$677 Cheap Flights from Kathmandu (KTM) to Sihanoukville (KOS)

View $677 flight on Mon, Oct 13, 2025Opens in a new window

Popular airlines from Tribhuvan Intl. Airport (KTM) to Sihanoukville (KOS)

Cheap Flights from Kathmandu to Sihanoukville (KTM-KOS)

Prices were available within the past 7 days and start at $677 for one-way flights and $1,289 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air India
Tue, Oct 7 - Tue, Oct 21
KTM
Kathmandu
KOS
Sihanoukville
$1,289 Roundtrip, found 4 days ago
$1,289
Roundtrip
found 4 days ago
Select Air India flight, departing Tue, Oct 7 from Kathmandu to Sihanoukville, returning Tue, Oct 21, priced at $1,289 found 4 days ago
Air India
Tue, Oct 7 - Tue, Oct 14
KTM
Kathmandu
KOS
Sihanoukville
$1,715 Roundtrip, found 4 days ago
$1,715
Roundtrip
found 4 days ago
Select Air India flight, departing Tue, Oct 7 from Kathmandu to Sihanoukville, returning Tue, Oct 14, priced at $1,715 found 4 days ago
Air India
Tue, Oct 7 - Sat, Oct 18
KTM
Kathmandu
KOS
Sihanoukville
$1,787 Roundtrip, found 4 days ago
$1,787
Roundtrip
found 4 days ago
Select Air India flight, departing Tue, Oct 7 from Kathmandu to Sihanoukville, returning Sat, Oct 18, priced at $1,787 found 4 days ago
China Southern Airlines
Wed, Oct 8 - Mon, Oct 20
KTM
Kathmandu
KOS
Sihanoukville
$1,841 Roundtrip, found 4 days ago
$1,841
Roundtrip
found 4 days ago
Select China Southern Airlines flight, departing Wed, Oct 8 from Kathmandu to Sihanoukville, returning Mon, Oct 20, priced at $1,841 found 4 days ago
China Southern Airlines
Wed, Oct 8 - Sun, Oct 26
KTM
Kathmandu
KOS
Sihanoukville
$1,859 Roundtrip, found 4 days ago
$1,859
Roundtrip
found 4 days ago
Select China Southern Airlines flight, departing Wed, Oct 8 from Kathmandu to Sihanoukville, returning Sun, Oct 26, priced at $1,859 found 4 days ago
China Southern Airlines
Wed, Oct 8 - Fri, Oct 10
KTM
Kathmandu
KOS
Sihanoukville
$1,876 Roundtrip, found 4 days ago
$1,876
Roundtrip
found 4 days ago
Select China Southern Airlines flight, departing Wed, Oct 8 from Kathmandu to Sihanoukville, returning Fri, Oct 10, priced at $1,876 found 4 days ago
Emirates
Tue, Oct 7 - Thu, Oct 23
KTM
Kathmandu
KOS
Sihanoukville
$2,312 Roundtrip, found 4 days ago
$2,312
Roundtrip
found 4 days ago
Select Emirates flight, departing Tue, Oct 7 from Kathmandu to Sihanoukville, returning Thu, Oct 23, priced at $2,312 found 4 days ago
Emirates
Tue, Oct 7 - Thu, Oct 16
KTM
Kathmandu
KOS
Sihanoukville
$2,366 Roundtrip, found 4 days ago
$2,366
Roundtrip
found 4 days ago
Select Emirates flight, departing Tue, Oct 7 from Kathmandu to Sihanoukville, returning Thu, Oct 16, priced at $2,366 found 4 days ago
Emirates
Thu, Oct 9 - Sat, Oct 11
KTM
Kathmandu
KOS
Sihanoukville
$2,530 Roundtrip, found 4 days ago
$2,530
Roundtrip
found 4 days ago
Select Emirates flight, departing Thu, Oct 9 from Kathmandu to Sihanoukville, returning Sat, Oct 11, priced at $2,530 found 4 days ago
Flights from Kathmandu (KTM) to Sihanoukville (KOS)
Origin airport
Tribhuvan Intl.
Destination airport
Sihanoukville
Roundtrip price
$1,289
Distance
1675 mi

Kathmandu to Sihanoukville Flights

The cheapest times to fly from Kathmandu to Sihanoukville

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

 

The best time to book a flight from Kathmandu to Sihanoukville

Sunday is one of the best days to book for cheap flights from Kathmandu to Sihanoukville: 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 Kathmandu to Sihanoukville

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 Kathmandu to Sihanoukville in 2025. You can also book with separate airlines for your outbound and return journeys, from $677 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 Kathmandu to Sihanoukville 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 Kathmandu to Sihanoukville 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 Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS) cost?
Secure a cheap one-way flight from $677 or cheap return flight from $1,289 from Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS)?
Planning your trip for October may help you find better deals, as it's the cheapest month for flights between KTM and KOS. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll take you from KTM to KOS. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS)?
There are no daily nonstop flights departing from Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS). But you can book flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be soaring above the clouds in no time at all.
What day of the week has the most flights from KTM to KOS?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS)?
To reach Sihanoukville Airport (KOS) on time, choose a flight that leaves from Tribhuvan Intl. Airport (KTM) 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 Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS) last-minute?
Last-minute bookings from KTM to KOS are usually more expensive. To lock in the cheapest rates, start looking for flights as early as possible. That being said, if you're flexible with your travel plans, it's possible to score a cheap ticket right before you leave.
Is it cheaper to book a KTM to KOS flight and hotel package?
Securing a KTM to KOS flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Select from our impressive range of stays and then add flights, car rentals and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Tribhuvan Intl. Airport (KTM) to Sihanoukville Airport (KOS)?
In most cases, you're able to reschedule or cancel your KTM to KOS flight. However, additional fees may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's rules and fees on flight changes, or if you want further information, head to our Customer Service portal.

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*Available to One Key members.