Cheap flights from Koh Samui to Colombo from $640 USM → CMB
Koh Samui Airport (USM) → Bandaranaike International Airport (CMB)
The cheapest return found recently is $640 with Bangkok Airways, 20 Feb 2027 – 1 Mar 2027, found today.
- Cheapest return found recently
- $640, 20 Feb 2027 to 1 Mar 2027
- Usual return price
- $640 to $665
- Cheapest month to fly
- February 2027, return fares from $640 found in the last 7 days
Return
The cheapest return fare on each of 3 departure dates is usually $640 to $665.
Cheapest return found recently
$640
20 Feb 2027 – 1 Mar 2027 · Bangkok Airways
Koh Samui Airport (USM) → Bandaranaike International Airport (CMB)
Leaves 2:05 p.m. · Return leaves 12:00 p.m. · 46 h 30 min of travel, both ways together
out 2 stops, back 2 stops
found today
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$640 20 Feb 2027 – 1 Mar 2027found todaySee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 50 days, 24 Sept to 12 Nov, the cheapest return we saw each day was $599 to $699.
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 3 departure dates from 4 Dec to 21 Feb 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 9-night return fares leaving within 3 days of 20 Feb 2027 to compare.
Every date we hold
4 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 4 Dec – 18 Dec | $689 | Bangkok Airways | Koh Samui Airport (USM) → Bandaranaike International Airport (CMB) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 20 Feb 2027 – 1 Mar 2027 | $640 | Bangkok Airways | Koh Samui Airport (USM) → Bandaranaike International Airport (CMB) | out 2 stops, back 2 stops | found today | See prices for these dates |
| 21 Feb 2027 – 1 Mar 2027 | $640 | Bangkok Airways | Koh Samui Airport (USM) → Bandaranaike International Airport (CMB) | out 2 stops, back 2 stops | found today | See prices for these dates |
Which month looks cheapest?
February 2027 is the cheapest month — from $640.
Airlines on the cheapest dates: Bangkok Airways.
Premium cabin fares from Koh Samui to Colombo
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 20 Feb 2027 – 1 Mar 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Koh Samui to Colombo?
Return
Timing didn't matter much here — prices were about the same in every range.
From the cheapest return each day between 24 Sept and 12 Nov (50 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 | $642 | $628 | Cheapest seen | 10 |
| 14–29 days | $654 | $653 | +2% | 8 |
| 30–59 days | $653 | $599 | +2% | 37 |
| 60–89 days | $664 | $632 | +4% | 31 |
| 90–179 days | $642 | $633 | +0% | 27 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
One-way
Surat Thani → Colombo
94 km from Koh Samui
$202
28 Nov · URT → CMB · 1 stop
found 3 days ago
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 20 Feb 2027 – 1 Mar 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Koh Samui to Colombo?
The cheapest return found recently is $640 with Bangkok Airways, 20 Feb 2027 to 1 Mar 2027, found today. The cheapest return fare on each of 3 departure dates is usually $640 to $665.
What is the cheapest month to fly from Koh Samui to Colombo?
February 2027 is the cheapest month for a return, from $640, 20 Feb 2027 to 1 Mar 2027, found today.
How far ahead should I book a flight from Koh Samui to Colombo?
In 50 days of prices between 24 Sept and 12 Nov, return fares cost about the same whether the flight was days or months away.
Which airlines have the cheapest flights from Koh Samui to Colombo?
Between 4 Dec and 21 Feb 2027, Bangkok Airways has the cheapest return on all 3 departure dates we hold.
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