$522 Cheap Flights from Singapore (SIN) to St. Louis (STL)

View $522 flight on Sun, Oct 26, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $522 for one-way flights and $888 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Oct 21 - Wed, Oct 29
SIN
Singapore
STL
St. Louis
$888 Roundtrip, found 5 days ago
$888
Roundtrip
found 5 days ago
Select Air Canada flight, departing Tue, Oct 21 from Singapore to St. Louis, returning Wed, Oct 29, priced at $888 found 5 days ago
Air Canada
Tue, Oct 21 - Tue, Oct 28
SIN
Singapore
STL
St. Louis
$909 Roundtrip, found 5 days ago
$909
Roundtrip
found 5 days ago
Select Air Canada flight, departing Tue, Oct 21 from Singapore to St. Louis, returning Tue, Oct 28, priced at $909 found 5 days ago
Air Canada
Sat, Oct 18 - Wed, Oct 29
SIN
Singapore
STL
St. Louis
$920 Roundtrip, found 5 days ago
$920
Roundtrip
found 5 days ago
Select Air Canada flight, departing Sat, Oct 18 from Singapore to St. Louis, returning Wed, Oct 29, priced at $920 found 5 days ago
Air Canada
Tue, Oct 21 - Sun, Oct 26
SIN
Singapore
STL
St. Louis
$928 Roundtrip, found 5 days ago
$928
Roundtrip
found 5 days ago
Select Air Canada flight, departing Tue, Oct 21 from Singapore to St. Louis, returning Sun, Oct 26, priced at $928 found 5 days ago
Air Canada
Sat, Oct 18 - Tue, Oct 28
SIN
Singapore
STL
St. Louis
$940 Roundtrip, found 5 days ago
$940
Roundtrip
found 5 days ago
Select Air Canada flight, departing Sat, Oct 18 from Singapore to St. Louis, returning Tue, Oct 28, priced at $940 found 5 days ago
Air Canada
Sat, Oct 18 - Sun, Oct 26
SIN
Singapore
STL
St. Louis
$959 Roundtrip, found 5 days ago
$959
Roundtrip
found 5 days ago
Select Air Canada flight, departing Sat, Oct 18 from Singapore to St. Louis, returning Sun, Oct 26, priced at $959 found 5 days ago
Cathay Pacific
Tue, Sep 23 - Tue, Sep 30
SIN
Singapore
STL
St. Louis
$1,202 Roundtrip, found 2 days ago
$1,202
Roundtrip
found 2 days ago
Select Cathay Pacific flight, departing Tue, Sep 23 from Singapore to St. Louis, returning Tue, Sep 30, priced at $1,202 found 2 days ago
Japan Airlines
Tue, Sep 9 - Tue, Sep 16
SIN
Singapore
STL
St. Louis
$1,341 Roundtrip, found 16 hours ago
$1,341
Roundtrip
found 16 hours ago
Select Japan Airlines flight, departing Tue, Sep 9 from Singapore to St. Louis, returning Tue, Sep 16, priced at $1,341 found 16 hours ago
Lufthansa
Tue, Sep 9 - Tue, Sep 16
SIN
Singapore
STL
St. Louis
$1,392 Roundtrip, found 16 hours ago
$1,392
Roundtrip
found 16 hours ago
Select Lufthansa flight, departing Tue, Sep 9 from Singapore to St. Louis, returning Tue, Sep 16, priced at $1,392 found 16 hours ago
American Airlines
Mon, Oct 20 - Wed, Oct 22
SIN
Singapore
STL
St. Louis
$1,417 Roundtrip, found 3 days ago
$1,417
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon, Oct 20 from Singapore to St. Louis, returning Wed, Oct 22, priced at $1,417 found 3 days ago
Flights from Singapore (SIN) to St. Louis (STL)
Origin airport
Changi
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Air Canada, All Nippon Airways, American Airlines, British Airways, Cathay Pacific, Delta, Japan Airlines, KLM, Korean Air, Lufthansa, Qantas Airways, Qatar Airways, United
Roundtrip price
$887
Distance
9519 mi

Singapore to St. Louis Flights

The cheapest times to fly from Singapore to St. Louis

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 Singapore to St. Louis are during the month of October. You can find some of the cheapest flights from Singapore to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Singapore to St. Louis: 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 Singapore to St. Louis

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 Singapore to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $522 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 Singapore to St. Louis 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 Singapore to St. Louis 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 Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL) cost?
Snag a cheap one-way flight from $522 or cheap return flight from $888 from Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL)?
October is the least expensive month to fly from SIN to STL. Avoiding peak travel times is often the key to landing a great deal.
What is the cheapest airline that flies from Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest SIN to STL flight.
How many flights per day from Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL)?
There are no daily direct flights from Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL). But you can opt for flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be cruising above the clouds in no time at all.
What day of the week has the most flights from SIN to STL?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can change depending on a range of factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL) route, aim to travel before 3 PM. Departures after this time have a 22% higher chance of being canceled.**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 Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute bookings from SIN to STL are typically more expensive. For the lowest rates, start looking for flights as soon as possible. That said, if you're flexible with your travel plans, you may land a cheap ticket right before you leave.
Is it cheaper to book a SIN to STL flight and hotel package?
Securing a SIN to STL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Choose from our impressive range of hotels and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Changi Airport (SIN) to Lambert-St. Louis Intl. Airport (STL)?
Typically, it's possible to cancel or reschedule your SIN to STL flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.