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$399+ 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 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
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Cheap 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 December 23, 2025.

This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/252:45 pmSTL - BKK
3 stops55h 40mUnited Airlines
Sat 2/214:55 pmBKK - STL
3 stops40h 31mUnited Airlines
Deal found 12/20$1,448
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 Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:28 amSTL - BKK
2 stops48h 57mQatar Airways
Sat 2/219:05 amBKK - STL
2 stops51h 23mQatar Airways
Deal found 12/20$1,755
This oojo deal was found by Cheapflights users on 12/19. 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.
Sat 12/277:00 amSTL - BKK
2 stops39h 30mEVA Air
Sat 1/172:40 pmBKK - STL
2 stops36h 14mEVA Air
Deal found 12/19$1,832
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.
Mon 12/227:00 amSTL - HKT
2 stops35h 05mQatar Airways
Sun 12/2812:50 amHKT - STL
2 stops31h 41mQatar Airways
Deal found 12/21$2,492
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/224:05 pmSTL - HKT
2 stops30h 15mMultiple Airlines
Sun 12/2812:05 amHKT - STL
3 stops35h 17mMultiple Airlines
Deal found 12/21$9,181

Find 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 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 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 ($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
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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 December 23, 2025.
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. LouisPhuket City

STL - HKT

STLHKT

Lambert-St Louis

Sun 3/1

6:33 pm-11:20 am

2 stops51h 47m

Phuket City

Tue 3/10

12:20 pm-6:03 pm

2 stops41h 43m

$945

St. LouisPhuket City

STL - HKT

STLHKT

Lambert-St Louis

Tue 2/3

7:04 am-11:20 am

2 stops39h 16m

Phuket City

Tue 2/10

12:20 pm-6:14 pm

2 stops42h 54m

$953

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 2/3

6:00 am-12:20 am

2 stops29h 20m

Bangkok Suvarnabhumi

Tue 2/17

4:55 pm-9:23 am

3 stops29h 28m

$979

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/12

4:35 pm-12:20 am

2 stops42h 45m

Bangkok Suvarnabhumi

Thu 1/29

4:55 pm-5:11 am

2 stops25h 16m

$990

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/25

6:10 am-12:55 am

2 stops29h 45m

Bangkok Suvarnabhumi

Sat 3/7

3:05 am-8:06 pm

2 stops30h 01m

$1,000

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/25

10:10 am-11:25 am

3 stops36h 15m

Bangkok Suvarnabhumi

Sun 3/8

4:55 pm-8:56 pm

3 stops40h 01m

$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

1:05 pm-11:59 pm

2 stops23h 54m

$1,025

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 3/3

8:41 am-11:25 am

3 stops37h 44m

Bangkok Suvarnabhumi

Fri 3/13

4:55 pm-12:27 pm

3 stops31h 32m

$1,032

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 1/7

8:45 am-12:20 am

2 stops26h 35m

Bangkok Suvarnabhumi

Wed 3/4

4:55 pm-8:56 pm

3 stops41h 01m

$1,081

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 1/22

2:45 pm-11:25 am

3 stops31h 40m

Bangkok Suvarnabhumi

Mon 1/26

7:10 am-8:58 pm

2 stops26h 48m

$1,086

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/20

Showing 1-10 of 28 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 $903). 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 December 23, 2025.

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 evening, which can drop the price by up to 26% versus a flight in the morning.

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 December 16, 2024.

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 December 23, 2025.
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
1,660 reviews

Boarding

8.4

Crew

8.7

Comfort

8.2

Food

7.7

Overall

8.3

Entertainment

7.8

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
1,660 reviews
Japan Airlines
8.3
Very good
1,660 reviews

Boarding

8.4

Crew

8.7

Comfort

8.2

Food

7.7

Overall

8.3

Entertainment

7.8

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
8,014 reviews
Japan Airlines
8.3
Very good
1,660 reviews

Boarding

8.4

Crew

8.7

Comfort

8.2

Food

7.7

Overall

8.3

Entertainment

7.8

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
1,103 reviews
Japan Airlines
8.3
Very good
1,660 reviews

Boarding

8.4

Crew

8.7

Comfort

8.2

Food

7.7

Overall

8.3

Entertainment

7.8

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
3,686 reviews
Japan Airlines
8.3
Very good
1,660 reviews

Boarding

8.4

Crew

8.7

Comfort

8.2

Food

7.7

Overall

8.3

Entertainment

7.8

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
9,103 reviews
Japan Airlines
8.3
Very good
1,660 reviews

Boarding

8.4

Crew

8.7

Comfort

8.2

Food

7.7

Overall

8.3

Entertainment

7.8

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 $979, Cathay Pacific can have you in Thailand from St. Louis in 29h 20m. 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?

    $500 is the cheapest one-way deal found within the past few days, from Japan Airlines. You may also be able to find cheap deals on Delta and United Airlines, with prices starting from $540 and $542, 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 $903). 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 9 airlines flying from St. Louis to Thailand

Discover the top 9 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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qatar AirwaysCheapest$897Average$1,385FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$927Average$1,276FlexibilityNo cancel feeOn-time72%
Japan AirlinesCheapest$966Average$1,131FlexibilityNo cancel feeOn-time79%
American AirlinesCheapest$979Average$1,278FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$984Average$1,196FlexibilityNo cancel feeOn-time69%
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%

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