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 45% 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.

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

Delta, ANA, and United Airlines are the most popular carriers operating from Lambert-St Louis to Bangkok

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 December 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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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.

6:45 am - 12:20 am

STL

BKK

28h 35m2 stops

4:55 pm - 10:25 pm

BKK

STL

41h 30m2 stops

$908United Airlines

Mon, Feb 2 - Mon, Mar 16

8:30 am - 9:45 am

STL

BKK

37h 15m2 stops

9:35 am - 4:08 pm

BKK

STL

42h 33m2 stops

$936United Airlines

Thu, Apr 16 - Tue, Apr 21

8:45 am - 11:25 am

STL

BKK

37h 40m3 stops

4:55 pm - 9:22 am

BKK

STL

29h 27m3 stops

$944United Airlines

Thu, Jan 22 - Mon, Jan 26

8:30 am - 9:45 am

STL

BKK

37h 15m2 stops

3:40 pm - 9:25 am

BKK

STL

29h 45m3 stops

$952United Airlines

Thu, Apr 16 - Tue, Apr 21

7:04 am - 12:15 am

STL

BKK

28h 11m2 stops

11:40 am - 11:59 pm

BKK

STL

25h 19m2 stops

$953Cathay Pacific

Wed, Feb 4 - Wed, Feb 11

6:46 pm - 12:15 am

STL

BKK

40h 29m2 stops

4:55 pm - 6:11 pm

BKK

STL

38h 16m2 stops

$959Cathay Pacific

Tue, Feb 3 - Tue, Feb 17

10:07 am - 11:50 pm

STL

BKK

25h 43m2 stops

11:00 am - 8:55 am

BKK

STL

33h 55m2 stops

$960Cathay Pacific

Wed, Apr 1 - Thu, Apr 30

5:00 pm - 11:25 am

STL

BKK

53h 25m2 stops

4:55 pm - 8:26 pm

BKK

STL

40h 31m3 stops

$961United Airlines

Wed, Feb 4 - Wed, Feb 11

2:45 pm - 11:25 am

STL

BKK

31h 40m3 stops

4:55 pm - 1:14 pm

BKK

STL

33h 19m3 stops

$976United Airlines

Wed, Feb 4 - Wed, Feb 11

6:45 am - 12:20 am

STL

BKK

28h 35m2 stops

4:55 pm - 4:58 pm

BKK

STL

37h 03m3 stops

$979United Airlines

Mon, Feb 2 - Tue, Feb 24

United Airlines flights from St. Louis to Bangkok

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

United Airlines

Feb 2

STL6:45 amLambert-St Louis

28h 35m

2 stops

BKK12:20 amBangkok Suvarnabhumi

Mar 16

BKK4:55 pmBangkok Suvarnabhumi

41h 30m

2 stops

STL10:25 pmLambert-St Louis

$908

Find similar

United Airlines

Apr 16

STL8:30 amLambert-St Louis

37h 15m

2 stops

BKK9:45 amBangkok Suvarnabhumi

Apr 21

BKK9:35 amBangkok Suvarnabhumi

42h 33m

2 stops

STL4:08 pmLambert-St Louis

$936

Find similar

United Airlines

Jan 22

STL8:45 amLambert-St Louis

37h 40m

3 stops

BKK11:25 amBangkok Suvarnabhumi

Jan 26

BKK4:55 pmBangkok Suvarnabhumi

29h 27m

3 stops

STL9:22 amLambert-St Louis

$944

Find similar

Cathay Pacific flights from St. Louis to Bangkok

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

Cathay Pacific

Feb 4

STL7:04 amLambert-St Louis

28h 11m

2 stops

BKK12:15 amBangkok Suvarnabhumi

Feb 11

BKK11:40 amBangkok Suvarnabhumi

25h 19m

2 stops

STL11:59 pmLambert-St Louis

$953

Find similar

Cathay Pacific

Feb 3

STL6:46 pmLambert-St Louis

40h 29m

2 stops

BKK12:15 amBangkok Suvarnabhumi

Feb 17

BKK4:55 pmBangkok Suvarnabhumi

38h 16m

2 stops

STL6:11 pmLambert-St Louis

$959

Find similar

Cathay Pacific

Apr 1

STL10:07 amLambert-St Louis

25h 43m

2 stops

BKK11:50 pmBangkok Suvarnabhumi

Apr 30

BKK11:00 amBangkok Suvarnabhumi

33h 55m

2 stops

STL8:55 amLambert-St Louis

$960

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 2/2

6:45 am-12:20 am

2 stops28h 35m

Bangkok Suvarnabhumi

Mon 3/16

4:55 pm-10:25 pm

2 stops41h 30m

$908

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 4/16

8:30 am-9:45 am

2 stops37h 15m

Bangkok Suvarnabhumi

Tue 4/21

9:35 am-4:08 pm

2 stops42h 33m

$936

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 1/22

8:45 am-11:25 am

3 stops37h 40m

Bangkok Suvarnabhumi

Mon 1/26

4:55 pm-9:22 am

3 stops29h 27m

$944

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 4/16

8:30 am-9:45 am

2 stops37h 15m

Bangkok Suvarnabhumi

Tue 4/21

3:40 pm-9:25 am

3 stops29h 45m

$952

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/4

7:04 am-12:15 am

2 stops28h 11m

Bangkok Suvarnabhumi

Wed 2/11

11:40 am-11:59 pm

2 stops25h 19m

$953

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 2/3

6:46 pm-12:15 am

2 stops40h 29m

Bangkok Suvarnabhumi

Tue 2/17

4:55 pm-6:11 pm

2 stops38h 16m

$959

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 4/1

10:07 am-11:50 pm

2 stops25h 43m

Bangkok Suvarnabhumi

Thu 4/30

11:00 am-8:55 am

2 stops33h 55m

$960

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/4

5:00 pm-11:25 am

2 stops53h 25m

Bangkok Suvarnabhumi

Wed 2/11

4:55 pm-8:26 pm

3 stops40h 31m

$961

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 2/4

2:45 pm-11:25 am

3 stops31h 40m

Bangkok Suvarnabhumi

Wed 2/11

4:55 pm-1:14 pm

3 stops33h 19m

$976

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 2/2

6:45 am-12:20 am

2 stops28h 35m

Bangkok Suvarnabhumi

Tue 2/24

4:55 pm-4:58 pm

3 stops37h 03m

$979

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 $1,311 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	28h 11m
Direct flights	None

The fastest flight from St. Louis to Bangkok takes 28h 11m

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 28h 11m 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 December 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 3,686 reviews	Search Qatar Airways flights
Japan Airlines	PriceFrom $966	Free Cancellation	Rating 8.3 1,660 reviews	Search Japan Airlines flights
American Airlines	PriceFrom $979	Free Cancellation	Rating 7.2 11,053 reviews	Search American Airlines flights
United Airlines	PriceFrom $984	Free Cancellation	Rating 7.4 9,103 reviews	Search United Airlines flights
Cathay Pacific	PriceFrom $984	Free Cancellation	Rating 7.6 1,103 reviews	Search Cathay Pacific flights
ANA	PriceFrom $1,007	Free Cancellation	Rating 8.4 1,034 reviews	Search ANA flights
Delta	PriceFrom $1,058	Free Cancellation	Rating 7.9 8,014 reviews	Search Delta flights
Air Canada	PriceFrom $1,280	Free Cancellation	Rating 7.1 10,551 reviews	Search Air Canada flights
Finnair	PriceFrom $1,356	Free Cancellation	Rating 7.6 1,339 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.