What is the cheapest airline that flies from Lambert-St Louis to Vietnam?

United Airlines, Delta, and China Southern are the most popular carriers operating from Lambert-St Louis to Vietnam

What airlines fly to Vietnam?

United Airlines, Delta and ANA are the top three most popular airlines that fly to Vietnam from St. Louis according to our data. United Airlines is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Vietnam. Keep in mind that there are 6 different airlines that fly to Vietnam on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Lambert-St Louis Airport to Vietnam?

Prices for flights from Lambert-St Louis Airport to Vietnam are updated daily.

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

As of October 2026, there are 6 operators available to choose from for flights from Lambert-St Louis Airport to Vietnam.

How old do you have to be to fly from Lambert-St Louis Airport to Vietnam?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Vietnam.

What documentation or ID do you need to fly to Vietnam?

The required travel and health documents for your Vietnam 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 Vietnam. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$503 Cheap Flights from St. Louis to Vietnam in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Vietnam

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:23 am - 10:05 amSTL Lambert-St Louis-HAN Hanoi Noibai

37h 42m2 stops Chicago O'Hare Intl Hong Kong Intl

7:25 pm - 11:57 pmHAN Hanoi Noibai-STL Lambert-St Louis

41h 32m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,093Multiple Airlines

Mon, Mar 1 - Wed, Mar 10

6:00 am - 3:45 pmSTL Lambert-St Louis-HAN Hanoi Noibai

44h 45m2 stops Seattle/Tacoma Intl Hong Kong Intl

10:30 am - 11:33 pmHAN Hanoi Noibai-STL Lambert-St Louis

26h 03m2 stops Hong Kong Intl Dallas/Fort Worth

$1,129Multiple Airlines

Mon, Nov 9 - Mon, Nov 16

6:00 am - 3:45 pmSTL Lambert-St Louis-HAN Hanoi Noibai

44h 45m2 stops Seattle/Tacoma Intl Hong Kong Intl

10:30 am - 8:19 pmHAN Hanoi Noibai-STL Lambert-St Louis

22h 49m2 stops Hong Kong Intl Dallas/Fort Worth

$1,152Cathay Pacific

Mon, Nov 9 - Mon, Nov 16

6:01 am - 12:30 amSTL Lambert-St Louis-SGN Ho Chi Minh City

29h 29m2 stops Los Angeles Hong Kong Intl

7:15 am - 11:36 pmSGN Ho Chi Minh City-STL Lambert-St Louis

29h 21m2 stops Hong Kong Intl Los Angeles

$1,171Cathay Pacific

Tue, Jan 12 - Tue, Feb 9

3:40 pm - 11:15 pmSTL Lambert-St Louis-SGN Ho Chi Minh City

43h 35m2 stops Atlanta Hartsfield-Jackson Incheon Intl

11:45 pm - 12:36 amSGN Ho Chi Minh City-STL Lambert-St Louis

36h 51m2 stops Incheon Intl Salt Lake City

$1,175Delta

Sat, Apr 10 - Sat, Apr 24

6:00 am - 11:50 pmSTL Lambert-St Louis-SGN Ho Chi Minh City

28h 50m2 stops Atlanta Hartsfield-Jackson Incheon Intl

7:55 am - 12:05 amSGN Ho Chi Minh City-STL Lambert-St Louis

29h 10m2 stops Incheon Intl Atlanta Hartsfield-Jackson

$1,175Delta

Tue, Dec 8 - Tue, Dec 15

6:15 am - 9:55 pmSTL Lambert-St Louis-SGN Ho Chi Minh City

27h 40m2 stops Houston George Bush Intcntl Tokyo Haneda

11:15 pm - 10:06 pmSGN Ho Chi Minh City-STL Lambert-St Louis

34h 51m2 stops Tokyo Haneda Houston George Bush Intcntl

$1,180United Airlines

Sat, Apr 10 - Sat, Apr 24

9:05 am - 9:55 pmSTL Lambert-St Louis-SGN Ho Chi Minh City

47h 50m2 stops Chicago O'Hare Intl Tokyo Haneda

11:30 pm - 7:27 pmSGN Ho Chi Minh City-STL Lambert-St Louis

32h 57m2 stops Tokyo Haneda Washington, D.C. Dulles Intl

$1,180United Airlines

Wed, Jan 6 - Mon, Feb 15

7:18 am - 9:55 pmSTL Lambert-St Louis-SGN Ho Chi Minh City

49h 37m2 stops Chicago O'Hare Intl Tokyo Haneda

11:30 pm - 2:06 pmSGN Ho Chi Minh City-STL Lambert-St Louis

27h 36m2 stops Tokyo Haneda Houston George Bush Intcntl

$1,203ANA

Sat, Jan 2 - Mon, Feb 8

8:05 am - 9:55 pmSTL Lambert-St Louis-SGN Ho Chi Minh City

48h 50m2 stops Chicago O'Hare Intl Tokyo Haneda

11:30 pm - 2:06 pmSGN Ho Chi Minh City-STL Lambert-St Louis

27h 36m2 stops Tokyo Haneda Houston George Bush Intcntl

$1,325ANA

Mon, Jan 4 - Thu, Feb 4

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United Airlines flights from St. Louis to Vietnam

Our best United Airlines deals on St. Louis to Vietnam flight tickets

United Airlines

Jan 6

STL9:05 amLambert-St Louis

47h 50m

2 stops

SGN9:55 pmHo Chi Minh City

Feb 15

SGN11:30 pmHo Chi Minh City

32h 57m

2 stops

STL7:27 pmLambert-St Louis

$1,180

United Airlines

Nov 12

STL8:30 amLambert-St Louis

48h 25m

2 stops

SGN9:55 pmHo Chi Minh City

Nov 16

SGN7:30 amHo Chi Minh City

27h 10m

2 stops

STL9:40 pmLambert-St Louis

$1,181

United Airlines

Jan 4

STL6:09 pmLambert-St Louis

40h 01m

3 stops

SGN11:10 pmHo Chi Minh City

Feb 2

SGN11:30 pmHo Chi Minh City

35h 07m

2 stops

STL9:37 pmLambert-St Louis

$1,184

Cathay Pacific flights from St. Louis to Vietnam

Our best Cathay Pacific deals on St. Louis to Vietnam flight tickets

Cathay Pacific

Nov 9

STL6:00 amLambert-St Louis

44h 45m

2 stops

HAN3:45 pmHanoi Noibai

Nov 16

HAN10:30 amHanoi Noibai

22h 49m

2 stops

STL8:19 pmLambert-St Louis

$1,152

Cathay Pacific

Jan 12

STL6:01 amLambert-St Louis

29h 29m

2 stops

SGN12:30 amHo Chi Minh City

Feb 9

SGN7:15 amHo Chi Minh City

29h 21m

2 stops

STL11:36 pmLambert-St Louis

$1,171

Cathay Pacific

Nov 12

STL6:00 amLambert-St Louis

39h 05m

2 stops

HAN10:05 amHanoi Noibai

Nov 16

HAN10:30 amHanoi Noibai

22h 49m

2 stops

STL8:19 pmLambert-St Louis

$1,174

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisHanoi

STL Lambert-St Louis - HAN Hanoi Noibai

STLHAN

Lambert-St Louis

Mon 3/1

7:23 am-10:05 am

2 stops37h 42m

Hanoi Noibai

Wed 3/10

7:25 pm-11:57 pm

2 stops41h 32m

$1,093

St. LouisHanoi

STL Lambert-St Louis - HAN Hanoi Noibai

STLHAN

Lambert-St Louis

Mon 11/9

6:00 am-3:45 pm

2 stops44h 45m

Hanoi Noibai

Mon 11/16

10:30 am-11:33 pm

2 stops26h 03m

$1,129

St. LouisHanoi

STL Lambert-St Louis - HAN Hanoi Noibai

STLHAN

Lambert-St Louis

Mon 11/9

6:00 am-3:45 pm

2 stops44h 45m

Hanoi Noibai

Mon 11/16

10:30 am-8:19 pm

2 stops22h 49m

$1,152

St. LouisHo Chi Minh City

STL Lambert-St Louis - SGN Ho Chi Minh City

STLSGN

Lambert-St Louis

Tue 1/12

6:01 am-12:30 am

2 stops29h 29m

Ho Chi Minh City

Tue 2/9

7:15 am-11:36 pm

2 stops29h 21m

$1,171

St. LouisHo Chi Minh City

STL Lambert-St Louis - SGN Ho Chi Minh City

STLSGN

Lambert-St Louis

Sat 4/10

3:40 pm-11:15 pm

2 stops43h 35m

Ho Chi Minh City

Sat 4/24

11:45 pm-12:36 am

2 stops36h 51m

$1,175

Quickest round-trip

St. LouisHo Chi Minh City

STL Lambert-St Louis - SGN Ho Chi Minh City

STLSGN

Lambert-St Louis

Tue 12/8

6:00 am-11:50 pm

2 stops28h 50m

Ho Chi Minh City

Tue 12/15

7:55 am-12:05 am

2 stops29h 10m

$1,175

St. LouisHo Chi Minh City

STL Lambert-St Louis - SGN Ho Chi Minh City

STLSGN

Lambert-St Louis

Sat 4/10

6:15 am-9:55 pm

2 stops27h 40m

Ho Chi Minh City

Sat 4/24

11:15 pm-10:06 pm

2 stops34h 51m

$1,180

St. LouisHo Chi Minh City

STL Lambert-St Louis - SGN Ho Chi Minh City

STLSGN

Lambert-St Louis

Wed 1/6

9:05 am-9:55 pm

2 stops47h 50m

Ho Chi Minh City

Mon 2/15

11:30 pm-7:27 pm

2 stops32h 57m

$1,180

St. LouisHo Chi Minh City

STL Lambert-St Louis - SGN Ho Chi Minh City

STLSGN

Lambert-St Louis

Sat 1/2

7:18 am-9:55 pm

2 stops49h 37m

Ho Chi Minh City

Mon 2/8

11:30 pm-2:06 pm

2 stops27h 36m

$1,203

St. LouisHo Chi Minh City

STL Lambert-St Louis - SGN Ho Chi Minh City

STLSGN

Lambert-St Louis

Mon 1/4

8:05 am-9:55 pm

2 stops48h 50m

Ho Chi Minh City

Thu 2/4

11:30 pm-2:06 pm

2 stops27h 36m

$1,325

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Vietnam

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

Prices

Airlines

What is the cheapest month to fly to Vietnam?

The month of April is, on average, the cheapest month to fly to Vietnam from St. Louis, with most prices found around $1,073. If you don’t want to visit Vietnam in April, then you should wait until March to fly from St. Louis, when ticket prices are also cheap, with an average price of $1,110.

How far in advance should I book a flight from St. Louis to Vietnam?

You are more likely to see cheaper flights to Vietnam from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Vietnam for around $1,266 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Vietnam from St. Louis for as low as $1,043 on momondo.

Cheap St. Louis to Vietnam flight deals and tips

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

Best Price Found	$503
Fastest flight time	28h 50m
Direct flights	None

The best one-way flight to Vietnam from St. Louis in the past 72 hours is $503. The best round-trip flight deal from St. Louis to Vietnam found on momondo in the last 72 hours is $1,093.

The fastest flight from St. Louis to Vietnam takes 28h 50m

There are no direct flights from St. Louis to Vietnam. There are no popular flight routes from St. Louis to Vietnam.

Search flight deals

Frequently asked questions about flying from St. Louis to Vietnam

When did momondo last update prices for flights from Lambert-St Louis Airport to Vietnam?
Prices for flights from Lambert-St Louis Airport to Vietnam are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Vietnam?
As of October 2026, there are 6 operators available to choose from for flights from Lambert-St Louis Airport to Vietnam.
How old do you have to be to fly from Lambert-St Louis Airport to Vietnam?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Vietnam.
What documentation or ID do you need to fly to Vietnam?
The required travel and health documents for your Vietnam 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 Vietnam. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from St. Louis to Vietnam

Compare and see reviews for airlines that fly from St. Louis to Vietnam with momondo

Airline	Rating	Free Cancellation	Price
Japan Airlines	PriceFrom $561	Free Cancellation	Rating 8.3 1,947 reviews	Search Japan Airlines flights
Cathay Pacific	PriceFrom $936	Free Cancellation	Rating 7.6 1,526 reviews	Search Cathay Pacific flights
United Airlines	PriceFrom $948	Free Cancellation	Rating 7.3 10,443 reviews	Search United Airlines flights
ANA	PriceFrom $998	Free Cancellation	Rating 8.3 1,338 reviews	Search ANA flights
American Airlines	PriceFrom $1,009	Free Cancellation	Rating 7.0 12,190 reviews	Search American Airlines flights
Delta	PriceFrom $1,110	Free Cancellation	Rating 7.8 8,680 reviews	Search Delta flights

Why use momondo?

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

It is quick and easy to find St. Louis to Vietnam flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Vietnam that suits you.

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

Yes. momondo enables you to select and highlight flights to Vietnam from St. Louis with this policy.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Vietnam.

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

Of course. momondo tracks the price of St. Louis to Vietnam flights. All you need is a valid email address and we will do the rest; it is that quick and easy.