How the cheapest fare moved
Aug 9: €114 €114
Aug 3
Aug 9
low €106 · high €139
Departure-day prices · September 2025 Chiang Mai → Koh Samui
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Return-day prices · September 2025 Koh Samui → Chiang Mai
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Best time to visit Koh Samui — climate Jan: ~28°C daytime, 16 rainy days
28°
Jan Feb: ~29°C daytime, 15 rainy days
29°
Feb Mar: ~30°C daytime, 15 rainy days
30°
Mar Apr: ~31°C daytime, 18 rainy days
31°
Apr May: ~30°C daytime, 25 rainy days
30°
May Jun: ~31°C daytime, 19 rainy days
31°
Jun Jul: ~33°C daytime, 13 rainy days
33°
Jul Aug: ~31°C daytime, 21 rainy days
31°
Aug Sep: ~31°C daytime, 20 rainy days
31°
Sep Oct: ~30°C daytime, 29 rainy days
30°
Oct Nov: ~29°C daytime, 21 rainy days
29°
Nov Dec: ~29°C daytime, 15 rainy days
29°
Dec Best value: Oct — fares from €106 and ~30°C daytime.
Flights from Chiang Mai to Koh Samui start around €106 (typically 1 stop). Range seen recently: €106–116, based on 15 fares found by travellers.
Fly (from €106)
2h 15m duration
€106–116 recent fares
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Cheapest cached fares Chiang Mai → Koh Samui; typically 1 stop (e.g. VZ). · Based on 15 fares found by travellers in the last 48h
Cheapest round trips to Koh Samui Fares found by travellers in the last 48 hours — refreshed daily.
Dec 11 – Dec 18
Thai AirAsia · 1 stop · 2h 25m
€252
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Sep 9 – Sep 16
Thai Vietjet Air · 1 stop · 2h 30m
€262
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Jan 31 – Feb 13
Thai AirAsia · 1 stop · 2h 25m
€268
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Mar 2 – Mar 2
Thai Vietjet Air · 1 stop · 2h 30m
€318
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Aug 11 – Aug 18
Thai AirAsia · 1 stop · 2h 40m
€341
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Aug 10 – Aug 20
Thai Lion Air · 1 stop · 2h 45m
€429
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Aug 11 – Aug 13
Thai AirAsia · 1 stop · 2h 40m
€445
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Weather in Koh Samui
Sun
🌦️
32°
27°
💧33%
Mon
🌧️
32°
26°
💧55%
Tue
🌦️
32°
26°
💧33%
Wed
🌦️
31°
27°
💧25%
Thu
🌧️
31°
26°
💧59%
Fri
⛈️
31°
25°
💧72%
Sat
🌦️
30°
25°
💧84%
In Sep, Koh Samui typically sees ~30°C daytime highs and 21 rainy days.
Where to stay in Koh Samui 3★+ hotels from €33/night (39 hotels sampled, ~3 weeks out).
Crystal Lamai Hotel
hotel · Koh Samui
from €33/night ★ 3
COSI Samui Chaweng Beach
hotel · Koh Samui
from €49/night ★ 3
The Briza Beach Resort, Samui
hotel · Koh Samui
from €76/night ★ 4
Good to know Time difference Same time zone
Time in the air 2h 25m
Things to do in Koh Samui Top-rated tours and tickets from €47 — book ahead for the popular ones.
Tours and tickets provided by Viator (a Tripadvisor company). Some links earn Stayonomy a commission.
About Koh Samui
Ko Samui (เกาะสมุย), often called just Samui (สมุย) is an island of great natural beauty and variety in the Gulf of Thailand. The palm-fringed shoreline and coconut and fruit cultivation of the coastal lowlands rise to a central granite massif, the slopes of which are cloaked in virgin rainforest.
Read the full Koh Samui guide
Guide content from Wikivoyage contributors (CC BY-SA).
Popular from Chiang Mai Cheapest destinations travellers searched recently — refreshed daily.
Flight prices are real fares travellers found in the last 48 hours, refreshed daily — the booking site confirms the final price. Train, bus and ferry fares are shown on the operators' booking sites. Weather data by Open-Meteo ; exchange rates: ECB reference. Data updated 2026-08-09. Some links earn Stayonomy a commission at no cost to you.
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