$421 Cheap Flights from St. Louis (STL) to Singapore (SIN)

View $421 flight on Thu, Feb 5, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Singapore Changi Airport (SIN)

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Cheap Flights from St. Louis to Singapore (STL-SIN)

Prices were available within the past 7 days and start at $421 for one-way flights and $1,000 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Feb 2 - Fri, Feb 6
STL
St. Louis
SIN
Singapore
$1,000 Roundtrip, found 6 days ago
$1,000
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Feb 2 from St. Louis to Singapore, returning Fri, Feb 6, priced at $1,000 found 6 days ago
Alaska Airlines
Mon, Mar 2 - Fri, Mar 6
STL
St. Louis
SIN
Singapore
$1,000 Roundtrip, found 2 days ago
$1,000
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Mon, Mar 2 from St. Louis to Singapore, returning Fri, Mar 6, priced at $1,000 found 2 days ago
Cathay Pacific
Wed, Nov 12 - Wed, Nov 19
STL
St. Louis
SIN
Singapore
$1,067 Roundtrip, found 4 days ago
$1,067
Roundtrip
found 4 days ago
Select Cathay Pacific flight, departing Wed, Nov 12 from St. Louis to Singapore, returning Wed, Nov 19, priced at $1,067 found 4 days ago
United
Tue, Oct 14 - Tue, Oct 21
STL
St. Louis
SIN
Singapore
$1,124 Roundtrip, found 4 days ago
$1,124
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 14 from St. Louis to Singapore, returning Tue, Oct 21, priced at $1,124 found 4 days ago
Delta
Thu, Apr 23 - Tue, May 12
STL
St. Louis
SIN
Singapore
$1,139 Roundtrip, found 2 days ago
$1,139
Roundtrip
found 2 days ago
Select Delta flight, departing Thu, Apr 23 from St. Louis to Singapore, returning Tue, May 12, priced at $1,139 found 2 days ago
Japan Airlines
Tue, Jan 20 - Wed, Jan 28
STL
St. Louis
SIN
Singapore
$1,159 Roundtrip, found 5 days ago
$1,159
Roundtrip
found 5 days ago
Select Japan Airlines flight, departing Tue, Jan 20 from St. Louis to Singapore, returning Wed, Jan 28, priced at $1,159 found 5 days ago
Hawaiian Airlines
Sun, Mar 1 - Tue, Mar 3
STL
St. Louis
SIN
Singapore
$1,164 Roundtrip, found 2 days ago
$1,164
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Sun, Mar 1 from St. Louis to Singapore, returning Tue, Mar 3, priced at $1,164 found 2 days ago
All Nippon Airways
Tue, Jan 20 - Wed, Jan 28
STL
St. Louis
SIN
Singapore
$1,176 Roundtrip, found 5 days ago
$1,176
Roundtrip
found 5 days ago
Select All Nippon Airways flight, departing Tue, Jan 20 from St. Louis to Singapore, returning Wed, Jan 28, priced at $1,176 found 5 days ago
Air Canada
Wed, Apr 1 - Sat, Apr 18
STL
St. Louis
SIN
Singapore
$1,186 Roundtrip, found 20 hours ago
$1,186
Roundtrip
found 20 hours ago
Select Air Canada flight, departing Wed, Apr 1 from St. Louis to Singapore, returning Sat, Apr 18, priced at $1,186 found 20 hours ago
Qatar Airways
Mon, Oct 27 - Mon, Nov 10
STL
St. Louis
SIN
Singapore
$1,242 Roundtrip, found 9 hours ago
$1,242
Roundtrip
found 9 hours ago
Select Qatar Airways flight, departing Mon, Oct 27 from St. Louis to Singapore, returning Mon, Nov 10, priced at $1,242 found 9 hours ago

Alternative airports near Singapore

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Changi SIN. Cheapest option available. Average driving time to city center is 18 minutes. Flights from $1,076
SIN
Changi
Cheapest
Average driving time to city center18 min
Flights from $1,076
Flights from St. Louis (STL) to Singapore (SIN)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Changi
Airlines serving
Air Canada, Air France, All Nippon Airways, American Airlines, Asiana Airlines, British Airways, Cathay Pacific, Delta, Finnair, Japan Airlines, KLM, Korean Air, Lufthansa, Qantas Airways, Qatar Airways, Turkish Airlines, United
Roundtrip price
$999
Distance
9519 mi

St. Louis to Singapore Flights

The cheapest times to fly from St. Louis to Singapore

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Singapore are during the month of February. You can find some of the cheapest flights from St. Louis to Singapore with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Singapore

Sunday is one of the best days to book for cheap flights from St. Louis to Singapore: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Singapore

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Singapore in 2025. You can also book with separate airlines for your outbound and return journeys, from $421 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Singapore flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Singapore airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN) cost?
Lock in a cheap one-way flight from $421 or cheap return flight from $1,000 from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN)?
February is the cheapest month to fly from STL to SIN. Traveling outside of peak seasons is often the key to scoring lower fares.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN)?
To find the cheapest airline flying from STL to SIN, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN)?
There are no daily direct flights from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN). But you can book flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from STL to SIN?
Usually you'll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can change based on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN)?
To reach Changi Airport (SIN) without delays, pick a flight that takes off from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN) last-minute?
Waiting until just before your trip to book your flight from STL to SIN generally means paying more. While it's possible to find some last-minute offers, they're not always guaranteed. Be flexible with your itinerary to boost your chances of scoring a bargain.
Is it cheaper to book a STL to SIN flight and hotel package?
Opting for a STL to SIN flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Select from our impressive range of hotels and then add activities, car rentals and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Changi Airport (SIN)?
Usually, it's possible to reschedule or cancel your STL to SIN flight. However, if it's been more than 24 hours since booking, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.