What airlines fly to Bangkok?

United Airlines, Cathay Pacific and Japan Airlines are the top three most popular airlines that fly to Bangkok from St. Louis according to our data. United Airlines is the first choice among our users, with 48% of people opting to fly with this airline when traveling to Bangkok. Keep in mind that there are 9 different airlines that fly to Bangkok on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Lambert-St Louis Airport to Bangkok?

Prices for flights from Lambert-St Louis Airport to Bangkok are updated daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Bangkok?

The number of operators available for flights from Lambert-St Louis Airport to Bangkok is 9 as of November 2025.

How old do you have to be to fly from Lambert-St Louis Airport to Bangkok?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Bangkok.

What documentation or ID do you need to fly to Bangkok?

The travel and health documents you'll need for your trip to Bangkok may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Bangkok. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$399 Cheap Flights from St. Louis to Bangkok in 2025/26

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Cheap round-trip flights

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11:25 am - 5:10 amSTL-BKK

28h 45m2 stops

4:55 pm - 2:42 pmBKK-STL

34h 47m3 stops

$901United Airlines

Find Deal

Tue, Feb 24 - Wed, Mar 4

6:00 am - 4:25 pmSTL-BKK

45h 25m2 stops

1:10 am - 11:59 pmBKK-STL

35h 49m2 stops

$925Japan Airlines

Find Deal

Wed, Jan 7 - Wed, Jan 14

7:04 am - 5:00 amSTL-BKK

32h 56m2 stops

10:05 pm - 1:03 pmBKK-STL

27h 58m2 stops

$940Japan Airlines

Find Deal

Wed, Jan 14 - Wed, Jan 21

6:45 am - 11:25 amSTL-BKK

39h 40m2 stops

4:55 pm - 8:26 pmBKK-STL

40h 31m3 stops

$943United Airlines

Find Deal

Fri, Jan 30 - Thu, Feb 19

7:04 am - 11:35 pmSTL-BKK

27h 31m2 stops

8:05 am - 2:50 pmBKK-STL

43h 45m2 stops

$965Japan Airlines

Find Deal

Mon, Jan 19 - Mon, Jan 26

7:41 am - 5:10 amSTL-BKK

32h 29m2 stops

7:10 am - 4:58 pmBKK-STL

22h 48m2 stops

$968United Airlines

Find Deal

Tue, Feb 24 - Wed, Mar 4

6:00 am - 4:25 pmSTL-BKK

45h 25m2 stops

1:10 am - 11:59 pmBKK-STL

35h 49m2 stops

$984Japan Airlines

Find Deal

Wed, Jan 7 - Wed, Jan 14

2:47 pm - 1:05 pmSTL-BKK

34h 18m2 stops

2:35 am - 12:50 amBKK-STL

34h 15m2 stops

$989Multiple Airlines

Find Deal

Mon, Mar 9 - Thu, Mar 26

6:45 am - 11:25 amSTL-BKK

39h 40m2 stops

4:55 pm - 2:30 pmBKK-STL

34h 35m3 stops

$993United Airlines

Find Deal

Mon, Jan 19 - Tue, Feb 3

5:00 pm - 11:25 amSTL-BKK

53h 25m2 stops

4:55 pm - 5:11 amBKK-STL

49h 16m2 stops

$998United Airlines

Find Deal

Sat, Jan 10 - Sat, Jan 17

Japan Airlines flights from St. Louis to Bangkok

Our best Japan Airlines deals on St. Louis to Bangkok flight tickets

Japan Airlines

Jan 7

STL6:00 amLambert-St Louis

45h 25m

2 stops

BKK4:25 pmBangkok Suvarnabhumi

Jan 14

BKK1:10 amBangkok Suvarnabhumi

35h 49m

2 stops

STL11:59 pmLambert-St Louis

$925

Find similar

Japan Airlines

Jan 14

STL7:04 amLambert-St Louis

32h 56m

2 stops

BKK5:00 amBangkok Suvarnabhumi

Jan 21

BKK10:05 pmBangkok Suvarnabhumi

27h 58m

2 stops

STL1:03 pmLambert-St Louis

$940

Find similar

Japan Airlines

Dec 2

STL7:00 amLambert-St Louis

33h 00m

2 stops

BKK5:00 amBangkok Suvarnabhumi

Dec 9

BKK8:05 amBangkok Suvarnabhumi

21h 45m

2 stops

STL4:50 pmLambert-St Louis

$948

Find similar

United Airlines flights from St. Louis to Bangkok

Our best United Airlines deals on St. Louis to Bangkok flight tickets

United Airlines

Feb 24

STL11:25 amLambert-St Louis

28h 45m

2 stops

BKK5:10 amBangkok Suvarnabhumi

Mar 4

BKK4:55 pmBangkok Suvarnabhumi

34h 47m

3 stops

STL2:42 pmLambert-St Louis

$901

Find similar

United Airlines

Jan 30

STL6:45 amLambert-St Louis

39h 40m

2 stops

BKK11:25 amBangkok Suvarnabhumi

Feb 19

BKK4:55 pmBangkok Suvarnabhumi

40h 31m

3 stops

STL8:26 pmLambert-St Louis

$943

Find similar

United Airlines

Feb 24

STL7:41 amLambert-St Louis

32h 29m

2 stops

BKK5:10 amBangkok Suvarnabhumi

Mar 4

BKK7:10 amBangkok Suvarnabhumi

22h 48m

2 stops

STL4:58 pmLambert-St Louis

$968

Find similar

Fly from

Fly to

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

Wed 1/7

6:00 am-4:25 pm

2 stops45h 25m

Bangkok Suvarnabhumi

Wed 1/14

1:10 am-11:59 pm

2 stops35h 49m

$925

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 1/14

7:04 am-5:00 am

2 stops32h 56m

Bangkok Suvarnabhumi

Wed 1/21

10:05 pm-1:03 pm

2 stops27h 58m

$940

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-11:35 pm

2 stops27h 31m

Bangkok Suvarnabhumi

Mon 1/26

8:05 am-2:50 pm

2 stops43h 45m

$965

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 2/24

7:41 am-5:10 am

2 stops32h 29m

Bangkok Suvarnabhumi

Wed 3/4

7:10 am-4:58 pm

2 stops22h 48m

$968

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 1/7

6:00 am-4:25 pm

2 stops45h 25m

Bangkok Suvarnabhumi

Wed 1/14

1:10 am-11:59 pm

2 stops35h 49m

$984

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 3/9

2:47 pm-1:05 pm

2 stops34h 18m

Bangkok Suvarnabhumi

Thu 3/26

2:35 am-12:50 am

2 stops34h 15m

$989

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/19

6:45 am-11:25 am

2 stops39h 40m

Bangkok Suvarnabhumi

Tue 2/3

4:55 pm-2:30 pm

3 stops34h 35m

$993

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

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Bangkok

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Bangkok?

If you aren’t able to travel during the month of September, then book flights to Bangkok from St. Louis during January instead. Flights to Bangkok in January, while not as cheap as those in September, still average around $1,114.

What is the cheapest day to depart on your flight to Bangkok?

On average, the least expensive day to fly to Bangkok from St. Louis is on a Monday. momondo users have found tickets for Monday departures for as low as $1,334. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from St. Louis to Bangkok on a Thursday will generally be more expensive and average around $1,546. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Bangkok?

According to our data, the cheapest time of day to fly to Bangkok is in the morning. momondo users have found flights departing from St. Louis to Bangkok in the morning for as low as $1,339. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Try not to purchase tickets at noon because they tend to be around $1,754. Of course, these prices can vary depending on the time of year and what airport you fly to.

How far in advance should I book a flight to Bangkok?

You are more likely to see cheaper flights to Bangkok from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Bangkok for around $1,272 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Bangkok from St. Louis for as low as $991 on momondo.

Cheap St. Louis to Bangkok flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Bangkok

Fastest flight time	26h 10m
Direct flights	None

The fastest flight from St. Louis to Bangkok takes 26h 10m

There are no direct flights from St. Louis to Bangkok. There are no popular flight routes from St. Louis to Bangkok.

Search flight deals

How far is Lambert-St Louis to Bangkok by plane?
A flight from Lambert-St Louis to Bangkok will travel around 8745.3 mi. Typically, this will take 27h 31m by plane in normal conditions.
When did momondo last update prices for flights from Lambert-St Louis Airport to Bangkok?
Prices for flights from Lambert-St Louis Airport to Bangkok are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Bangkok?
The number of operators available for flights from Lambert-St Louis Airport to Bangkok is 9 as of November 2025.
How old do you have to be to fly from Lambert-St Louis Airport to Bangkok?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Bangkok.
What documentation or ID do you need to fly to Bangkok?
The travel and health documents you'll need for your trip to Bangkok may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Bangkok. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to Bangkok

Compare and see reviews for airlines that fly from St. Louis to Bangkok with momondo

Airline	Rating	Free Cancellation	Price
Qatar Airways	PriceFrom $897	Free Cancellation	Rating 7.4 3,677 reviews	Search Qatar Airways flights
Japan Airlines	PriceFrom $976	Free Cancellation	Rating 8.3 1,630 reviews	Search Japan Airlines flights
American Airlines	PriceFrom $979	Free Cancellation	Rating 7.2 11,037 reviews	Search American Airlines flights
United Airlines	PriceFrom $984	Free Cancellation	Rating 7.4 9,050 reviews	Search United Airlines flights
Cathay Pacific	PriceFrom $993	Free Cancellation	Rating 7.6 1,072 reviews	Search Cathay Pacific flights
ANA	PriceFrom $1,007	Free Cancellation	Rating 8.4 1,011 reviews	Search ANA flights
Delta	PriceFrom $1,058	Free Cancellation	Rating 7.9 8,004 reviews	Search Delta flights
Air Canada	PriceFrom $1,176	Free Cancellation	Rating 7.1 10,481 reviews	Search Air Canada flights
Finnair	PriceFrom $1,289	Free Cancellation	Rating 7.6 1,334 reviews	Search Finnair flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Bangkok?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Bangkok from St. Louis.

Can I find flights from St. Louis to Bangkok with flexible booking policies on momondo?

Flights from St. Louis to Bangkok with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Bangkok?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Bangkok from St. Louis.

I’m not ready to book a flight from St. Louis to Bangkok right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to Bangkok flights. All you need is a valid email address and we will do the rest; it is that quick and easy.