฿4,811+ Cheap flights from St. Louis

This is the cheapest return flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — BKK
14 Feb — 21 Feb1
1 adult
1 adult, Economy, 0 bags

Find flights from St. Louis

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis
Explore the most affordable flight options available from St. Louis. Find the lowest fares based on data from user searches, with prices last updated on 15 January 2026.

Mon 2/307:00
STL
-
BKK
2 stops28h 55m
เดลต้า
Mon 9/321:30
BKK
-
STL
2 stops35h 36m
เดลต้า
Deal found 15/1฿27,736
Thu 5/206:35
STL
-
BKK
2 stops29h 10m
เดลต้า
Sat 7/303:05
BKK
-
STL
2 stops32h 53m
เดลต้า
Deal found 15/1฿28,805
Wed 25/217:50
STL
-
BKK
2 stops42h 05m
เดลต้า
Sat 7/303:05
BKK
-
STL
2 stops32h 53m
เดลต้า
Deal found 14/1฿28,963
Mon 16/207:00
STL
-
BKK
2 stops28h 55m
เดลต้า
Mon 23/223:15
BKK
-
STL
2 stops38h 10m
เดลต้า
Deal found 14/1฿29,277
Thu 29/108:30
STL
-
BKK
3 stops37h 55m
United Airlines
Sun 8/216:55
BKK
-
STL
3 stops41h 03m
United Airlines
Deal found 14/1฿29,434
Mon 20/407:05
STL
-
BKK
2 stops27h 55m
Japan Airlines
Mon 4/508:05
BKK
-
STL
2 stops27h 54m
Japan Airlines
Deal found 14/1฿29,592
Mon 26/109:57
STL
-
BKK
3 stops36h 28m
United Airlines
Thu 29/116:55
BKK
-
STL
3 stops33h 21m
United Airlines
Deal found 13/1฿29,717
Mon 26/113:35
STL
-
BKK
2 stops37h 50m
Japan Airlines
Thu 29/108:05
BKK
-
STL
2 stops41h 58m
Japan Airlines
Deal found 13/1฿29,969
Mon 13/416:20
STL
-
BKK
2 stops31h 50m
China Airlines
Mon 20/413:20
BKK
-
STL
2 stops46h 39m
China Airlines
Deal found 15/1฿30,220
Thu 29/106:00
STL
-
BKK
2 stops28h 35m
American Airlines
Sun 1/208:05
BKK
-
STL
2 stops25h 08m
American Airlines
Deal found 15/1฿30,472
Fri 30/108:45
STL
-
BKK
3 stops37h 40m
United Airlines
Sun 8/216:55
BKK
-
STL
3 stops41h 03m
United Airlines
Deal found 14/1฿30,503
Wed 1/407:15
STL
-
HKT
2 stops26h 55m
เดลต้า
Thu 30/423:25
HKT
-
STL
2 stops36h 08m
เดลต้า
Deal found 15/1฿33,491

Find flights from St. Louis within your budget

 
Find flights departing from St. Louis that match your specified budget. Filter results by price range, allowing you to narrow down options and find flights that fit within your financial constraints. Please note that the search results are based on data from user searches, with fares last updated on 15 January 2026. In the last 7 days, Cheapflights users made a total of 17,341 searches

Fly to

Suvarnabhumi

Route

Depart

Return

Price

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 1/2

18:57-00:55

2 stops40h 58m

Bangkok Suvarnabhumi

Sun 8/2

21:30-23:25

2 stops38h 55m

฿27,736

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 25/2

06:35-00:45

2 stops29h 10m

Bangkok Suvarnabhumi

Sat 7/3

03:05-20:06

2 stops30h 01m

฿28,805

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 16/2

07:00-00:55

2 stops28h 55m

Bangkok Suvarnabhumi

Mon 23/2

23:15-00:25

2 stops38h 10m

฿29,277

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 26/1

15:11-11:25

3 stops31h 14m

Bangkok Suvarnabhumi

Thu 29/1

16:55-14:30

3 stops34h 35m

฿29,717

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 26/1

13:35-16:25

2 stops37h 50m

Bangkok Suvarnabhumi

Thu 29/1

08:05-13:03

2 stops41h 58m

฿29,969

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 13/4

16:20-12:10

2 stops31h 50m

Bangkok Suvarnabhumi

Mon 20/4

13:20-23:59

2 stops46h 39m

฿30,220

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 1/2

14:45-11:25

3 stops31h 40m

Bangkok Suvarnabhumi

Sun 8/2

16:55-05:11

2 stops25h 16m

฿30,787

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 22/4

18:59-21:45

2 stops38h 46m

Bangkok Suvarnabhumi

Thu 15/10

09:50-00:36

2 stops26h 46m

฿30,818

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Fri 30/1

06:45-11:25

2 stops39h 40m

Bangkok Suvarnabhumi

Sun 8/2

16:55-05:11

2 stops25h 16m

฿30,912

St. LouisPhuket City

STL - HKT

STLHKT

Lambert-St Louis

Wed 1/4

07:15-22:10

2 stops26h 55m

Phuket City

Thu 30/4

23:25-23:33

2 stops36h 08m

฿33,491

Flights are sorted by cheapest return flights first.

Deals found on 14/1

Showing 1-10 of 30 results
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Best time to book a flight from St. Louis

Have a flexible travel schedule? Discover the best time to fly from St. Louis with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from St. Louis

Get recent, data-driven insights about flights from St. Louis including ideal travel times, pricing trends, and more.

When is the best time to book a flight from St. Louis?

Use this chart to determine the optimal time to book a return flight from St. Louis to Suvarnabhumi. Price data was last updated on 9 January 2026.

Booking 53 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis?

Currently, February is the cheapest month in which you can book a flight from St. Louis (average of ฿29,937). Flying from St. Louis in June will prove the most costly (average of ฿40,032). There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.

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Related info for your journey

Access useful and relevant information related to your journey from St. Louis. This can include details such as airport transportation, visa requirements, travel insurance, luggage regulations, and any other information that can ensure a smooth and hassle-free travel experience. Please note that the information is based on general guidance and may need to be verified with official sources. Data last updated 15 January 2026.

  • What are the most popular destinations to fly to from St. Louis?

    The most selected flight destinations from St. Louis for the current month are Cancún, Denver, Atlanta. While Denver, Cancún, Atlanta are the top choices made by travellers year-round.

  • What is the cheapest month to fly from St. Louis?

    At the present moment the cheapest month to fly from St. Louis is currently February; with June being the most expensive. Prices will vary depending on multiple factors such as booking in advance, airline and departure airports and times.

  • How does Cheapflights help users find flights from St. Louis?

    Cheapflights helps you search for flights from St. Louis via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

  • Why should you use Cheapflights to find cheap flight tickets from St. Louis?

    Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

  • Can Cheapflights find flights from St. Louis with no change fees?

    Cheapflights does show flights with no change fees to all users. To see these options for flights from St. Louis, users can toggle the no change fees filter when performing a flight search.

  • Can Cheapflights notify me if prices for flights from St. Louis become cheaper?

    Yes, Cheapflights offers price alerts on flights from St. Louis so you can book your travels when it’s right. The Price Alerts feature is available by clicking the bell icon next to the flight deals above and providing your email address.

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How does Cheapflights help users find flights from St. Louis?

Cheapflights helps you search for flights from St. Louis via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from St. Louis?

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from St. Louis, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from St. Louis become cheaper?

Yes, Cheapflights offers price alerts on flights from St. Louis so you can book your travels when it’s right. The Price Alerts feature is available by clicking the bell icon next to the flight deals above and providing your email address.

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