Chiang Mai to Koh Samui CNX → USM
Chiang Mai International Airport (CNX) → Koh Samui Airport (USM)
The cheapest return found recently is $426 with Bangkok Airways, 16 Dec – 16 Jan 2027, found yesterday. The cheapest one-way found recently is $124 with Thai Lion Air, 28 Oct, found yesterday.
Return
The cheapest return fare on each of 4 departure dates is usually $308 to $412.
Cheapest return found recently
$426
16 Dec – 16 Jan 2027 · Bangkok Airways
Chiang Mai International Airport (CNX) → Koh Samui Airport (USM)
Leaves 7:45 p.m. · Return leaves 8:50 a.m. · 13 h 50 min of travel, both ways together
out 1 stop, back nonstop
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$426 16 Dec – 16 Jan 2027found yesterdaySee prices for these dates
$273 26 Oct – 1 Novfound 5 days agoSee prices for these dates
What have prices looked like?
Over 24 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $248 to $324.
At $426, the cheapest return found recently is above that range.
24 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 4 departure dates from 25 Oct to 2 Jan 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 31-night return fares leaving within 3 days of 16 Dec to compare.
Every date we hold
4 fares on 4 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 25 Oct – 1 Nov | $320 | Thai Vietjet Air | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | out 1 stop, back nonstop | found 5 days ago | See prices for these dates |
| 26 Oct – 1 Nov | $273 | Thai AirAsia | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | out 1 stop, back nonstop | found 5 days ago | See prices for these dates |
| 16 Dec – 16 Jan 2027 | $426 | Bangkok Airways | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | out 1 stop, back nonstop | found yesterday | See prices for these dates |
| 2 Jan 2027 – 19 Jan 2027 | $407 | Thai AirAsia | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
Which month looks cheapest?
October 2026 is the cheapest month — from $273.
Airlines on the cheapest dates: Thai AirAsia, Thai Vietjet Air, Bangkok Airways.
One-way
The cheapest one-way fare on each of 5 departure dates is usually $124 to $142.
Cheapest one-way found recently
$124
28 Oct · Thai Lion Air
Chiang Mai International Airport (CNX) → Koh Samui Airport (USM)
Leaves 9:30 p.m. · 9 h 40 min trip
stops unknown
found yesterday
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$124 28 Octfound yesterdayOpen this trip
$119 21 Jul 2027found 4 days agoOpen this trip
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $119 to $145.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 5 departure dates from 20 Oct to 21 Jul 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 28 Oct to compare.
Every date we hold
5 fares on 5 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 20 Oct | $128 | Thai AirAsia | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | stops unknown | found 3 days ago | Open this trip |
| 28 Oct | $124 | Thai Lion Air | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | stops unknown | found yesterday | Open this trip |
| 8 Jan 2027 | $162 | Bangkok Airways | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | stops unknown | found 2 days ago | Open this trip |
| 1 Feb 2027 | $142 | Nok Air | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | 1 stop | found 6 days ago | Open this trip |
| 21 Jul 2027 | $119 | Thai Vietjet Air | Chiang Mai International Airport (CNX) → Koh Samui Airport (USM) | stops unknown | found 4 days ago | Open this trip |
Which month looks cheapest?
July 2027 is the cheapest month — from $119.
Airlines on the cheapest dates: Thai AirAsia, Thai Lion Air, Bangkok Airways, Nok Air, Thai Vietjet Air.
Premium cabin fares from Chiang Mai to Koh Samui
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 16 Dec – 16 Jan 2027 in another cabin: Premium economy · Business · First
Today's prices for 28 Oct in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Chiang Mai to Koh Samui?
Return
Fares 30 to 59 days before departure were typically 14% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (24 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $292 | $282 | +16% | 12 |
| 7–13 days | $273 | $273 | +8% | 7 |
| 14–29 days | $324 | $248 | +29% | 15 |
| 30–59 days | $252 | $248 | Cheapest seen | 13 |
| 60–89 days | $337 | $249 | +34% | 18 |
| 90–179 days | $299 | $256 | +19% | 19 |
| 180+ days | $320 | $320 | +27% | 8 |
One-way
Not enough history yet: in 25 days of one-way prices, 24 Sept to 18 Oct, fewer than 3 booking ranges had prices on 7 days or more.
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Chiang Mai → Surat Thani
94 km from Koh Samui
$219
$207 less than flying to Koh Samui
13 Dec – 2 Jan 2027 · CNX → URT · out 1 stop, back nonstop
found 2 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Chiang Mai → Surat Thani
94 km from Koh Samui
$60
$64 less than flying to Koh Samui
15 Feb 2027 · CNX → URT · 1 stop
found 4 days ago
Chiang Mai → Chumphon
142 km from Koh Samui
$88
$36 less than flying to Koh Samui
18 Dec · CNX → CJM · 1 stop
found yesterday
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 16 Dec – 16 Jan 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work