What is the cheapest airline that flies from Lambert-St Louis to Bangkok?

Japan Airlines is the most popular carrier operating from Lambert-St Louis to Bangkok

What airlines fly to Bangkok?

United Airlines, Cathay Pacific and Delta 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 43% of people opting to fly with this airline when traveling to Bangkok. Keep in mind that there are 10 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 10 as of January 2026.

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 2026

Q: What is the typical price of a round-trip flight between St. Louis and Bangkok?

Prices are currently low for flights on this route. Typical prices usually range from $1,004 to $1,171. The lowest price recently found on this route was $887.

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Find the cheapest flights from St. Louis to Bangkok

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:25 am - 5:10 am

STL

BKK

33h 45m2 stops

9:10 am - 8:23 pm

BKK

STL

48h 13m2 stops

$887United Airlines

Mon, Feb 23 - Sun, Mar 1

12:15 pm - 11:25 am

STL

BKK

34h 10m3 stops

9:10 am - 8:23 pm

BKK

STL

48h 13m2 stops

$891United Airlines

Mon, Feb 23 - Sun, Mar 1

10:20 am - 11:25 am

STL

BKK

36h 05m3 stops

4:55 pm - 9:05 pm

BKK

STL

41h 10m3 stops

$902United Airlines

Wed, Feb 4 - Wed, Feb 11

6:35 am - 12:45 am

STL

BKK

29h 10m2 stops

3:05 am - 8:06 pm

BKK

STL

30h 01m2 stops

$916Delta

Wed, Feb 25 - Sat, Mar 7

6:10 am - 12:55 am

STL

BKK

29h 45m2 stops

2:05 am - 11:36 pm

BKK

STL

34h 31m2 stops

$938Delta

Tue, Feb 24 - Fri, Mar 6

4:35 pm - 11:25 am

STL

BKK

29h 50m3 stops

4:55 pm - 1:16 pm

BKK

STL

33h 21m3 stops

$945United Airlines

Mon, Jan 26 - Thu, Jan 29

6:35 am - 12:55 am

STL

BKK

29h 20m2 stops

3:05 am - 10:58 pm

BKK

STL

32h 53m2 stops

$950Delta

Sun, Mar 1 - Sat, Mar 7

5:00 pm - 11:25 am

STL

BKK

29h 25m2 stops

4:55 pm - 9:22 am

BKK

STL

29h 27m3 stops

$953United Airlines

Mon, Jan 26 - Thu, Jan 29

5:00 pm - 11:25 am

STL

BKK

29h 25m2 stops

4:55 pm - 5:11 am

BKK

STL

25h 16m2 stops

$957United Airlines

Mon, Jan 26 - Thu, Jan 29

6:57 pm - 12:55 am

STL

BKK

40h 58m2 stops

2:05 am - 11:37 pm

BKK

STL

34h 32m2 stops

$959Delta

Sun, Feb 1 - Thu, Feb 5

Cathay Pacific flights from St. Louis to Bangkok

Our best Cathay Pacific deals on St. Louis to Bangkok flight tickets

Cathay Pacific

Apr 1

STL10:33 amLambert-St Louis

36h 32m

2 stops

BKK11:05 amBangkok Suvarnabhumi

Apr 30

BKK11:00 amBangkok Suvarnabhumi

24h 04m

2 stops

STL11:04 pmLambert-St Louis

$1,018

Cathay Pacific

Jan 25

STL6:44 pmLambert-St Louis

52h 21m

2 stops

BKK12:05 pmBangkok Suvarnabhumi

Feb 1

BKK1:05 pmBangkok Suvarnabhumi

44h 08m

2 stops

STL8:13 pmLambert-St Louis

$1,024

Cathay Pacific

Apr 13

STL8:53 amLambert-St Louis

26h 57m

2 stops

BKK11:50 pmBangkok Suvarnabhumi

Apr 20

BKK5:30 pmBangkok Suvarnabhumi

36h 57m

2 stops

STL6:27 pmLambert-St Louis

$1,039

United Airlines flights from St. Louis to Bangkok

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

United Airlines

Feb 23

STL6:25 amLambert-St Louis

33h 45m

2 stops

BKK5:10 amBangkok Suvarnabhumi

Mar 1

BKK9:10 amBangkok Suvarnabhumi

48h 13m

2 stops

STL8:23 pmLambert-St Louis

$887

United Airlines

Feb 23

STL12:15 pmLambert-St Louis

34h 10m

3 stops

BKK11:25 amBangkok Suvarnabhumi

Mar 1

BKK9:10 amBangkok Suvarnabhumi

48h 13m

2 stops

STL8:23 pmLambert-St Louis

$891

United Airlines

Feb 4

STL10:20 amLambert-St Louis

36h 05m

3 stops

BKK11:25 amBangkok Suvarnabhumi

Feb 11

BKK4:55 pmBangkok Suvarnabhumi

41h 10m

3 stops

STL9:05 pmLambert-St Louis

$902

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 2/23

6:25 am-5:10 am

2 stops33h 45m

Bangkok Suvarnabhumi

Sun 3/1

9:10 am-8:23 pm

2 stops48h 13m

$887

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 2/23

12:15 pm-11:25 am

3 stops34h 10m

Bangkok Suvarnabhumi

Sun 3/1

9:10 am-8:23 pm

2 stops48h 13m

$891

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/4

10:20 am-11:25 am

3 stops36h 05m

Bangkok Suvarnabhumi

Wed 2/11

4:55 pm-9:05 pm

3 stops41h 10m

$902

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/25

6:35 am-12:45 am

2 stops29h 10m

Bangkok Suvarnabhumi

Sat 3/7

3:05 am-8:06 pm

2 stops30h 01m

$916

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 2/24

6:10 am-12:55 am

2 stops29h 45m

Bangkok Suvarnabhumi

Fri 3/6

2:05 am-11:36 pm

2 stops34h 31m

$938

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/26

4:35 pm-11:25 am

3 stops29h 50m

Bangkok Suvarnabhumi

Thu 1/29

4:55 pm-1:16 pm

3 stops33h 21m

$945

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 3/1

6:35 am-12:55 am

2 stops29h 20m

Bangkok Suvarnabhumi

Sat 3/7

3:05 am-10:58 pm

2 stops32h 53m

$950

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/26

5:00 pm-11:25 am

2 stops29h 25m

Bangkok Suvarnabhumi

Thu 1/29

4:55 pm-9:22 am

3 stops29h 27m

$953

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/26

5:00 pm-11:25 am

2 stops29h 25m

Bangkok Suvarnabhumi

Thu 1/29

4:55 pm-5:11 am

2 stops25h 16m

$957

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 2/1

6:57 pm-12:55 am

2 stops40h 58m

Bangkok Suvarnabhumi

Thu 2/5

2:05 am-11:37 pm

2 stops34h 32m

$959

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 typical price of a round-trip flight between St. Louis and Bangkok?

What is the cheapest month to fly to Bangkok?

If you aren’t able to travel during the month of January, then book flights to Bangkok from St. Louis during September instead. Flights to Bangkok in September, while not as cheap as those in January, still average around $1,097.

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 $1,300 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	24h 10m
Direct flights	None

The fastest flight from St. Louis to Bangkok takes 24h 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 24h 10m 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 10 as of January 2026.
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
Korean Air	PriceFrom $793	Free Cancellation	Rating 8.4 1,188 reviews	Search Korean Air flights
Japan Airlines	PriceFrom $966	Free Cancellation	Rating 8.3 1,671 reviews	Search Japan Airlines flights
Cathay Pacific	PriceFrom $979	Free Cancellation	Rating 7.6 1,124 reviews	Search Cathay Pacific flights
American Airlines	PriceFrom $979	Free Cancellation	Rating 7.2 11,094 reviews	Search American Airlines flights
United Airlines	PriceFrom $984	Free Cancellation	Rating 7.4 9,139 reviews	Search United Airlines flights
ANA	PriceFrom $1,007	Free Cancellation	Rating 8.4 1,060 reviews	Search ANA flights
Qatar Airways	PriceFrom $1,017	Free Cancellation	Rating 7.4 3,701 reviews	Search Qatar Airways flights
Delta	PriceFrom $1,040	Free Cancellation	Rating 7.9 8,025 reviews	Search Delta flights
Air Canada	PriceFrom $1,280	Free Cancellation	Rating 7.1 10,603 reviews	Search Air Canada flights
Finnair	PriceFrom $1,356	Free Cancellation	Rating 7.6 1,346 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.