BKK
-
STL
2 stops23h 09m
American Airlines
Deal found 1/11$925
This Ovago deal was found by Cheapflights users on 1/10. 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.
Wed 2/2511:55 am
STL
-
HKT
2 stops45h 15m
Korean Air
Wed 3/411:40 pm
HKT
-
STL
2 stops34h 01m
Korean Air
Deal found 1/10$992
This Ovago deal was found by Cheapflights users on 1/12. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/26:18 pm
STL
-
HKT
2 stops34h 17m
Cathay Pacific
Mon 3/166:35 pm
HKT
-
STL
2 stops35h 23m
Cathay Pacific
Deal found 1/12$1,006

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Thailand 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 January 12, 2026.
Use the filters below to find and compare flights from St. Louis to Thailand that are best for you.

Fly from

St. Louis

Fly to

Thailand

Route

Depart

Return

Price

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/26

6:57 pm-9:30 pm

2 stops37h 33m

Bangkok Suvarnabhumi

Tue 2/3

2:05 am-8:37 pm

2 stops31h 32m

$882

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 3/2

7:00 am-12:45 am

2 stops28h 45m

Bangkok Suvarnabhumi

Sun 3/8

2:05 am-9:06 pm

2 stops31h 01m

$882

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 1/25

6:57 pm-12:45 am

2 stops40h 48m

Bangkok Suvarnabhumi

Sun 2/15

2:05 am-11:36 pm

2 stops34h 31m

$882

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/25

5:50 pm-12:45 am

2 stops41h 55m

Bangkok Suvarnabhumi

Sat 3/7

3:05 am-10:58 pm

2 stops32h 53m

$921

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/26

6:10 am-12:55 am

2 stops29h 45m

Bangkok Suvarnabhumi

Wed 1/28

2:05 am-11:37 pm

2 stops34h 32m

$924

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 2/10

6:10 am-9:30 pm

2 stops26h 20m

Bangkok Suvarnabhumi

Sat 2/28

2:05 am-11:36 pm

2 stops34h 31m

$938

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 2/1

2:45 pm-11:25 am

3 stops31h 40m

Bangkok Suvarnabhumi

Sun 2/8

4:55 pm-8:58 pm

3 stops41h 03m

$970

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 4/6

4:20 pm-4:20 pm

2 stops36h 00m

Bangkok Suvarnabhumi

Mon 4/20

5:30 pm-11:59 pm

2 stops42h 29m

$971

St. LouisPhuket City

STL - HKT

STLHKT

Lambert-St Louis

Mon 1/19

6:00 am-10:10 pm

2 stops27h 10m

Phuket City

Mon 2/2

11:40 pm-8:53 am

2 stops46h 13m

$972

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/26

5:00 pm-11:25 am

2 stops29h 25m

Bangkok Suvarnabhumi

Mon 2/9

4:55 pm-12:29 pm

3 stops32h 34m

$976

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/10

Showing 1-10 of 37 results
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Best time to book a flight from St. Louis to Thailand

Have a flexible travel schedule? Discover the best time to fly to Thailand 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 Thailand

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to Thailand (average of $926). Flying from St. Louis to Thailand 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 TH?

Find hourly flight availability from St. Louis to Thailand. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 12, 2026.

When flying from St. Louis to Thailand, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 62% versus a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Thailand. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their St. Louis to Thailand flight should consider departing on Monday at noon 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.

Reviews of airlines servicing Thailand

Get insights into the airlines that provide service to Thailand. 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 Thailand. Reviews last updated January 12, 2026.
See what other customers who have flown with Japan Airlines, Delta, and Cathay Pacific from St. Louis to Thailand have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Japan Airlines
8.3
Very good
1,680 reviews

Overall

8.3

Comfort

8.2

Entertainment

7.8

Boarding

8.4

Food

7.7

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Nymo,Nov 2025

NRT - BKK

It’s great experience overall. Stewards are superb. Every crew member is so pleasant. I’ll fly JAL again.
Japan Airlines
8.3
Very good
1,680 reviews
Japan Airlines
8.3
Very good
1,680 reviews

Overall

8.3

Comfort

8.2

Entertainment

7.8

Boarding

8.4

Food

7.7

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Nymo,Nov 2025

NRT - BKK

It’s great experience overall. Stewards are superb. Every crew member is so pleasant. I’ll fly JAL again.
Delta
7.9
Good
8,039 reviews
Japan Airlines
8.3
Very good
1,680 reviews

Overall

8.3

Comfort

8.2

Entertainment

7.8

Boarding

8.4

Food

7.7

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Nymo,Nov 2025

NRT - BKK

It’s great experience overall. Stewards are superb. Every crew member is so pleasant. I’ll fly JAL again.
Cathay Pacific
7.6
Good
1,130 reviews
Japan Airlines
8.3
Very good
1,680 reviews

Overall

8.3

Comfort

8.2

Entertainment

7.8

Boarding

8.4

Food

7.7

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Nymo,Nov 2025

NRT - BKK

It’s great experience overall. Stewards are superb. Every crew member is so pleasant. I’ll fly JAL again.
Qatar Airways
7.4
Good
3,714 reviews
Japan Airlines
8.3
Very good
1,680 reviews

Overall

8.3

Comfort

8.2

Entertainment

7.8

Boarding

8.4

Food

7.7

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Nymo,Nov 2025

NRT - BKK

It’s great experience overall. Stewards are superb. Every crew member is so pleasant. I’ll fly JAL again.
United Airlines
7.4
Good
9,150 reviews
Japan Airlines
8.3
Very good
1,680 reviews

Overall

8.3

Comfort

8.2

Entertainment

7.8

Boarding

8.4

Food

7.7

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Nymo,Nov 2025

NRT - BKK

It’s great experience overall. Stewards are superb. Every crew member is so pleasant. I’ll fly JAL again.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Thailand. 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 Thailand?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Thailand. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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

    For as low as $882, Delta can have you in Thailand from St. Louis in 37h 33m. There are 8737 mi between St. Louis and Thailand. Both multi-stop and nonstop flights can be found to your destination and back.

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

    $494 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Delta and ANA, with prices starting from $531 and $605, respectively.

  • What are the most popular routes from St. Louis to Thailand?

    The most popular flight routes from St. Louis to Thailand are Lambert-St Louis - Bangkok Suvarnabhumi, Lambert-St Louis - Phuket City and Lambert-St Louis - Chiang Mai.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Thailand 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 Thailand?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Thailand (average of $926). Flying from St. Louis to Thailand 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

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Alternative routes for St. Louis to Thailand

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from St. Louis to Thailand

Discover the top 10 airlines that operate flights from St. Louis to Thailand. 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 January 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$793Average$1,339FlexibilityNo cancel feeOn-time81%
Cathay PacificCheapest$927Average$1,272FlexibilityNo cancel feeOn-time72%
Japan AirlinesCheapest$966Average$1,121FlexibilityNo cancel feeOn-time79%
American AirlinesCheapest$979Average$1,279FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$984Average$1,201FlexibilityNo cancel feeOn-time69%
ANACheapest$1,007Average$1,217FlexibilityNo cancel feeOn-time80%
DeltaCheapest$1,040Average$1,539FlexibilityNo cancel feeOn-timeN/A
Qatar AirwaysCheapest$1,094Average$1,372FlexibilityNo cancel feeOn-time68%
Air CanadaCheapest$1,280Average$1,786FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,356Average$1,458FlexibilityNo cancel feeOn-time76%

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