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Cheap flights from St. Louis to Singapore from $434

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 Singapore departing on 3/11. 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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0 bags

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Find the cheapest flights from St. Louis to Singapore

Cheap round-trip flights

Enter your travel dates to find the best prices.
Cathay Pacific Logo
7:04 am - 12:25 am
STL
-
SIN
27h 21m2 stops
Cathay Pacific Logo
4:45 pm - 11:18 pm
SIN
-
STL
44h 33m2 stops
$993Cathay Pacific
Mon, Feb 9 - Mon, Feb 16
Cathay Pacific Logo
6:43 pm - 9:25 am
STL
-
SIN
48h 42m2 stops
Cathay Pacific Logo
10:00 am - 11:48 pm
SIN
-
STL
27h 48m2 stops
$1,034Cathay Pacific
Sat, Jan 31 - Wed, Feb 18
Cathay Pacific Logo
11:05 am - 5:40 am
STL
-
SIN
28h 35m2 stops
Cathay Pacific Logo
8:40 am - 6:14 pm
SIN
-
STL
47h 34m2 stops
$1,107Cathay Pacific
Fri, Jan 16 - Sat, Jan 31
United Airlines Logo
5:00 pm - 8:00 am
STL
-
SIN
25h 00m1 stop
United Airlines Logo
10:10 am - 4:44 pm
SIN
-
STL
20h 34m1 stop
$1,125United Airlines
Tue, Feb 10 - Tue, Feb 17
American Airlines Logo
11:05 am - 6:35 am
STL
-
SIN
29h 30m2 stops
American Airlines Logo
8:15 am - 7:51 pm
SIN
-
STL
25h 36m2 stops
$1,129American Airlines
Fri, Jan 16 - Sat, Jan 31
United Airlines Logo
1:15 pm - 8:00 am
STL
-
SIN
28h 45m2 stops
United Airlines Logo
10:10 am - 8:26 pm
SIN
-
STL
24h 16m2 stops
$1,130United Airlines
Tue, Feb 10 - Tue, Feb 17
United Airlines Logo
4:49 pm - 8:15 pm
STL
-
SIN
37h 26m2 stops
United Airlines Logo
10:10 am - 10:14 pm
SIN
-
STL
26h 04m3 stops
$1,180United Airlines
Sat, Jan 31 - Wed, Feb 18
United Airlines Logo
6:45 am - 12:55 am
STL
-
SIN
28h 10m2 stops
United Airlines Logo
10:20 pm - 5:11 am
SIN
-
STL
20h 51m1 stop
$1,237United Airlines
Fri, Jan 16 - Sat, Jan 31
United Airlines Logo
7:05 pm - 6:45 am
STL
-
SIN
22h 40m1 stop
United Airlines Logo
9:00 am - 6:24 pm
SIN
-
STL
22h 24m1 stop
$1,316United Airlines
Mon, Apr 20 - Thu, Apr 23
United Airlines Logo
8:54 am - 6:45 am
STL
-
SIN
32h 51m2 stops
United Airlines Logo
8:40 pm - 5:50 am
SIN
-
STL
22h 10m1 stop
$1,320United Airlines
Mon, Apr 20 - Thu, Apr 23

Cathay Pacific flights from St. Louis to Singapore

Our best Cathay Pacific deals on St. Louis to Singapore flight tickets
Cathay Pacific
Feb 9
STL7:04 amLambert-St Louis
27h 21m
2 stops
SIN12:25 amSingapore Changi
Feb 16
SIN4:45 pmSingapore Changi
44h 33m
2 stops
STL11:18 pmLambert-St Louis
$993
Find similar
Cathay Pacific
Jan 31
STL6:43 pmLambert-St Louis
48h 42m
2 stops
SIN9:25 amSingapore Changi
Feb 18
SIN10:00 amSingapore Changi
27h 48m
2 stops
STL11:48 pmLambert-St Louis
$1,034
Find similar
Cathay Pacific
Jan 16
STL11:05 amLambert-St Louis
28h 35m
2 stops
SIN5:40 amSingapore Changi
Jan 31
SIN8:40 amSingapore Changi
47h 34m
2 stops
STL6:14 pmLambert-St Louis
$1,107
Find similar

United Airlines flights from St. Louis to Singapore

Our best United Airlines deals on St. Louis to Singapore flight tickets
United Airlines
Feb 10
STL5:00 pmLambert-St Louis
25h 00m
1 stop
SIN8:00 amSingapore Changi
Feb 17
SIN10:10 amSingapore Changi
20h 34m
1 stop
STL4:44 pmLambert-St Louis
$1,125
Find similar
United Airlines
Feb 10
STL11:20 amLambert-St Louis
30h 40m
2 stops
SIN8:00 amSingapore Changi
Feb 17
SIN10:10 amSingapore Changi
20h 34m
1 stop
STL4:44 pmLambert-St Louis
$1,130
Find similar
United Airlines
Jan 31
STL4:49 pmLambert-St Louis
37h 26m
2 stops
SIN8:15 pmSingapore Changi
Feb 18
SIN10:10 amSingapore Changi
26h 04m
3 stops
STL10:14 pmLambert-St Louis
$1,180
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Singapore 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 December 27, 2025.
Use the filters below to find and compare flights from St. Louis to Singapore that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Mon 2/9

7:04 am-12:25 am

2 stops27h 21m

Singapore Changi

Mon 2/16

4:45 pm-11:18 pm

2 stops44h 33m

$993

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Sat 1/31

6:43 pm-9:25 am

2 stops48h 42m

Singapore Changi

Wed 2/18

10:00 am-11:48 pm

2 stops27h 48m

$1,034

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Fri 1/16

11:05 am-5:40 am

2 stops28h 35m

Singapore Changi

Sat 1/31

8:40 am-6:14 pm

2 stops47h 34m

$1,107

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Tue 2/10

5:00 pm-8:00 am

1 stop25h 00m

Singapore Changi

Tue 2/17

10:10 am-4:44 pm

1 stop20h 34m

$1,125

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Fri 1/16

11:05 am-6:35 am

2 stops29h 30m

Singapore Changi

Sat 1/31

8:15 am-7:51 pm

2 stops25h 36m

$1,129

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Tue 2/10

1:15 pm-8:00 am

2 stops28h 45m

Singapore Changi

Tue 2/17

10:10 am-8:26 pm

2 stops24h 16m

$1,130

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Sat 1/31

4:49 pm-8:15 pm

2 stops37h 26m

Singapore Changi

Wed 2/18

10:10 am-10:14 pm

3 stops26h 04m

$1,180

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Fri 1/16

6:45 am-12:55 am

2 stops28h 10m

Singapore Changi

Sat 1/31

10:20 pm-5:11 am

1 stop20h 51m

$1,237

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Mon 4/20

7:05 pm-6:45 am

1 stop22h 40m

Singapore Changi

Thu 4/23

9:00 am-6:24 pm

1 stop22h 24m

$1,316

St. LouisSingapore

STL - SIN

STLSIN

Lambert-St Louis

Mon 4/20

8:54 am-6:45 am

2 stops32h 51m

Singapore Changi

Thu 4/23

8:40 pm-5:50 am

1 stop22h 10m

$1,320

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Singapore

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 day to depart on your flight to Singapore?

The cheapest day to depart from St. Louis to Singapore is on a Tuesday when prices can be found for as low as $1,370. The most expensive day to fly to Singapore is Saturday, with ticket prices averaging around $1,691.

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

In the evening is the cheapest time of day to fly from St. Louis to Singapore when you can find flight prices for as low as $1,420. Flying to Singapore in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,572 on average. Flights to Singapore from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from St. Louis to Singapore

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Singapore according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Singapore (STL to SIN) flight deals and tips

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

Fastest flight time

27h 21m

Direct flights

None
The fastest flight from St. Louis to Singapore takes 27h 21m
There are no direct flights from St. Louis to Singapore. There are no popular flight routes from St. Louis to Singapore.
Search flight deals

  • How far is Lambert-St Louis to Singapore Changi by plane?

    Singapore Changi is 9530.1 mi away from Lambert-St Louis. In terms of flight time, this usually takes a little over 27h 21m.

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

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

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

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

    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 Singapore Changi Airport.

  • What documentation or ID do you need to fly to Singapore Changi Airport?

    The travel and health documents you'll need for your trip to Singapore Changi Airport 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 Singapore Changi Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Singapore?

Best airlines flying from St. Louis to Singapore

Compare and see reviews for airlines that fly from St. Louis to Singapore with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $1,094Free CancellationRating
7.4
9,113 reviews
Search United Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Singapore for you.

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

All flight searches from St. Louis to Singapore on momondo can be filtered to show those which offer flexible booking policies.

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

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 Singapore.

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

If you are simply researching potential flights to Singapore, momondo offers a useful price alert feature which will track prices for flights to Singapore from St. Louis and alert you when they change.

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