$760 Cheap Flights from Boston (BOS) to Sihanoukville (KOS)

View $760 flight on Mon, May 4, 2026Opens in a new window

Popular airlines from Logan International Airport (BOS) to Sihanoukville (KOS)

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Cheap Flights from Boston to Sihanoukville (BOS-KOS)

Prices were available within the past 7 days and start at $760 for one-way flights and $1,295 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Qatar Airways
Mon, Nov 10 - Tue, Nov 18
BOS
Boston
KOS
Sihanoukville
$1,295 Roundtrip, found 3 days ago
$1,295
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Mon, Nov 10 from Boston to Sihanoukville, returning Tue, Nov 18, priced at $1,295 found 3 days ago
Qatar Airways
Mon, Nov 10 - Thu, Nov 20
BOS
Boston
KOS
Sihanoukville
$1,298 Roundtrip, found 3 days ago
$1,298
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Mon, Nov 10 from Boston to Sihanoukville, returning Thu, Nov 20, priced at $1,298 found 3 days ago
Qatar Airways
Sat, Nov 8 - Tue, Nov 18
BOS
Boston
KOS
Sihanoukville
$1,335 Roundtrip, found 3 days ago
$1,335
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Sat, Nov 8 from Boston to Sihanoukville, returning Tue, Nov 18, priced at $1,335 found 3 days ago
Qatar Airways
Sat, Nov 8 - Thu, Nov 20
BOS
Boston
KOS
Sihanoukville
$1,338 Roundtrip, found 3 days ago
$1,338
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Sat, Nov 8 from Boston to Sihanoukville, returning Thu, Nov 20, priced at $1,338 found 3 days ago
Qatar Airways
Thu, Nov 6 - Mon, Nov 17
BOS
Boston
KOS
Sihanoukville
$1,347 Roundtrip, found 3 days ago
$1,347
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Thu, Nov 6 from Boston to Sihanoukville, returning Mon, Nov 17, priced at $1,347 found 3 days ago
Qatar Airways
Sun, Oct 26 - Fri, Oct 31
BOS
Boston
KOS
Sihanoukville
$1,350 Roundtrip, found 3 days ago
$1,350
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Sun, Oct 26 from Boston to Sihanoukville, returning Fri, Oct 31, priced at $1,350 found 3 days ago
Qatar Airways
Sat, Nov 8 - Sun, Nov 23
BOS
Boston
KOS
Sihanoukville
$1,375 Roundtrip, found 3 days ago
$1,375
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Sat, Nov 8 from Boston to Sihanoukville, returning Sun, Nov 23, priced at $1,375 found 3 days ago
Qatar Airways
Sat, Nov 8 - Sat, Nov 22
BOS
Boston
KOS
Sihanoukville
$1,378 Roundtrip, found 3 days ago
$1,378
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Sat, Nov 8 from Boston to Sihanoukville, returning Sat, Nov 22, priced at $1,378 found 3 days ago
Qatar Airways
Mon, Jan 5 - Tue, Jan 20
BOS
Boston
KOS
Sihanoukville
$1,382 Roundtrip, found 3 days ago
$1,382
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Mon, Jan 5 from Boston to Sihanoukville, returning Tue, Jan 20, priced at $1,382 found 3 days ago
Qatar Airways
Thu, Nov 6 - Sun, Nov 16
BOS
Boston
KOS
Sihanoukville
$1,387 Roundtrip, found 3 days ago
$1,387
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Thu, Nov 6 from Boston to Sihanoukville, returning Sun, Nov 16, priced at $1,387 found 3 days ago

Alternative airports near Sihanoukville

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

Select flight to Sihanoukville KOS. Cheapest and Closest option available. Average driving time to city center is 17 minutes. Flights from $1,335
KOS
Sihanoukville
CheapestClosest
Average driving time to city center17 min
Flights from $1,335

Frequently asked questions

How much does a flight from Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS) cost?
Snag a cheap one-way flight from $760 or cheap return flight from $1,295 from Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS) 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 Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS)?
The cheapest month to fly from BOS to KOS is November, when demand is low. Off-peak months are typically when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS)?
To find the cheapest airline flying from BOS to KOS, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS)?
You'll have to book a flight with a layover when traveling from Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS). There are no daily direct flights on this route. However, simply filter your search to include one or more stops to find the best option for your trip.
What day of the week has the most flights from BOS to KOS?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary based on various factors, such as the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS)?
To avoid potential delays on the Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS) route, aim to fly before 3 PM. Flights after this time have a 22% higher chance of cancellation.**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 Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS) last-minute?
Last-minute fares from BOS to KOS are generally more expensive. For the best rates, start looking for flights well ahead of time. 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 BOS to KOS flight and hotel package?
Compared with arranging hotels and flights separately, booking a BOS to KOS flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one convenient place will take the hassle out of travel planning. Just pick your flights and choose from our extensive range of hotels, then customize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Logan Intl. Airport (BOS) to Sihanoukville Airport (KOS)?
In most instances, you can reschedule or cancel your BOS to KOS flight. However, additional fees may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's guidelines and fees on flight changes, or if you want further information, go to our Customer Service portal.

Travel information

Travel information

Origin airport
Logan Intl.
Destination airport
Sihanoukville
Roundtrip price
$1,295
Distance
8762 mi

Book with confidence

Book with confidence

Boston to Sihanoukville Flights

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

 

The best time to book a flight from Boston to Sihanoukville

Sunday is one of the best days to book for cheap flights from Boston 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 Boston 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 Boston to Sihanoukville in 2025. You can also book with separate airlines for your outbound and return journeys, from $760 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 Boston 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 Boston 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.

 

Boston to Sihanoukville Flights

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*Available to One Key members.