$459 Cheap Flights from Colombo (CMB) to Samui Intl. Airport (USM)

View $459 flight on Thu, Sep 3, 2026Opens in a new window

Popular airlines from Bandaranaike Intl. Airport (CMB) to Samui Intl. Airport (USM)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Colombo to Samui Intl. Airport (CMB-USM)

Prices were available within the past 7 days and start at $459 for one-way flights and $800 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

SriLankan Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$800 Roundtrip, found 3 days ago
$800
Roundtrip
found 3 days ago
Select SriLankan Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $800 found 3 days ago
SriLankan Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$811 Roundtrip, found 3 days ago
$811
Roundtrip
found 3 days ago
Select SriLankan Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $811 found 3 days ago
SriLankan Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$816 Roundtrip, found 3 days ago
$816
Roundtrip
found 3 days ago
Select SriLankan Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $816 found 3 days ago
SriLankan Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$820 Roundtrip, found 3 days ago
$820
Roundtrip
found 3 days ago
Select SriLankan Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $820 found 3 days ago
SriLankan Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$826 Roundtrip, found 3 days ago
$826
Roundtrip
found 3 days ago
Select SriLankan Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $826 found 3 days ago
SriLankan Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$830 Roundtrip, found 3 days ago
$830
Roundtrip
found 3 days ago
Select SriLankan Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $830 found 3 days ago
SriLankan Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$836 Roundtrip, found 3 days ago
$836
Roundtrip
found 3 days ago
Select SriLankan Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $836 found 3 days ago
SriLankan Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$840 Roundtrip, found 3 days ago
$840
Roundtrip
found 3 days ago
Select SriLankan Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $840 found 3 days ago
Thai Airways International
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$1,085 Roundtrip, found 3 days ago
$1,085
Roundtrip
found 3 days ago
Select Thai Airways International flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $1,085 found 3 days ago
Singapore Airlines
Fri, Mar 20 - Wed, May 20
CMB
Colombo
USM
Koh Samui
$1,182 Roundtrip, found 3 days ago
$1,182
Roundtrip
found 3 days ago
Select Singapore Airlines flight, departing Fri, Mar 20 from Colombo to Koh Samui, returning Wed, May 20, priced at $1,182 found 3 days ago

Frequently asked questions

How much does a flight from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) cost?
You can find cheap one-way flights from $459 and cheap return flights from $800 Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) with Expedia. One-way flights typically cost between $511 and $1268, and return flights often range between $1534 and $2585. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
The cheapest month to fly from CMB to USM is March when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
Enter CMB to USM and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
SriLankan Airlines is one of the cheapest airlines offering connecting flights from Colombo (CMB) to Samui Intl. Airport (USM), with round-trip tickets starting from around $1,364. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
To find a cheap flight from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from CMB to USM. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
The most popular departure times for flights from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) are in the early morning, from midnight to 3am. About 79% of passengers prefer this time window. Many major carriers, including Thai Airways, Bangkok Airways, and Singapore Airlines, offer flights during this window. This timing works well because it allows you to arrive in Samui early in the day, ready to enjoy the beach.
How long does it take to fly from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
Flights from CMB to USM with one stop typically take around 8 hours, covering approximately 1,389 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
Business class seats are offered on the CMB to USM route with Cathay Pacific.
How do I earn miles on a Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) flight with Expedia?
It's easy to earn miles on a Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
Is it cheaper to buy a plane ticket from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) at the last minute?
Typically, booking a last minute flight from Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) flight and hotel package?
Securing a Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) Koh Samui Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays 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 Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM)?
If you booked your Colombo (CMB-Bandaranaike Intl.) to Samui Intl. Airport (USM) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Bandaranaike Intl.
Destination airport
Samui Intl. Airport
Roundtrip price
$800
Distance
1388 mi

Book with confidence

Colombo to Samui Intl. Airport Flights

The cheapest times to fly from Colombo to Samui Intl. Airport

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 Colombo to Samui Intl. Airport are during the month of March. You can find some of the cheapest flights from Colombo to Samui Intl. Airport with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Colombo to Samui Intl. Airport

Sunday is one of the best days to book for cheap flights from Colombo to Samui Intl. Airport: 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 Colombo to Samui Intl. Airport

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 Colombo to Samui Intl. Airport in 2026. You can also book with separate airlines for your outbound and return journeys, from $459 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 Colombo to Samui Intl. Airport 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 Colombo to Samui Intl. Airport 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.

 

Colombo to Samui Intl. Airport Flights

*Flight schedules are subject to change.

*Available to One Key members.