Chiang Mai to Koh Samui Flights from US$129 incl. tax

Based on HopeGoo data, Thai Lion Air offers one-way fares as low as US$114 on Cheapest nonstop routes (e.g. CNX to USM on Sat, Mar 21), while Bangkok Airways offers Cheapest nonstop round-trips from US$241 departing on Sat, Mar 21 and returning on Tue, Mar 24.

At the moment, you can catch a nonstop flight from Chiang Mai to Koh Samui with the following airlines, including: Bangkok Airways Thai Lion Air Nokair Thai Vietjet Air Thai Airways Selected airlines are based on historical data collected from flight bookings users made on HopeGoo within the last 90 days.

It takes about 1 hour 45 minutes to fly from Chiang Mai to Koh Samui.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Chiang Mai to Koh Samui is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

Based on HopeGoo data in the past 4 weeks, there is 7 flight per week flying from Chiang Mai to Koh Samui. You can check the weekly schedule for popular airlines on this route below: Bangkok Airways: S/M/T/W/T/F/S -- PG242 (11:43) Thai Airways: S/M/T/W/T/F/S -- TG5594 (11:43)

To find best deals on flights from Chiang Mai to Koh Samui, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sat, Mar 21, with one-way flights priced at just US$114. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Bangkok Airways. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Koh Samui travel is around July. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Chiang Mai to Koh Samui is September, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Chiang Mai to Koh Samui on February 26, 2026 with Thai AirAsia, with prices starting at US$119.

You can land at any one of the following hubs in Koh Samui, with Chiang Mai International Airport to Samui Airport (CNX-USM) is by far the most common option on this route: Samui Airport (USM).

The time difference between Koh Samui and Chiang Mai is 0h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your HopeGoo, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.