Seoul to Koh Samui GMP, ICN → USM
Gimpo International Airport (GMP), Incheon International Airport (ICN) → Koh Samui Airport (USM)
The cheapest return found recently is $493 with Thai Vietjet Air, 20 Jul 2027 – 3 Aug 2027, found today. The cheapest one-way found recently is $223 with Thai Vietjet Air, 3 Aug 2027, found today.
Return
The cheapest return fare on each of 8 departure dates is usually $507 to $711.
Cheapest return found recently
$493
20 Jul 2027 – 3 Aug 2027 · Thai Vietjet Air
Incheon International Airport (ICN) → Koh Samui Airport (USM)
Leaves 10:10 a.m. · Return leaves 7:50 a.m. · 46 h 10 min of travel, both ways together
out 1 stop, back 1 stop
found today
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$493 20 Jul 2027 – 3 Aug 2027found todaySee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 23 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $484 to $698.
23 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 8 departure dates from 23 Dec to 23 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?
No. We hold 14-night return fares on 2 other departure dates within 3 days of 20 Jul 2027, and none is cheaper.
Every date we hold
12 fares on 8 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 23 Dec – 12 Jan 2027 | $618 | China Eastern | Incheon International Airport (ICN) → Koh Samui Airport (USM) | out 2 stops, back 1 stop | found yesterday | See prices for these dates |
| 24 Dec – 13 Jan 2027 | $749 | China Eastern | Incheon International Airport (ICN) → Koh Samui Airport (USM) | out 2 stops, back 2 stops | found yesterday | See prices for these dates |
| 26 Jan 2027 – 9 Feb 2027 | $698 | Shandong Airlines | Incheon International Airport (ICN) → Koh Samui Airport (USM) | out 2 stops, back 2 stops | found 5 days ago | See prices for these dates |
| 1 Mar 2027 – 9 Mar 2027 | $4,788 | All Nippon Airways | Gimpo International Airport (GMP) → Koh Samui Airport (USM) | out 2 stops, back 2 stops | found 4 days ago | See prices for these dates |
| 20 Jul 2027 – 3 Aug 2027 | $493 | Thai Vietjet Air | Incheon International Airport (ICN) → Koh Samui Airport (USM) | out 1 stop, back 1 stop | found today | See prices for these dates |
| 21 Jul 2027 – 4 Aug 2027 | $523 | Scoot | Incheon International Airport (ICN) → Koh Samui Airport (USM) | out 1 stop, back 1 stop | found today | See prices for these dates |
| 22 Jul 2027 – 3 Aug 2027 | $493 | Thai Vietjet Air | Incheon International Airport (ICN) → Koh Samui Airport (USM) | out 1 stop, back 1 stop | found today | See prices for these dates |
| 23 Jul 2027 – 7 Aug 2027 | $511 | Thai Vietjet Air | Incheon International Airport (ICN) → Koh Samui Airport (USM) | out 1 stop, back 1 stop | found today | See prices for these dates |
Which month looks cheapest?
July 2027 is the cheapest month — from $493.
Airlines on the cheapest dates: Thai Vietjet Air, China Eastern, Shandong Airlines, All Nippon Airways, Scoot.
One-way
Not enough comparable prices yet for a usual one-way price.
Cheapest one-way found recently
$223
3 Aug 2027 · Thai Vietjet Air
Incheon International Airport (ICN) → Koh Samui Airport (USM)
Leaves 10:10 a.m. · 23 h trip
1 stop
found today
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$223 3 Aug 2027found todayOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 2 days, 7 Oct to 8 Oct, the cheapest one-way we saw each day was $292.
At $223, the cheapest one-way found recently is below that range.
2 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?
Not enough comparable prices yet: we hold one-way fares on 1 departure date and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 3 Aug 2027 to compare.
Every date we hold
2 fares on 1 departure dates
See every date as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 3 Aug 2027 | $223 | Thai Vietjet Air | Incheon International Airport (ICN) → Koh Samui Airport (USM) | 1 stop | found today | Open this trip |
Airlines on the cheapest dates: Thai Vietjet Air.
Premium cabin fares from Seoul 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 20 Jul 2027 – 3 Aug 2027 in another cabin: Premium economy · Business · First
Today's prices for 3 Aug 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Seoul to Koh Samui?
Return
The cheapest fares were 30 to 59 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (23 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 |
|---|---|---|---|---|
| 30–59 days | $486 | $486 | Cheapest seen | 7 |
| 90–179 days | $698 | $484 | +44% | 9 |
| 180+ days | $521 | $502 | +7% | 17 |
One-way
Not enough history yet: we have 2 days of one-way prices, 7 Oct to 8 Oct, and compare booking times once 3 booking ranges have 7 days each.
Live price for these dates
The cheapest return found recently is for 20 Jul 2027 – 3 Aug 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