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Cheap flights from St. Louis to Bangkok from $429

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 12/8. 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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Find the cheapest flights from St. Louis to Bangkok

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:55 pm - 12:00 pmSTL-BKK
33h 05m2 stops
Multiple Airlines Logo
5:50 pm - 2:11 pmBKK-STL
56h 21m2 stops
$899Multiple Airlines
Find Deal
Wed, Apr 1 - Thu, Apr 30
Cathay Pacific Logo
7:04 am - 12:05 pmSTL-BKK
40h 01m2 stops
Cathay Pacific Logo
4:55 pm - 11:30 pmBKK-STL
43h 35m2 stops
$970Cathay Pacific
Find Deal
Wed, Jan 7 - Wed, Mar 4
United Airlines Logo
8:15 am - 5:10 amSTL-BKK
31h 55m2 stops
United Airlines Logo
9:10 am - 7:27 pmBKK-STL
23h 17m2 stops
$983United Airlines
Find Deal
Mon, Dec 29 - Thu, Jan 8
Japan Airlines Logo
7:04 am - 5:00 amSTL-BKK
32h 56m2 stops
Japan Airlines Logo
1:10 am - 11:59 pmBKK-STL
35h 49m2 stops
$991Japan Airlines
Find Deal
Mon, Jan 12 - Tue, Jan 20
United Airlines Logo
5:18 pm - 4:35 amSTL-BKK
47h 17m2 stops
United Airlines Logo
7:00 am - 12:20 pmBKK-STL
41h 20m2 stops
$997United Airlines
Find Deal
Wed, Apr 1 - Thu, Apr 30
Japan Airlines Logo
7:15 am - 4:25 pmSTL-BKK
44h 10m2 stops
Japan Airlines Logo
1:10 am - 11:48 pmBKK-STL
35h 38m2 stops
$1,012Japan Airlines
Find Deal
Wed, Jan 7 - Tue, Mar 3
Qatar Airways Logo
6:00 am - 6:15 amSTL-BKK
35h 15m2 stops
Qatar Airways Logo
3:00 am - 6:11 pmBKK-STL
28h 11m2 stops
$1,023Qatar Airways
Find Deal
Wed, Jan 7 - Tue, Mar 3
Delta Logo
6:35 am - 11:20 pmSTL-BKK
27h 45m2 stops
Delta Logo
12:55 am - 4:50 pmBKK-STL
51h 55m2 stops
$1,034Delta
Find Deal
Thu, Mar 5 - Sun, Mar 8
Qatar Airways Logo
6:00 am - 6:40 amSTL-BKK
35h 40m2 stops
Qatar Airways Logo
3:00 am - 6:11 pmBKK-STL
28h 11m2 stops
$1,055Qatar Airways
Find Deal
Wed, Jan 7 - Tue, Mar 3
Delta Logo
6:00 am - 12:55 amSTL-BKK
29h 55m2 stops
Delta Logo
12:55 am - 6:17 pmBKK-STL
30h 22m2 stops
$1,148Delta
Find Deal
Mon, Dec 1 - Sun, Dec 21

Japan Airlines flights from St. Louis to Bangkok

Our best Japan Airlines deals on St. Louis to Bangkok flight tickets
Japan Airlines
Jan 12
STL7:04 amLambert-St Louis
32h 56m
2 stops
BKK5:00 amBangkok Suvarnabhumi
Jan 20
BKK1:10 amBangkok Suvarnabhumi
35h 49m
2 stops
STL11:59 pmLambert-St Louis
$991
Find similar
Japan Airlines
Jan 7
STL7:15 amLambert-St Louis
44h 10m
2 stops
BKK4:25 pmBangkok Suvarnabhumi
Mar 3
BKK1:10 amBangkok Suvarnabhumi
35h 38m
2 stops
STL11:48 pmLambert-St Louis
$1,012
Find similar

United Airlines flights from St. Louis to Bangkok

Our best United Airlines deals on St. Louis to Bangkok flight tickets
United Airlines
Dec 29
STL8:15 amLambert-St Louis
31h 55m
2 stops
BKK5:10 amBangkok Suvarnabhumi
Jan 8
BKK9:10 amBangkok Suvarnabhumi
23h 17m
2 stops
STL7:27 pmLambert-St Louis
$983
Find similar
United Airlines
Apr 1
STL5:18 pmLambert-St Louis
47h 17m
2 stops
BKK4:35 amBangkok Suvarnabhumi
Apr 30
BKK7:00 amBangkok Suvarnabhumi
41h 20m
2 stops
STL12:20 pmLambert-St Louis
$997
Find similar
United Airlines
Jan 28
STL11:22 amLambert-St Louis
35h 03m
3 stops
BKK11:25 amBangkok Suvarnabhumi
Mar 30
BKK3:40 pmBangkok Suvarnabhumi
34h 38m
3 stops
STL2:18 pmLambert-St Louis
$998
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 November 6, 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

Wed 4/1

2:55 pm-12:00 pm

2 stops33h 05m

Bangkok Suvarnabhumi

Thu 4/30

5:50 pm-2:11 pm

2 stops56h 21m

$899

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 1/7

7:04 am-12:05 pm

2 stops40h 01m

Bangkok Suvarnabhumi

Wed 3/4

4:55 pm-11:30 pm

2 stops43h 35m

$970

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 12/29

8:15 am-5:10 am

2 stops31h 55m

Bangkok Suvarnabhumi

Thu 1/8

9:10 am-7:27 pm

2 stops23h 17m

$983

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 1/12

7:04 am-5:00 am

2 stops32h 56m

Bangkok Suvarnabhumi

Tue 1/20

1:10 am-11:59 pm

2 stops35h 49m

$991

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 4/1

5:18 pm-4:35 am

2 stops47h 17m

Bangkok Suvarnabhumi

Thu 4/30

7:00 am-12:20 pm

2 stops41h 20m

$997

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 1/7

7:15 am-4:25 pm

2 stops44h 10m

Bangkok Suvarnabhumi

Tue 3/3

1:10 am-11:48 pm

2 stops35h 38m

$1,012

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 1/7

6:00 am-6:15 am

2 stops35h 15m

Bangkok Suvarnabhumi

Tue 3/3

3:00 am-6:11 pm

2 stops28h 11m

$1,023

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 3/5

6:35 am-11:20 pm

2 stops27h 45m

Bangkok Suvarnabhumi

Sun 3/8

12:55 am-4:50 pm

2 stops51h 55m

$1,034

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 1/7

6:00 am-6:40 am

2 stops35h 40m

Bangkok Suvarnabhumi

Tue 3/3

3:00 am-6:11 pm

2 stops28h 11m

$1,055

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 12/1

6:00 am-12:55 am

2 stops29h 55m

Bangkok Suvarnabhumi

Sun 12/21

12:55 am-6:17 pm

2 stops30h 22m

$1,148

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 September, then book flights to Bangkok from St. Louis during October instead. Flights to Bangkok in October, while not as cheap as those in September, still average around $1,119.

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 $1,280 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

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 27h 45m 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
3,661 reviews
Search Qatar Airways flights
American AirlinesPriceFrom $979Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
Japan AirlinesPriceFrom $985Free CancellationRating
8.3
1,604 reviews
Search Japan Airlines flights
United AirlinesPriceFrom $986Free CancellationRating
7.4
9,004 reviews
Search United Airlines flights
ANAPriceFrom $1,007Free CancellationRating
8.4
1,003 reviews
Search ANA flights
DeltaPriceFrom $1,058Free CancellationRating
7.9
8,001 reviews
Search Delta flights
Cathay PacificPriceFrom $1,060Free CancellationRating
7.6
1,055 reviews
Search Cathay Pacific flights
Air CanadaPriceFrom $1,176Free CancellationRating
7.1
10,415 reviews
Search Air Canada flights
FinnairPriceFrom $1,289Free CancellationRating
7.6
1,335 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