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

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
Alaska Airlines
Cathay Pacific
United
Delta
Japan Airlines
Hawaiian Airlines
All Nippon Airways
Air Canada
Qatar Airways

Alternative airports near Singapore

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

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.
*Available to One Key members.