HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Thailand

$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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BKK
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Thailand 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.

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 November 26, 2025.

This Flysmarter deal was found by Cheapflights users on 11/25. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/27:00 amSTL - BKK
2 stops33h 00mJapan Airlines
Tue 12/98:05 amBKK - STL
2 stops21h 45mJapan Airlines
Deal found 11/25$948
This United Airlines deal was found by Cheapflights users on 11/25. 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 11/2611:37 amSTL - BKK
3 stops34h 48mUnited Airlines
Tue 12/24:55 pmBKK - STL
2 stops36h 32mUnited Airlines
Deal found 11/25$1,007
This FlightHub deal was found by Cheapflights users on 11/26. 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 11/298:00 amSTL - BKK
2 stops33h 30mANA
Mon 12/1510:25 pmBKK - STL
2 stops30h 39mANA
Deal found 11/26$1,021
This Ovago deal was found by Cheapflights users on 11/26. 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 11/298:39 amSTL - BKK
2 stops26h 36mCathay Pacific
Mon 12/157:15 pmBKK - STL
2 stops41h 42mCathay Pacific
Deal found 11/26$1,038
This United Airlines deal was found by Cheapflights users on 11/24. 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 11/299:00 amSTL - BKK
3 stops37h 25mUnited Airlines
Mon 12/154:55 pmBKK - STL
3 stops34h 30mUnited Airlines
Deal found 11/24$1,102
This Ovago deal was found by Cheapflights users on 11/25. 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 11/298:39 amSTL - BKK
2 stops44h 46mQatar Airways
Sun 12/143:00 amBKK - STL
2 stops33h 38mQatar Airways
Deal found 11/25$1,385
This EVA Air deal was found by Cheapflights users on 11/24. 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 EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/295:00 pmSTL - BKK
2 stops29h 10mMultiple Airlines
Sun 12/142:15 amBKK - STL
2 stops27h 20mMultiple Airlines
Deal found 11/24$1,428
This Ovago deal was found by Cheapflights users on 11/25. 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.
Fri 12/56:55 amSTL - HKT
2 stops39h 25mCathay Pacific
Mon 1/126:35 pmHKT - STL
2 stops42h 24mCathay Pacific
Deal found 11/25$1,594
This FlightHub deal was found by Cheapflights users on 11/24. 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.
Fri 12/57:00 amSTL - HKT
2 stops34h 40mQatar Airways
Mon 1/128:20 amHKT - STL
2 stops52h 39mQatar Airways
Deal found 11/24$1,683
This EVA Air deal was found by Cheapflights users on 11/24. 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 EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/212:40 pmSTL - CNX
2 stops30h 55mMultiple Airlines
Sat 1/311:50 amCNX - STL
2 stops36h 00mMultiple Airlines
Deal found 11/24$3,428
This Delta deal was found by Cheapflights users on 11/24. 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.
Sun 12/217:02 pmSTL - CNX
2 stops38h 53mDelta
Sun 1/412:15 amCNX - STL
2 stops45h 38mDelta
Deal found 11/24$4,244
This Delta deal was found by Cheapflights users on 11/24. 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 12/226:29 amSTL - CNX
2 stops27h 26mDelta
Sat 1/312:15 amCNX - STL
2 stops33h 32mDelta
Deal found 11/24$4,298

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 November 26, 2025.

Round-trip from

$901
(United Airlines)

One-way from

$399
(Kiwi.com)

Popular in

July

Cheapest in

September

Average price

$1,194
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. 10% potential increase in price ($142 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 26, 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. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 2/24

11:25 am-5:10 am

2 stops28h 45m

Bangkok Suvarnabhumi

Wed 3/4

4:55 pm-2:42 pm

3 stops34h 47m

$901

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Fri 1/30

6:45 am-11:25 am

2 stops39h 40m

Bangkok Suvarnabhumi

Thu 2/19

4:55 pm-8:26 pm

3 stops40h 31m

$943

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/19

7:04 am-12:15 am

2 stops28h 11m

Bangkok Suvarnabhumi

Tue 2/3

7:55 am-11:59 pm

2 stops29h 04m

$984

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 3/9

2:47 pm-1:05 pm

2 stops34h 18m

Bangkok Suvarnabhumi

Fri 3/27

10:55 am-12:50 am

2 stops25h 55m

$989

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sat 1/10

5:00 pm-11:25 am

2 stops53h 25m

Bangkok Suvarnabhumi

Sat 1/17

4:55 pm-5:11 am

2 stops49h 16m

$998

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/19

9:57 am-11:25 am

3 stops36h 28m

Bangkok Suvarnabhumi

Mon 1/26

4:55 pm-10:41 am

3 stops30h 46m

$998

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 4/12

3:35 pm-9:45 am

2 stops30h 10m

Bangkok Suvarnabhumi

Sat 4/18

2:40 am-1:15 am

2 stops34h 35m

$1,002

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Fri 5/8

6:00 pm-9:45 am

2 stops27h 45m

Bangkok Suvarnabhumi

Sat 5/23

2:40 am-10:50 pm

2 stops32h 10m

$1,002

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 4/1

6:38 am-10:00 am

2 stops39h 22m

Bangkok Suvarnabhumi

Thu 4/30

11:00 am-10:29 pm

2 stops23h 29m

$1,005

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 4/1

8:30 am-9:45 am

2 stops37h 15m

Bangkok Suvarnabhumi

Thu 4/30

3:40 pm-2:18 pm

3 stops34h 38m

$1,006

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/25

Showing 1-10 of 28 results
1
2
3

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, August is the cheapest month in which you can book a flight from St. Louis to Thailand (average of $963). Flying from St. Louis to Thailand in June is currently the most expensive (average of $1,263). 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 November 26, 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 November 26, 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
1,630 reviews

Crew

8.7

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

NRT - YVR

I had difficulties to get my mileage number registered on my flights. I wasn’t able to put it in at JAL check-in counter or online checking-in. I had to call the customer service in Japan by wasting much time.
Japan Airlines
8.3
Very good
1,630 reviews
Japan Airlines
8.3
Very good
1,630 reviews

Crew

8.7

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

NRT - YVR

I had difficulties to get my mileage number registered on my flights. I wasn’t able to put it in at JAL check-in counter or online checking-in. I had to call the customer service in Japan by wasting much time.
Delta
7.9
Good
7,998 reviews
Japan Airlines
8.3
Very good
1,630 reviews

Crew

8.7

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

NRT - YVR

I had difficulties to get my mileage number registered on my flights. I wasn’t able to put it in at JAL check-in counter or online checking-in. I had to call the customer service in Japan by wasting much time.
Cathay Pacific
7.6
Good
1,068 reviews
Japan Airlines
8.3
Very good
1,630 reviews

Crew

8.7

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

NRT - YVR

I had difficulties to get my mileage number registered on my flights. I wasn’t able to put it in at JAL check-in counter or online checking-in. I had to call the customer service in Japan by wasting much time.
Qatar Airways
7.4
Good
3,675 reviews
Japan Airlines
8.3
Very good
1,630 reviews

Crew

8.7

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

NRT - YVR

I had difficulties to get my mileage number registered on my flights. I wasn’t able to put it in at JAL check-in counter or online checking-in. I had to call the customer service in Japan by wasting much time.
United Airlines
7.4
Good
9,046 reviews
Japan Airlines
8.3
Very good
1,630 reviews

Crew

8.7

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

NRT - YVR

I had difficulties to get my mileage number registered on my flights. I wasn’t able to put it in at JAL check-in counter or online checking-in. I had to call the customer service in Japan by wasting much time.

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 $901, United Airlines can have you in Thailand from St. Louis in 28h 45m. There are 8737 mi between St. Louis and Thailand.

  • 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, August is the cheapest month in which you can book a flight from St. Louis to Thailand (average of $963). Flying from St. Louis to Thailand in June is currently the most expensive (average of $1,263). 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.

Alternative routes for St. Louis to Thailand

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Narita flights
St. Louis to Haneda flights
Kansas City to Suvarnabhumi flights
Kansas City to Narita flights
Kansas City to Haneda flights
St. Louis to Suvarnabhumi flights
Kansas City to Ho Chi Minh City flights
St. Louis to Hyderabad flights
Kansas City to Kuala Lumpur Intl flights
St. Louis to New Delhi flights
St. Louis to Ho Chi Minh City flights
Kansas City to Manila flights
Springfield to Suvarnabhumi flights
St. Louis to Manila flights
Kansas City to New Delhi flights
Kansas City to Hyderabad flights
Kansas City to Incheon Intl flights
St. Louis to Hong Kong flights
St. Louis to Denpasar flights
St. Louis to Mumbai flights
Kansas City to Mumbai flights
St. Louis to Cebu City flights
St. Louis to Incheon Intl flights
St. Louis to Kansai Intl flights
Kansas City to Kathmandu flights
Kansas City to Hongqiao Intl flights
St. Louis to Bangalore flights
St. Louis to Hongqiao Intl flights
Springfield to Narita flights
St. Louis to Pu Dong flights
Kansas City to Pu Dong flights
Springfield to Haneda flights
St. Louis to Chennai flights
St. Louis to Colombo flights
Columbia to Hong Kong flights
Kansas City to Hong Kong flights
St. Louis to Kathmandu flights
Kansas City to Kansai Intl flights
St. Louis to Kuala Lumpur Intl flights
Kansas City to Osaka Itami flights
Springfield to Manila flights
Kansas City to Phuket City flights
Kansas City to Malé flights
Kansas City to Taiwan Taoyuan Intl flights
St. Louis to Gimpo Intl flights
Kansas City to Denpasar flights
Kansas City to Lahore flights
St. Louis to Okinawa flights

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 November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qatar AirwaysCheapest$897Average$1,385FlexibilityNo cancel feeOn-time68%
Cathay PacificCheapest$927Average$1,266FlexibilityNo cancel feeOn-time72%
Japan AirlinesCheapest$976Average$1,133FlexibilityNo cancel feeOn-time79%
American AirlinesCheapest$979Average$1,278FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$984Average$1,161FlexibilityNo cancel feeOn-time69%
ANACheapest$1,007Average$1,217FlexibilityNo cancel feeOn-time80%
DeltaCheapest$1,058Average$1,618FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$1,176Average$1,747FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,289Average$1,456FlexibilityNo 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.