Cheap flights from London to Ko Samui from £307

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Ko Samui departing on 15/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from London to Ko Samui

Cheap return flights

 Logo
05:45 - 20:25LGW-USM
32h 40m3 stops
 Logo
07:00 - 18:30USM-LGW
18h 30m1 stop
Thu, 4 Sep - Wed, 29 Oct
 Logo
10:30 - 20:25LGW-USM
26h 55m2 stops
 Logo
07:00 - 14:00USM-LGW
38h 00m2 stops
Sat, 22 Nov - Sat, 6 Dec
Austrian Airlines Logo
19:30 - 17:45LHR-USM
16h 15m2 stops
Austrian Airlines Logo
19:30 - 09:00USM-LHR
19h 30m2 stops
£610Austrian Airlines
Find Deal
Fri, 12 Sep - Sun, 28 Sep
 Logo
19:30 - 17:45LHR-USM
16h 15m2 stops
 Logo
09:15 - 07:55USM-LHR
28h 40m2 stops
Wed, 10 Sep - Wed, 17 Sep
SWISS Logo
18:40 - 21:05LHR-USM
19h 25m2 stops
SWISS Logo
09:20 - 21:40USM-LHR
19h 20m2 stops
£625SWISS
Find Deal
Mon, 17 Nov - Mon, 24 Nov
SWISS Logo
09:00 - 21:05LHR-USM
29h 05m2 stops
SWISS Logo
09:20 - 17:50USM-LHR
39h 30m2 stops
£641SWISS
Find Deal
Thu, 30 Oct - Mon, 3 Nov
Air France Logo
17:35 - 21:10LHR-USM
21h 35m2 stops
Air France Logo
08:45 - 08:00USM-LHR
29h 15m2 stops
£691Air France
Find Deal
Sun, 7 Sep - Sun, 28 Sep
Qatar Airways Logo
14:55 - 10:30LGW-USM
37h 35m2 stops
Qatar Airways Logo
17:55 - 06:40USM-LGW
18h 45m2 stops
£719Qatar Airways
Find Deal
Thu, 11 Sep - Thu, 18 Sep
Qatar Airways Logo
14:55 - 10:30LGW-USM
37h 35m2 stops
Qatar Airways Logo
08:00 - 06:40USM-LGW
28h 40m2 stops
£743Qatar Airways
Find Deal
Thu, 18 Sep - Sat, 27 Sep
Singapore Airlines Logo
09:20 - 10:50LGW-USM
18h 30m1 stop
Singapore Airlines Logo
19:25 - 06:25USM-LGW
18h 00m1 stop
£794Singapore Airlines
Find Deal
Mon, 17 Nov - Mon, 24 Nov

Austrian Airlines flights from London to Ko Samui

Our best Austrian Airlines deals on London to Ko Samui flight tickets
Austrian Airlines
12 Sept
LHR19:30London Heathrow
16h 15m
2 stops
USM17:45Ko Samui
28 Sept
USM19:30Ko Samui
19h 30m
2 stops
LHR09:00London Heathrow
Austrian Airlines
12 Sept
LHR06:00London Heathrow
29h 45m
2 stops
USM17:45Ko Samui
19 Sept
USM19:15Ko Samui
19h 05m
2 stops
LHR08:20London Heathrow
Austrian Airlines
12 Sept
LHR19:30London Heathrow
17h 00m
2 stops
USM18:30Ko Samui
28 Sept
USM19:30Ko Samui
18h 50m
2 stops
LHR08:20London Heathrow

KLM flights from London to Ko Samui

Our best KLM deals on London to Ko Samui flight tickets
KLM
28 Sept
LHR17:10London Heathrow
19h 05m
2 stops
USM18:15Ko Samui
17 Oct
USM08:00Ko Samui
18h 55m
2 stops
LHR20:55London Heathrow
KLM
21 Oct
LHR17:10London Heathrow
19h 05m
2 stops
USM18:15Ko Samui
27 Oct
USM07:00Ko Samui
20h 50m
2 stops
LHR20:50London Heathrow
KLM
5 Aug
LCY17:50London City
18h 25m
2 stops
USM18:15Ko Samui
30 Aug
USM16:25Ko Samui
26h 50m
2 stops
LCY13:15London City

momondo Fare Finder

 
Customise your flight search to find flights from London to Ko Samui that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 30 July 2025.
Use the filters below to find and compare flights from London to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonKo Samui

LGW - USM

LGWUSM

London Gatwick

Thu 4/9

05:45-20:25

3 stops32h 40m

Ko Samui

Wed 29/10

07:00-18:30

1 stop18h 30m

£571

LondonKo Samui

LGW - USM

LGWUSM

London Gatwick

Sat 22/11

10:30-20:25

2 stops26h 55m

Ko Samui

Sat 6/12

07:00-14:00

2 stops38h 00m

£590

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Fri 12/9

19:30-17:45

2 stops16h 15m

Ko Samui

Sun 28/9

19:30-09:00

2 stops19h 30m

£610

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 10/9

19:30-17:45

2 stops16h 15m

Ko Samui

Wed 17/9

09:15-07:55

2 stops28h 40m

£615

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 17/11

18:40-21:05

2 stops19h 25m

Ko Samui

Mon 24/11

09:20-21:40

2 stops19h 20m

£625

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 30/10

09:00-21:05

2 stops29h 05m

Ko Samui

Mon 3/11

09:20-17:50

2 stops39h 30m

£641

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 7/9

17:35-21:10

2 stops21h 35m

Ko Samui

Sun 28/9

08:45-08:00

2 stops29h 15m

£691

LondonKo Samui

LGW - USM

LGWUSM

London Gatwick

Thu 11/9

14:55-10:30

2 stops37h 35m

Ko Samui

Thu 18/9

17:55-06:40

2 stops18h 45m

£719

LondonKo Samui

LGW - USM

LGWUSM

London Gatwick

Thu 18/9

14:55-10:30

2 stops37h 35m

Ko Samui

Sat 27/9

08:00-06:40

2 stops28h 40m

£743

LondonKo Samui

LGW - USM

LGWUSM

London Gatwick

Mon 17/11

09:20-10:50

1 stop18h 30m

Ko Samui

Mon 24/11

19:25-06:25

1 stop18h 00m

£794

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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2

See travel insights to Ko Samui from

How to get the cheapest flight ticket from London to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Ko Samui?

The cheapest month to fly to Ko Samui from London is in September. Flight prices, which tend to average around £794, are often lower during this time because this is during the off-season. If you don’t want to visit Ko Samui in September, then you should wait until May to fly from London, when ticket prices are also cheap, with an average price of £809.

What is the cheapest day to depart on your flight to Ko Samui?

According to our data, Wednesday is the cheapest day to fly to Ko Samui from London. The lowest ticket price found for a Wednesday departure recently was £495. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Ko Samui on Sunday is £845.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our most recent data shows that the best time of day to fly to Ko Samui is in the afternoon. Flights from London to Ko Samui during this time can be as low as £502. Flights at midday are often more expensive, with an average ticket price of £815.

How far in advance should I book a flight to Ko Samui?

You are more likely to see cheaper flights to Ko Samui from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Ko Samui for around £916 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ko Samui from London for as low as £796 on momondo.

How have London to Ko Samui flight prices changed over time?

As of July 2025, prices for London to Ko Samui flights are approximately 32% more expensive when compared to flights at the same time last year.

When to book flights from London to Ko Samui

Are you open to changing your travel dates? Check out the ideal times to fly from London to Ko Samui according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London to Ko Samui (LON to USM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Ko Samui

Best price found

£307

Fastest flight time

14h 55m

Direct flights

None

Airports in Ko Samui

1 airport
The best one-way flight to Ko Samui from London in the past 72 hours is £307. The best return flight deal from London to Ko Samui found on momondo in the last 72 hours is £571.
The fastest flight from London to Ko Samui takes 14h 55m
There are no direct flights from London to Ko Samui. Popular non-direct routes for this connection are London Gatwick Airport - Ko Samui Airport, London Heathrow Airport - Ko Samui Airport and London Stansted Airport - Ko Samui Airport.
There is 1 airport near Ko Samui: Ko Samui (USM)

  • How far is London to Ko Samui by plane?

    London and Ko Samui are 6131.1 mi apart from one another. In terms of flight time, this usually takes a little over 16h 15m.

  • When did momondo last update prices for flights from London to Ko Samui Airport?

    Prices for flights from London to Ko Samui Airport are updated daily.

  • How many operators does momondo search for flights from London to Ko Samui Airport?

  • How old do you have to be to fly from London to Ko Samui Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The travel and health documents you'll need for your trip to Ko Samui Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ko Samui Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from London to Ko Samui?


Best airlines flying from London to Ko Samui

Compare and see reviews for airlines that fly from London to Ko Samui with momondo
Airline
Rating
Free Cancellation
Price
Bangkok AirwaysPriceFrom £113Free CancellationRating
8.0
112 reviews
Search Bangkok Airways flights
Air FrancePriceFrom £607Free CancellationRating
7.5
1,465 reviews
Search Air France flights
SWISSPriceFrom £612Free CancellationRating
7.5
1,683 reviews
Search SWISS flights
KLMPriceFrom £620Free CancellationRating
7.8
1,383 reviews
Search KLM flights
EmiratesPriceFrom £626Free CancellationRating
8.1
3,295 reviews
Search Emirates flights
LufthansaPriceFrom £639Free CancellationRating
6.8
7,265 reviews
Search Lufthansa flights
Austrian AirlinesPriceFrom £662Free CancellationRating
7.6
821 reviews
Search Austrian Airlines flights
Etihad AirwaysPriceFrom £683Free CancellationRating
7.4
1,228 reviews
Search Etihad Airways flights
EVA AirPriceFrom £736Free CancellationRating
8.4
1,221 reviews
Search EVA Air flights
British AirwaysPriceFrom £745Free CancellationRating
6.6
7,215 reviews
Search British Airways flights

Travelling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao
Khanom

Why use momondo?

Why should I use momondo to find a flight deal from London to Ko Samui?

Finding the right flight to Ko Samui from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ko Samui quick and easy, saving you time and money.

Can I find flights from London to Ko Samui with flexible booking policies on momondo?

Yes. All flights to Ko Samui from London on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from London to Ko Samui?

Once you have performed a search for London to Ko Samui flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from London to Ko Samui right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Ko Samui from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.


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