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Cheap flights from St. Louis to Bangkok from $351

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Bangkok departing on 9/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

American Airlines Logo
8:50 am - 11:00 pmSTL-BKK
26h 10m2 stops
American Airlines Logo
8:05 am - 10:50 pmBKK-STL
26h 45m2 stops
$915American Airlines
Find Deal
Mon, Sep 15 - Mon, Sep 22
American Airlines Logo
8:50 am - 11:00 pmSTL-BKK
26h 10m2 stops
American Airlines Logo
8:05 am - 10:23 pmBKK-STL
26h 18m2 stops
$940American Airlines
Find Deal
Mon, Sep 8 - Thu, Sep 11
Japan Airlines Logo
7:23 am - 11:00 pmSTL-BKK
27h 37m2 stops
Japan Airlines Logo
10:05 pm - 8:32 pmBKK-STL
34h 27m2 stops
$966Japan Airlines
Find Deal
Wed, Sep 17 - Tue, Sep 23
Cathay Pacific Logo
6:39 am - 11:50 pmSTL-BKK
29h 11m2 stops
Cathay Pacific Logo
8:20 am - 11:49 pmBKK-STL
27h 29m2 stops
$971Cathay Pacific
Find Deal
Tue, Oct 14 - Mon, Oct 27
Cathay Pacific Logo
6:39 am - 10:00 amSTL-BKK
39h 21m2 stops
Cathay Pacific Logo
7:00 pm - 8:26 pmBKK-STL
37h 26m2 stops
$972Cathay Pacific
Find Deal
Tue, Oct 14 - Wed, Oct 22
Delta Logo
8:40 am - 1:05 amSTL-BKK
28h 25m2 stops
Delta Logo
2:35 am - 11:24 pmBKK-STL
32h 49m2 stops
$978Delta
Find Deal
Mon, Sep 15 - Sun, Sep 21
Japan Airlines Logo
8:05 pm - 3:10 pmSTL-BKK
31h 05m2 stops
Japan Airlines Logo
8:05 am - 4:47 pmBKK-STL
21h 42m2 stops
$991Japan Airlines
Find Deal
Mon, Oct 6 - Tue, Nov 4
United Airlines Logo
9:00 am - 11:25 amSTL-BKK
37h 25m3 stops
United Airlines Logo
4:55 pm - 10:51 amBKK-STL
30h 56m3 stops
$998United Airlines
Find Deal
Tue, Nov 11 - Tue, Nov 25
United Airlines Logo
5:29 pm - 11:25 amSTL-BKK
28h 56m2 stops
United Airlines Logo
4:55 pm - 10:07 amBKK-STL
30h 12m3 stops
$1,006United Airlines
Find Deal
Tue, Nov 11 - Tue, Nov 25
Delta Logo
6:00 am - 11:25 pmSTL-BKK
29h 25m2 stops
Delta Logo
2:35 am - 11:24 pmBKK-STL
32h 49m2 stops
$1,028Delta
Find Deal
Mon, Sep 8 - Wed, Sep 10

United Airlines flights from St. Louis to Bangkok

Our best United Airlines deals on St. Louis to Bangkok flight tickets
United Airlines
Nov 11
STL9:00 amLambert-St Louis
37h 25m
3 stops
BKK11:25 amBangkok Suvarnabhumi
Nov 25
BKK4:55 pmBangkok Suvarnabhumi
30h 56m
3 stops
STL10:51 amLambert-St Louis
$998
Find similar
United Airlines
Nov 11
STL5:29 pmLambert-St Louis
28h 56m
2 stops
BKK11:25 amBangkok Suvarnabhumi
Nov 25
BKK4:55 pmBangkok Suvarnabhumi
30h 12m
3 stops
STL10:07 amLambert-St Louis
$1,006
Find similar
United Airlines
Sep 17
STL8:10 amLambert-St Louis
32h 25m
2 stops
BKK4:35 amBangkok Suvarnabhumi
Sep 27
BKK7:00 amBangkok Suvarnabhumi
26h 58m
3 stops
STL9:58 pmLambert-St Louis
$1,027
Find similar

Japan Airlines flights from St. Louis to Bangkok

Our best Japan Airlines deals on St. Louis to Bangkok flight tickets
Japan Airlines
Sep 17
STL7:23 amLambert-St Louis
27h 37m
2 stops
BKK11:00 pmBangkok Suvarnabhumi
Sep 23
BKK10:05 pmBangkok Suvarnabhumi
34h 27m
2 stops
STL8:32 pmLambert-St Louis
$966
Find similar
Japan Airlines
Oct 6
STL8:05 pmLambert-St Louis
31h 05m
2 stops
BKK3:10 pmBangkok Suvarnabhumi
Nov 4
BKK8:05 amBangkok Suvarnabhumi
21h 42m
2 stops
STL4:47 pmLambert-St Louis
$991
Find similar
Japan Airlines
Jan 7
STL6:00 amLambert-St Louis
34h 00m
2 stops
BKK5:00 amBangkok Suvarnabhumi
Mar 3
BKK1:10 amBangkok Suvarnabhumi
34h 58m
2 stops
STL11:08 pmLambert-St Louis
$1,002
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Bangkok 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, momondo users made 832,500 searches. Data last updated August 26, 2025.
Use the filters below to find and compare flights from St. Louis to Bangkok that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 9/15

8:50 am-11:00 pm

2 stops26h 10m

Bangkok Suvarnabhumi

Mon 9/22

8:05 am-10:50 pm

2 stops26h 45m

$915

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 9/8

8:50 am-11:00 pm

2 stops26h 10m

Bangkok Suvarnabhumi

Thu 9/11

8:05 am-10:23 pm

2 stops26h 18m

$940

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 9/17

7:23 am-11:00 pm

2 stops27h 37m

Bangkok Suvarnabhumi

Tue 9/23

10:05 pm-8:32 pm

2 stops34h 27m

$966

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 10/14

6:39 am-11:50 pm

2 stops29h 11m

Bangkok Suvarnabhumi

Mon 10/27

8:20 am-11:49 pm

2 stops27h 29m

$971

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 10/14

6:39 am-10:00 am

2 stops39h 21m

Bangkok Suvarnabhumi

Wed 10/22

7:00 pm-8:26 pm

2 stops37h 26m

$972

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 9/15

8:40 am-1:05 am

2 stops28h 25m

Bangkok Suvarnabhumi

Sun 9/21

2:35 am-11:24 pm

2 stops32h 49m

$978

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 10/6

8:05 pm-3:10 pm

2 stops31h 05m

Bangkok Suvarnabhumi

Tue 11/4

8:05 am-4:47 pm

2 stops21h 42m

$991

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 11/11

9:00 am-11:25 am

3 stops37h 25m

Bangkok Suvarnabhumi

Tue 11/25

4:55 pm-10:51 am

3 stops30h 56m

$998

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 11/11

5:29 pm-11:25 am

2 stops28h 56m

Bangkok Suvarnabhumi

Tue 11/25

4:55 pm-10:07 am

3 stops30h 12m

$1,006

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 9/8

6:00 am-11:25 pm

2 stops29h 25m

Bangkok Suvarnabhumi

Wed 9/10

2:35 am-11:24 pm

2 stops32h 49m

$1,028

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Bangkok from

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

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 February instead. Flights to Bangkok in February, while not as cheap as those in January, still average around $1,155.

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 $1,330 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 $908 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

Direct flights

None
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 29m 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?

  • 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 AirwaysPriceFrom $897Free CancellationRating
7.4
3,608 reviews
Search Qatar Airways flights
American AirlinesPriceFrom $954Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
ANAPriceFrom $1,053Free CancellationRating
8.4
943 reviews
Search ANA flights
DeltaPriceFrom $1,058Free CancellationRating
7.9
7,979 reviews
Search Delta flights
United AirlinesPriceFrom $1,067Free CancellationRating
7.4
8,943 reviews
Search United Airlines flights
Japan AirlinesPriceFrom $1,080Free CancellationRating
8.3
1,552 reviews
Search Japan Airlines flights
Air CanadaPriceFrom $1,176Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
Cathay PacificPriceFrom $1,228Free CancellationRating
7.6
975 reviews
Search Cathay Pacific flights
FinnairPriceFrom $1,289Free CancellationRating
7.6
1,320 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.

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Find better results for your trip to Thailand

Fly into one of these airports located in Bangkok

Airports listed have a maximum distance of 15.4 mi from Bangkok
Bangkok Suvarnabhumi Airport
Bangkok Don Mueang Intl Airport