฿4,277+ 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 16/2. 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
5 Feb — 12 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 6 January 2026.

Wed 4/211:20STL - BKK
3 stops35h 05mUnited Airlines
Wed 11/216:55BKK - STL
3 stops41h 45mUnited Airlines
Deal found 6/1฿28,157
Mon 26/116:35STL - BKK
3 stops29h 50mUnited Airlines
Thu 29/116:55BKK - STL
3 stops29h 27mUnited Airlines
Deal found 5/1฿29,499
Wed 4/208:31STL - BKK
2 stops42h 54mJapan Airlines
Wed 11/222:05BKK - STL
2 stops28h 38mJapan Airlines
Deal found 6/1฿29,936
Sun 1/208:31STL - BKK
2 stops26h 04mAmerican Airlines
Sun 8/208:05BKK - STL
2 stops23h 09mAmerican Airlines
Deal found 6/1฿29,967
Thu 29/111:20STL - BKK
3 stops35h 05mUnited Airlines
Wed 11/216:55BKK - STL
3 stops29h 28mUnited Airlines
Deal found 5/1฿30,248
Sat 24/111:20STL - BKK
3 stops35h 05mUnited Airlines
Sat 7/216:55BKK - STL
3 stops29h 27mUnited Airlines
Deal found 6/1฿30,280
Wed 21/117:04STL - BKK
2 stops42h 51mเดลต้า
Wed 28/102:05BKK - STL
2 stops34h 20mเดลต้า
Deal found 5/1฿30,561
Mon 9/208:45STL - BKK
3 stops37h 40mUnited Airlines
Thu 19/216:55BKK - STL
3 stops37h 03mUnited Airlines
Deal found 6/1฿30,654
Sun 1/218:44STL - HKT
2 stops57h 51mCathay Pacific
Sun 8/212:20HKT - STL
2 stops44h 53mCathay Pacific
Deal found 6/1฿31,934
Thu 19/206:38STL - HKT
2 stops39h 42mCathay Pacific
Mon 2/318:35HKT - STL
2 stops42h 24mCathay Pacific
Deal found 6/1฿34,088
Thu 19/206:10STL - HKT
2 stops27h 00mKorean Air
Thu 26/223:40HKT - STL
2 stops36h 56mKorean Air
Deal found 5/1฿35,742
Mon 29/606:00STL - HKT
2 stops28h 10mเดลต้า
Wed 15/723:25HKT - STL
2 stops28h 32mเดลต้า
Deal found 4/1฿47,792

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 6 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

Wed 4/2

11:20-11:25

3 stops35h 05m

Bangkok Suvarnabhumi

Wed 11/2

16:55-21:40

3 stops41h 45m

฿28,157

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 26/1

17:00-11:25

2 stops29h 25m

Bangkok Suvarnabhumi

Thu 29/1

16:55-09:22

3 stops29h 27m

฿29,749

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Wed 4/2

08:31-16:25

2 stops42h 54m

Bangkok Suvarnabhumi

Wed 11/2

22:05-13:43

2 stops28h 38m

฿29,936

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 29/1

11:20-11:25

3 stops35h 05m

Bangkok Suvarnabhumi

Wed 11/2

16:55-09:23

3 stops29h 28m

฿30,248

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sat 24/1

11:20-11:25

3 stops35h 05m

Bangkok Suvarnabhumi

Sat 7/2

16:55-09:22

3 stops29h 27m

฿30,280

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 25/1

16:35-11:25

3 stops29h 50m

Bangkok Suvarnabhumi

Sun 1/2

16:55-05:11

2 stops25h 16m

฿30,529

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Sun 1/2

13:15-11:25

3 stops33h 10m

Bangkok Suvarnabhumi

Sun 8/2

16:55-05:11

2 stops25h 16m

฿30,529

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 9/2

08:45-11:25

3 stops37h 40m

Bangkok Suvarnabhumi

Thu 19/2

16:55-16:58

3 stops37h 03m

฿30,654

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 13/4

16:20-12:10

2 stops31h 50m

Bangkok Suvarnabhumi

Mon 20/4

17:30-23:59

2 stops42h 29m

฿31,154

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 13/4

08:54-09:45

3 stops36h 51m

Bangkok Suvarnabhumi

Mon 20/4

15:40-05:50

2 stops26h 10m

฿31,466

Flights are sorted by cheapest return flights first.

Deals found on 6/1

Showing 1-10 of 29 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 2 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 ฿29,624). Flying from St. Louis in June will prove the most costly (average of ฿39,738). 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 6 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.

  • Where are the cheapest places to fly to from St. Louis?

    Here are some of the cheapest flight destinations from St. Louis:
    Fly from St. Louis to Bangkok from ฿29,499

  • 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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