Cheap Flights from Chiang Mai (CNX) to Samui Intl. Airport (USM)

Find the cheapest month to fly from Chiang Mai (CNX) to Koh Samui (USM)

September is typically the cheapest month to fly

From US$183 - US$419 per traveler.

Graph displaying average flight prices per month

Flights from Chiang Mai (CNX) to Samui Intl. Airport (USM)
Origin airport
Chiang Mai Intl.
Destination airport
Samui Intl. Airport
Distance
641 mi
Average flight time
1 hour 45 mins

Chiang Mai to Samui Intl. Airport Flights

The cheapest times to fly from Chiang Mai 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 Chiang Mai to Samui Intl. Airport are during the month of . You can find some of the cheapest flights from Chiang Mai to Samui Intl. Airport with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Chiang Mai 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 Chiang Mai 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 Chiang Mai to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Chiang Mai 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 Chiang Mai 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.

 

Frequently asked questions

How much does a flight from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM) cost?
Book cheap return fares starting at $480 from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Bangkok Airways flight leaving CNX on July 23 2025 and touching down at USM. The price was last updated on July 18 2025 and has not changed since.
What is the cheapest month to fly from CNX to USM?
The cheapest flights from CNX to USM are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM)?
When departing from Chiang Mai Intl. Airport (CNX), you can take a direct flight to Ko Samui Airport (USM) with Bangkok Airways.
What is the cheapest airline that flies from CNX to USM?
At the moment, the cheapest airline offering one-way flights from CNX to USM is Bangkok Airways. You can jet off on this route from $268. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from CNX on October 8 2025. Prices were last updated on July 18 2025 and have not changed since.
How many flights per day from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM)?
On average, there's only 1 nonstop flight taking off from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM) each day. If this doesn't fit your travel plans, consider flights with a layover. Simply filter your search results on Expedia to include one stop or more to discover a better alternative.
What are the most popular departure times for flights from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM)?
Flights between CNX and USM tend to be busiest at 11 AM. If you're after a quieter experience and possibly cheaper fares, choose a time outside the usual busy windows.
What day of the week has the most flights from CNX to USM?
If you fly on a Friday, you'll get the largest range of choices for flights from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM).
What is the earliest flight from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM)?
Catch the earliest flight at around 11:30AM UTC+7, heading out of Chiang Mai Intl. Airport (CNX). You'll be flying for about 1h 45m, reaching Ko Samui Airport (USM) at approximately 1:15PM UTC+7.
How long does it take to fly from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM)?
The average flight duration from CNX to USM is 1 hour and 45 minutes, covering a distance of 640 mi.
What airline has the least delays from CNX to USM?
With 100% of journeys usually arriving on time, Bangkok Airways has the best on-time performance for nonstop flights from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM). To check your flight status and get notifications about any changes, use the Expedia App.
What is the best time to fly from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM)?
Book a flight from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM) that takes off before 3 PM to reduce the risk of cancellations. Later departures are on average 22% more likely to be canceled.**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.
What airports do you fly into for Koh Samui from Chiang Mai Intl. Airport (CNX)?
Ko Samui Airport (USM) is the only airport in Koh Samui with direct flights from Chiang Mai Intl. Airport (CNX). Explore the available options and find affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM) last-minute?
Last-minute bookings from CNX to USM are generally more expensive. To lock in the cheapest rates, start searching for flights early. That being said, if you're flexible with your travel plans, it's possible to land a cheap fare right before your trip.
Is it cheaper to book a CNX to USM flight and hotel package?
Compared with arranging hotels and flights separately, booking a CNX to USM flight and hotel package with Expedia could result in significant savings. What's more, having it all in one place takes the hassle out of planning your trip. Simply secure your flights and select from our wide range of stays, then personalize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Chiang Mai Intl. Airport (CNX) to Ko Samui Airport (USM)?
If you reserved your CNX to USM flight in the last 24 hours, you may be able to cancel or modify it without any fees. 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, head to our Customer Service portal for more details.

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*Available to One Key members.