Cheap flights from London to Koh Samui from $1,206 LCY, LGW, LHR, LTN, STN → USM
London City Airport (LCY), London Gatwick Airport (LGW), London Heathrow Airport (LHR), London Luton Airport (LTN), Stansted Airport (STN) → Koh Samui Airport (USM)
The cheapest return found recently is $1,206 with Norwegian Air Shuttle, 25 Mar 2027 – 12 Apr 2027, found yesterday.
- Cheapest return found recently
- $1,206, 25 Mar 2027 to 12 Apr 2027
- Usual return price
- $1,237 to $1,572
- Cheapest month to fly
- March 2027, return fares from $1,206 found in the last 7 days
Return
The cheapest return fare on each of 3 departure dates is usually $1,237 to $1,572.
Cheapest return found recently
$1,206
25 Mar 2027 – 12 Apr 2027 · Norwegian Air Shuttle
London Gatwick Airport (LGW) → Koh Samui Airport (USM)
Leaves 8:55 p.m. · Return leaves 7:45 p.m. · 91 h of travel, both ways together
out 3 stops, back 3 stops
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$1,206 25 Mar 2027 – 12 Apr 2027found yesterdaySee 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 $818 to $1,522.
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 8 Dec to 25 Mar 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 18-night return fares leaving within 3 days of 25 Mar 2027 to compare.
Every date we hold
41 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 8 Dec – 2 Jan 2027 | $1,877 | Ajet | Stansted Airport (STN) → Koh Samui Airport (USM) | out 3 stops, back 3 stops | found 5 days ago | See prices for these dates |
| 24 Mar 2027 – 12 Apr 2027 | $1,267 | Turkmenistan Airlines | London Gatwick Airport (LGW) → Koh Samui Airport (USM) | out 3 stops, back 2 stops | found 4 days ago | See prices for these dates |
| 25 Mar 2027 – 12 Apr 2027 | $1,206 | Norwegian Air Shuttle | London Gatwick Airport (LGW) → Koh Samui Airport (USM) | out 3 stops, back 3 stops | found yesterday | See prices for these dates |
Which month looks cheapest?
March 2027 is the cheapest month — from $1,206.
Airlines on the cheapest dates: Ajet, Turkmenistan Airlines, Norwegian Air Shuttle.
Premium cabin fares from London 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 25 Mar 2027 – 12 Apr 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for London to Koh Samui?
Return
The cheapest fares were 0 to 6 days before departure.
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 | $818 | $818 | Cheapest seen | 7 |
| 30–59 days | $1,182 | $851 | +45% | 27 |
| 60–89 days | $1,354 | $1,226 | +66% | 9 |
| 90–179 days | $1,050 | $822 | +28% | 46 |
| 180+ days | $1,236 | $1,036 | +51% | 21 |
Live price for these dates
The cheapest return found recently is for 25 Mar 2027 – 12 Apr 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 London to Koh Samui?
The cheapest return found recently is $1,206 with Norwegian Air Shuttle, 25 Mar 2027 to 12 Apr 2027, found yesterday. The cheapest return fare on each of 3 departure dates is usually $1,237 to $1,572.
What is the cheapest month to fly from London to Koh Samui?
March 2027 is the cheapest month for a return, from $1,206, 25 Mar 2027 to 12 Apr 2027, found yesterday.
How far ahead should I book a flight from London to Koh Samui?
In 50 days of prices between 24 Sept and 12 Nov, return fares were cheapest 0 to 6 days before departure.
Which airlines have the cheapest flights from London to Koh Samui?
Between 8 Dec and 25 Mar 2027, Ajet has the cheapest return on 1 of the 3 departure dates we hold, Turkmenistan Airlines on 1 and Norwegian Air Shuttle on 1.
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