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Cheap flights from St. Louis to Southeast Asia from $424

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 Southeast Asia departing on 11/15. 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 Southeast Asia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:14 pm - 4:30 pmSTL-BKK
35h 16m2 stops
Multiple Airlines Logo
1:45 pm - 11:54 pmBKK-STL
23h 09m2 stops
$846Multiple Airlines
Find Deal
Mon, Nov 17 - Sun, Nov 23
Multiple Airlines Logo
7:00 am - 4:30 pmSTL-BKK
44h 30m2 stops
Multiple Airlines Logo
1:45 pm - 11:59 pmBKK-STL
23h 14m2 stops
$854Multiple Airlines
Find Deal
Thu, Nov 13 - Mon, Nov 17
United Airlines Logo
8:00 am - 9:50 pmSTL-SGN
48h 50m2 stops
United Airlines Logo
11:05 pm - 5:54 pmSGN-STL
31h 49m2 stops
$920United Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 24
United Airlines Logo
4:55 pm - 10:55 pmSTL-SGN
41h 00m3 stops
United Airlines Logo
11:05 pm - 4:27 pmSGN-STL
30h 22m2 stops
$924United Airlines
Find Deal
Wed, Nov 12 - Sun, Dec 14
Cathay Pacific Logo
11:05 am - 6:35 pmSTL-SGN
42h 30m2 stops
Cathay Pacific Logo
1:50 pm - 10:24 pmSGN-STL
44h 34m2 stops
$940Cathay Pacific
Find Deal
Tue, Jan 13 - Wed, Mar 18
Cathay Pacific Logo
1:35 pm - 8:25 pmSTL-SGN
65h 50m2 stops
Cathay Pacific Logo
11:35 am - 4:57 pmSGN-STL
42h 22m2 stops
$946Cathay Pacific
Find Deal
Sun, Feb 1 - Sun, Mar 8
Japan Airlines Logo
7:00 am - 5:00 amSTL-BKK
33h 00m2 stops
Japan Airlines Logo
10:05 pm - 1:29 pmBKK-STL
28h 24m2 stops
$989Japan Airlines
Find Deal
Tue, Dec 2 - Wed, Dec 10
Japan Airlines Logo
7:00 am - 5:00 amSTL-BKK
33h 00m2 stops
Japan Airlines Logo
10:05 pm - 1:29 pmBKK-STL
28h 24m2 stops
$990Japan Airlines
Find Deal
Tue, Dec 2 - Wed, Dec 10
ANA Logo
11:20 am - 9:50 pmSTL-SGN
45h 30m2 stops
ANA Logo
11:15 pm - 3:04 pmSGN-STL
27h 49m2 stops
$1,008ANA
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Mon, Jan 19 - Tue, Apr 28
ANA Logo
8:05 am - 11:05 pmSTL-HAN
26h 00m2 stops
ANA Logo
11:35 pm - 2:18 pmHAN-STL
50h 43m2 stops
$1,011ANA
Find Deal
Wed, Jan 21 - Tue, May 5

Delta flights from St. Louis to Southeast Asia

Our best Delta deals on St. Louis to Southeast Asia flight tickets
Delta
Jan 12
STL6:55 pmLambert-St Louis
40h 50m
2 stops
BKK12:45 amBangkok Suvarnabhumi
Feb 1
BKK12:55 amBangkok Suvarnabhumi
35h 44m
2 stops
STL11:39 pmLambert-St Louis
$978
Find similar
Delta
Jan 18
STL10:19 amLambert-St Louis
49h 26m
2 stops
BKK12:45 amBangkok Suvarnabhumi
Feb 1
BKK9:40 amBangkok Suvarnabhumi
43h 59m
2 stops
STL4:39 pmLambert-St Louis
$984
Find similar
Delta
Nov 27
STL3:15 pmLambert-St Louis
44h 40m
2 stops
BKK12:55 amBangkok Suvarnabhumi
Dec 9
BKK2:05 amBangkok Suvarnabhumi
32h 52m
2 stops
STL9:57 pmLambert-St Louis
$1,003
Find similar

Japan Airlines flights from St. Louis to Southeast Asia

Our best Japan Airlines deals on St. Louis to Southeast Asia flight tickets
Japan Airlines
Dec 2
STL7:00 amLambert-St Louis
33h 00m
2 stops
BKK5:00 amBangkok Suvarnabhumi
Dec 10
BKK10:05 pmBangkok Suvarnabhumi
28h 24m
2 stops
STL1:29 pmLambert-St Louis
$989
Find similar
Japan Airlines
Dec 2
STL7:00 amLambert-St Louis
33h 00m
2 stops
BKK5:00 amBangkok Suvarnabhumi
Dec 10
BKK10:05 pmBangkok Suvarnabhumi
28h 24m
2 stops
STL1:29 pmLambert-St Louis
$990
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Southeast Asia 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 3, 2025.
Use the filters below to find and compare flights from St. Louis to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Mon 11/17

4:14 pm-4:30 pm

2 stops35h 16m

Bangkok Suvarnabhumi

Sun 11/23

1:45 pm-11:54 pm

2 stops23h 09m

$846

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Thu 11/13

7:00 am-4:30 pm

2 stops44h 30m

Bangkok Suvarnabhumi

Mon 11/17

1:45 pm-11:59 pm

2 stops23h 14m

$854

St. LouisHo Chi Minh City

STL - SGN

STLSGN

Lambert-St Louis

Wed 12/3

8:00 am-9:50 pm

2 stops48h 50m

Ho Chi Minh City

Wed 12/24

11:05 pm-5:54 pm

2 stops31h 49m

$920

St. LouisHo Chi Minh City

STL - SGN

STLSGN

Lambert-St Louis

Wed 11/12

4:55 pm-10:55 pm

3 stops41h 00m

Ho Chi Minh City

Sun 12/14

11:05 pm-4:27 pm

2 stops30h 22m

$924

St. LouisHo Chi Minh City

STL - SGN

STLSGN

Lambert-St Louis

Tue 1/13

11:05 am-6:35 pm

2 stops42h 30m

Ho Chi Minh City

Wed 3/18

1:50 pm-10:24 pm

2 stops44h 34m

$940

St. LouisHo Chi Minh City

STL - SGN

STLSGN

Lambert-St Louis

Sun 2/1

1:35 pm-8:25 pm

2 stops65h 50m

Ho Chi Minh City

Sun 3/8

11:35 am-4:57 pm

2 stops42h 22m

$946

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 12/2

7:00 am-5:00 am

2 stops33h 00m

Bangkok Suvarnabhumi

Wed 12/10

10:05 pm-1:29 pm

2 stops28h 24m

$989

St. LouisBangkok

STL - BKK

STLBKK

Lambert-St Louis

Tue 12/2

7:00 am-5:00 am

2 stops33h 00m

Bangkok Suvarnabhumi

Wed 12/10

10:05 pm-1:29 pm

2 stops28h 24m

$990

St. LouisHo Chi Minh City

STL - SGN

STLSGN

Lambert-St Louis

Mon 1/19

11:20 am-9:50 pm

2 stops45h 30m

Ho Chi Minh City

Tue 4/28

11:15 pm-3:04 pm

2 stops27h 49m

$1,008

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Wed 1/21

8:05 am-11:05 pm

2 stops26h 00m

Hanoi Noibai

Tue 5/5

11:35 pm-2:18 pm

2 stops50h 43m

$1,011

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 Southeast Asia from

How to get the cheapest flight ticket from St. Louis to Southeast Asia

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 Southeast Asia?

The month of September is, on average, the cheapest month to fly to Southeast Asia from St. Louis, with most prices found around $1,084. If you don’t want to visit Southeast Asia in September, then you should wait until October to fly from St. Louis, when ticket prices are also cheap, with an average price of $1,119.

What is the cheapest day to depart on your flight to Southeast Asia?

The cheapest day to depart from St. Louis to Southeast Asia is on a Monday when prices can be found for as low as $1,334. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $1,546. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

What is the cheapest time of day to depart on your flight to Southeast Asia?

In the morning is the cheapest time of day to fly from St. Louis to Southeast Asia when you can find flight prices for as low as $1,339. Flying to Southeast Asia in the morning is an ideal time because this is during off-peak travel hours. 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 Southeast Asia?

You are more likely to see cheaper flights to Southeast Asia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia 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 Southeast Asia from St. Louis for as low as $991 on momondo.

Can stopping save me money on St. Louis to Southeast Asia flights?

No. A direct flight is the cheapest option for a flight between St. Louis to Southeast Asia.

Cheap St. Louis to Southeast Asia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Southeast Asia

Direct flights

None
There are no direct flights from St. Louis to Southeast Asia. There are no popular flight routes from St. Louis to Southeast Asia.
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  • When did momondo last update prices for flights from Lambert-St Louis Airport to Southeast Asia?

    Prices for flights from Lambert-St Louis Airport to Southeast Asia were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Southeast Asia?

  • How old do you have to be to fly from Lambert-St Louis Airport to Southeast Asia?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Southeast Asia.

  • What documentation or ID do you need to fly to Southeast Asia?

    The required travel and health documents for your Southeast Asia trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Southeast Asia. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from St. Louis to Southeast Asia?

Best airlines flying from St. Louis to Southeast Asia

Compare and see reviews for airlines that fly from St. Louis to Southeast Asia with momondo
Airline
Rating
Free Cancellation
Price
Korean AirPriceFrom $761Free CancellationRating
8.4
1,158 reviews
Search Korean Air flights
Qatar AirwaysPriceFrom $897Free CancellationRating
7.4
3,659 reviews
Search Qatar Airways flights
Air CanadaPriceFrom $907Free CancellationRating
7.1
10,397 reviews
Search Air Canada flights
Cathay PacificPriceFrom $915Free CancellationRating
7.6
1,048 reviews
Search Cathay Pacific flights
China AirlinesPriceFrom $928Free CancellationRating
8.3
776 reviews
Search China Airlines flights
Japan AirlinesPriceFrom $949Free CancellationRating
8.3
1,600 reviews
Search Japan Airlines flights
American AirlinesPriceFrom $966Free CancellationRating
7.2
11,033 reviews
Search American Airlines flights
United AirlinesPriceFrom $970Free CancellationRating
7.4
8,996 reviews
Search United Airlines flights
ANAPriceFrom $986Free CancellationRating
8.4
1,000 reviews
Search ANA flights
DeltaPriceFrom $990Free CancellationRating
7.9
8,001 reviews
Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Southeast Asia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Southeast Asia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Southeast Asia with flexible booking policies on momondo?

Yes. All flights to Southeast Asia from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from St. Louis to Southeast Asia?

Once you have performed a search for St. Louis to Southeast Asia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Southeast Asia right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to Southeast Asia now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Southeast Asia and let you know when they change.

An easier way to manage your Southeast Asia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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