$585 Cheap Flights from Singapore (SIN) to St. Louis (STL)

View $585 flight on Tue, Nov 18, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $585 for one-way flights and $909 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Jan 27 - Tue, Feb 24
SIN
Singapore
STL
St. Louis
$909 Roundtrip, found 3 days ago
$909
Roundtrip
found 3 days ago
Select Air Canada flight, departing Tue, Jan 27 from Singapore to St. Louis, returning Tue, Feb 24, priced at $909 found 3 days ago
Air Canada
Tue, Jan 27 - Tue, Feb 24
SIN
Singapore
STL
St. Louis
$930 Roundtrip, found 3 days ago
$930
Roundtrip
found 3 days ago
Select Air Canada flight, departing Tue, Jan 27 from Singapore to St. Louis, returning Tue, Feb 24, priced at $930 found 3 days ago
Air Canada
Tue, Jan 27 - Tue, Feb 24
SIN
Singapore
STL
St. Louis
$994 Roundtrip, found 3 days ago
$994
Roundtrip
found 3 days ago
Select Air Canada flight, departing Tue, Jan 27 from Singapore to St. Louis, returning Tue, Feb 24, priced at $994 found 3 days ago
Asiana Airlines
Sun, Oct 26 - Tue, Oct 28
SIN
Singapore
STL
St. Louis
$1,000 Roundtrip, found 17 hours ago
$1,000
Roundtrip
found 17 hours ago
Select Asiana Airlines flight, departing Sun, Oct 26 from Singapore to St. Louis, returning Tue, Oct 28, priced at $1,000 found 17 hours ago
Air Canada
Tue, Jan 27 - Tue, Feb 24
SIN
Singapore
STL
St. Louis
$1,029 Roundtrip, found 3 days ago
$1,029
Roundtrip
found 3 days ago
Select Air Canada flight, departing Tue, Jan 27 from Singapore to St. Louis, returning Tue, Feb 24, priced at $1,029 found 3 days ago
Air Canada
Tue, Jan 27 - Tue, Feb 24
SIN
Singapore
STL
St. Louis
$1,043 Roundtrip, found 3 days ago
$1,043
Roundtrip
found 3 days ago
Select Air Canada flight, departing Tue, Jan 27 from Singapore to St. Louis, returning Tue, Feb 24, priced at $1,043 found 3 days ago
Cathay Pacific
Mon, Dec 8 - Wed, Jan 7
SIN
Singapore
STL
St. Louis
$1,201 Roundtrip, found 10 hours ago
$1,201
Roundtrip
found 10 hours ago
Select Cathay Pacific flight, departing Mon, Dec 8 from Singapore to St. Louis, returning Wed, Jan 7, priced at $1,201 found 10 hours ago
Japan Airlines
Mon, Feb 2 - Mon, Feb 9
SIN
Singapore
STL
St. Louis
$1,328 Roundtrip, found 4 hours ago
$1,328
Roundtrip
found 4 hours ago
Select Japan Airlines flight, departing Mon, Feb 2 from Singapore to St. Louis, returning Mon, Feb 9, priced at $1,328 found 4 hours ago
Lufthansa
Mon, Feb 2 - Mon, Feb 9
SIN
Singapore
STL
St. Louis
$1,384 Roundtrip, found 4 hours ago
$1,384
Roundtrip
found 4 hours ago
Select Lufthansa flight, departing Mon, Feb 2 from Singapore to St. Louis, returning Mon, Feb 9, priced at $1,384 found 4 hours ago
American Airlines
Mon, Feb 2 - Mon, Feb 9
SIN
Singapore
STL
St. Louis
$1,403 Roundtrip, found 4 hours ago
$1,403
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Mon, Feb 2 from Singapore to St. Louis, returning Mon, Feb 9, priced at $1,403 found 4 hours ago

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 $585 or cheap return flight from $909 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)?
January 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.

Travel information

Origin airport
Changi
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Air Canada, Air France, All Nippon Airways, American Airlines, British Airways, Cathay Pacific, Delta, Finnair, Hawaiian Airlines, Japan Airlines, KLM, Korean Air, Lufthansa, Qantas Airways, Qatar Airways, United
Roundtrip price
$908
Distance
9519 mi

Book with confidence

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 January. 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 $585 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.

 

Singapore to St. Louis Flights

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*Available to One Key members.