$246 Cheap Flights from Sihanoukville (KOS) to Singapore (SIN)

View $246 flight on Mon, Jan 26, 2026Opens in a new window

Popular airlines from Sihanoukville (KOS) to Singapore Changi Airport (SIN)

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Cheap Flights from Sihanoukville to Singapore (KOS-SIN)

Prices were available within the past 7 days and start at $246 for one-way flights and $506 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Cambodia
Wed, Dec 10 - Wed, Dec 17
KOS
Sihanoukville
SIN
Singapore
$506 Roundtrip, found 4 hours ago
$506
Roundtrip
found 4 hours ago
Select Air Cambodia flight, departing Wed, Dec 10 from Sihanoukville to Singapore, returning Wed, Dec 17, priced at $506 found 4 hours ago
Air Cambodia
Wed, Dec 10 - Wed, Dec 17
KOS
Sihanoukville
SIN
Singapore
$514 Roundtrip, found 4 hours ago
$514
Roundtrip
found 4 hours ago
Select Air Cambodia flight, departing Wed, Dec 10 from Sihanoukville to Singapore, returning Wed, Dec 17, priced at $514 found 4 hours ago
Air Cambodia
Tue, Nov 25 - Thu, Nov 27
KOS
Sihanoukville
SIN
Singapore
$536 Roundtrip, found 2 days ago
$536
Roundtrip
found 2 days ago
Select Air Cambodia flight, departing Tue, Nov 25 from Sihanoukville to Singapore, returning Thu, Nov 27, priced at $536 found 2 days ago

Frequently asked questions

How much does a flight from Sihanoukville Airport (KOS) to Changi Airport (SIN) cost?
Snag a cheap one-way flight from $246 or cheap return flight from $506 from Sihanoukville Airport (KOS) to Changi Airport (SIN) 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 Sihanoukville Airport (KOS) to Changi Airport (SIN)?
December is the least expensive month to fly from KOS to SIN. Traveling during quieter months is often the key to finding better deals on flights.
What is the cheapest airline that flies from Sihanoukville Airport (KOS) to Changi Airport (SIN)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest KOS to SIN flight.
How many flights per day from Sihanoukville Airport (KOS) to Changi Airport (SIN)?
Nonstop flights from Sihanoukville Airport (KOS) to Changi Airport (SIN) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from KOS to SIN?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sihanoukville Airport (KOS) to Changi Airport (SIN)?
To reach Changi Airport (SIN) without delays, choose a flight that leaves from Sihanoukville Airport (KOS) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Sihanoukville Airport (KOS) to Changi Airport (SIN) last-minute?
Holding off until right before your break to book your flight from KOS to SIN generally means paying more. While you may find some last-minute offers, they aren't always guaranteed. Be flexible with your travel plans to boost your chances of scoring a bargain.
Is it cheaper to book a KOS to SIN flight and hotel package?
Compared with arranging hotels and flights separately, booking a KOS to SIN flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one place will take the stress out of travel planning. Just pick your flights and select from our wide range of hotels, then personalize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Sihanoukville Airport (KOS) to Changi Airport (SIN)?
If you booked your KOS to SIN flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of fare you have, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more information.

Travel information

Origin airport
Sihanoukville
Destination airport
Changi
Roundtrip price
$505
Distance
637 mi

Book with confidence

Sihanoukville to Singapore Flights

The cheapest times to fly from Sihanoukville 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 Sihanoukville to Singapore are during the month of December. You can find some of the cheapest flights from Sihanoukville to Singapore with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Sihanoukville to Singapore

Sunday is one of the best days to book for cheap flights from Sihanoukville 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 Sihanoukville 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 Sihanoukville to Singapore in 2025. You can also book with separate airlines for your outbound and return journeys, from $246 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 Sihanoukville 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 Sihanoukville 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.

 

Sihanoukville to Singapore Flights

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*Available to One Key members.