Cheap flights from Koh Samui to Chiang Mai from $107 USM → CNX

Found recently, and the cheapest we hold

It is also the cheapest return we hold, of any age.

What have prices looked like?

Over 49 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $218 to $286.

At $287, the cheapest return found recently is above that range.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

No. We hold 5-night return fares on 2 other departure dates within 3 days of 19 Jan 2027, and none is cheaper.

Every date we hold

13 fares on 7 departure dates

Which month looks cheapest?

January 2027 is the cheapest month — from $287.

Found recently, and the cheapest we hold

What have prices looked like?

Over 49 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $81 to $131.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

Yes. Among one-way fares leaving within 3 days of 28 Nov, 30 Nov costs $96: $11 less than the cheapest found recently.

Bangkok Airways · Koh Samui Airport (USM) → Chiang Mai International Airport (CNX) · nonstop · found 5 days ago

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Every date we hold

5 fares on 5 departure dates

Which month looks cheapest?

November 2026 is the cheapest month — from $86.

Return

Fares 90 to 179 days before departure were typically 5% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 11 Nov (49 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.

One-way

Fares 180 or more days before departure were typically 12% lower than 0 to 6 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (49 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.

How much is a return flight from Koh Samui to Chiang Mai?

The cheapest return found recently is $287 with Bangkok Airways, 19 Jan 2027 to 24 Jan 2027, found 2 days ago. The cheapest return fare on each of 7 departure dates is usually $340 to $387.

How much is a one-way flight from Koh Samui to Chiang Mai?

The cheapest one-way found recently is $107 with Bangkok Airways, 28 Nov, found 2 days ago. The cheapest one-way we hold, of any age, is $86 with Bangkok Airways, 14 Nov, found 7 days ago. The cheapest one-way fare on each of 5 departure dates is usually $96 to $107.

What is the cheapest month to fly from Koh Samui to Chiang Mai?

January 2027 is the cheapest month for a return, from $287, 19 Jan 2027 to 24 Jan 2027, found 2 days ago. November 2026 is the cheapest month for a one-way, from $86, 14 Nov, found 7 days ago.

How far ahead should I book a flight from Koh Samui to Chiang Mai?

In 49 days of prices between 24 Sept and 11 Nov, return fares 90 to 179 days before departure were typically 5% lower than 0 to 6 days before departure. One-way fares 180 or more days before departure were typically 12% lower than 0 to 6 days before departure.

Is there a direct flight from Koh Samui to Chiang Mai?

Yes, the cheapest nonstop return found recently is $443 with Bangkok Airways, 19 Nov to 23 Nov, found 5 days ago. The cheapest nonstop one-way found recently is $107 with Bangkok Airways, 28 Nov, found 2 days ago.

How long is the flight from Koh Samui to Chiang Mai?

The cheapest nonstop one-way found recently, with Bangkok Airways on 28 Nov, takes 1 h 50 min from Koh Samui Airport (USM) to Chiang Mai International Airport (CNX).

Which airlines have the cheapest flights from Koh Samui to Chiang Mai?

Between 17 Nov and 20 Jan 2027, Bangkok Airways has the cheapest return on all 7 departure dates we hold. Between 14 Nov and 27 Feb 2027, Bangkok Airways has the cheapest one-way on all 5 departure dates we hold.