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Cheap flights from London Heathrow Airport to Ko Samui from £355

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 Heathrow Airport to Ko Samui departing on 25/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London Heathrow Airport to Ko Samui

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
20:25 - 12:20LHR-USM
32h 55m2 stops
Multiple Airlines Logo
18:15 - 15:55USM-LHR
28h 40m2 stops
£697Multiple Airlines
Find Deal
Sun, 16 Nov - Thu, 27 Nov
Multiple Airlines Logo
16:40 - 21:05LHR-USM
21h 25m2 stops
Multiple Airlines Logo
08:55 - 08:45USM-LHR
30h 50m2 stops
£707Multiple Airlines
Find Deal
Sat, 24 Jan - Sat, 31 Jan
Multiple Airlines Logo
17:40 - 08:25LHR-USM
31h 45m2 stops
Multiple Airlines Logo
14:05 - 15:55USM-LHR
32h 50m2 stops
£712Multiple Airlines
Find Deal
Wed, 25 Feb - Thu, 5 Mar
Etihad Airways Logo
20:55 - 20:50LHR-USM
16h 55m2 stops
Etihad Airways Logo
19:00 - 14:30USM-LHR
26h 30m2 stops
£718Etihad Airways
Find Deal
Sun, 22 Mar - Wed, 25 Mar
Etihad Airways Logo
08:50 - 13:05LHR-USM
21h 15m2 stops
Etihad Airways Logo
21:10 - 12:05USM-LHR
21h 55m2 stops
£719Etihad Airways
Find Deal
Wed, 12 Nov - Sun, 23 Nov
Singapore Airlines Logo
10:40 - 18:50LHR-USM
25h 10m1 stop
Singapore Airlines Logo
19:45 - 15:20USM-LHR
26h 35m1 stop
£760Singapore Airlines
Find Deal
Wed, 12 Nov - Sun, 23 Nov
Singapore Airlines Logo
10:40 - 18:50LHR-USM
25h 10m1 stop
Singapore Airlines Logo
19:45 - 15:20USM-LHR
26h 35m1 stop
£779Singapore Airlines
Find Deal
Mon, 10 Nov - Fri, 21 Nov
SWISS Logo
18:40 - 21:10LHR-USM
20h 30m2 stops
SWISS Logo
16:25 - 07:55USM-LHR
21h 30m2 stops
£780SWISS
Find Deal
Tue, 7 Apr - Wed, 22 Apr
SWISS Logo
18:40 - 21:05LHR-USM
19h 25m2 stops
SWISS Logo
09:20 - 08:05USM-LHR
29h 45m2 stops
£781SWISS
Find Deal
Wed, 7 Jan - Wed, 28 Jan
Cathay Pacific Logo
17:50 - 19:35LHR-USM
18h 45m1 stop
Cathay Pacific Logo
11:40 - 15:00USM-LHR
34h 20m1 stop
£792Cathay Pacific
Find Deal
Wed, 4 Mar - Thu, 19 Mar

Etihad Airways flights from London Heathrow Airport to Ko Samui

Our best Etihad Airways deals on London Heathrow Airport to Ko Samui flight tickets
Etihad Airways
22 Mar
LHR20:55London Heathrow
16h 55m
2 stops
USM20:50Ko Samui
25 Mar
USM19:00Ko Samui
26h 30m
2 stops
LHR14:30London Heathrow
£718
Find similar
Etihad Airways
12 Nov
LHR08:50London Heathrow
21h 15m
2 stops
USM13:05Ko Samui
23 Nov
USM21:10Ko Samui
21h 55m
2 stops
LHR12:05London Heathrow
£719
Find similar
Etihad Airways
6 Nov
LHR13:55London Heathrow
40h 10m
2 stops
USM13:05Ko Samui
11 Nov
USM20:45Ko Samui
24h 45m
2 stops
LHR14:30London Heathrow
£722
Find similar

SWISS flights from London Heathrow Airport to Ko Samui

Our best SWISS deals on London Heathrow Airport to Ko Samui flight tickets
SWISS
7 Apr
LHR18:40London Heathrow
20h 30m
2 stops
USM21:10Ko Samui
22 Apr
USM16:25Ko Samui
21h 30m
2 stops
LHR07:55London Heathrow
£780
Find similar
SWISS
7 Jan
LHR18:40London Heathrow
19h 25m
2 stops
USM21:05Ko Samui
28 Jan
USM09:20Ko Samui
29h 45m
2 stops
LHR08:05London Heathrow
£781
Find similar
SWISS
7 Jan
LHR18:40London Heathrow
19h 25m
2 stops
USM21:05Ko Samui
28 Jan
USM09:20Ko Samui
19h 20m
2 stops
LHR21:40London Heathrow
£786
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport 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 31 October 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 16/11

20:25-12:20

2 stops32h 55m

Ko Samui

Thu 27/11

18:15-15:55

2 stops28h 40m

£697

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sat 24/1

16:40-21:05

2 stops21h 25m

Ko Samui

Sat 31/1

08:55-08:45

2 stops30h 50m

£707

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 25/2

17:40-08:25

2 stops31h 45m

Ko Samui

Thu 5/3

14:05-15:55

2 stops32h 50m

£712

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 22/3

20:55-20:50

2 stops16h 55m

Ko Samui

Wed 25/3

19:00-14:30

2 stops26h 30m

£718

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 12/11

08:50-13:05

2 stops21h 15m

Ko Samui

Sun 23/11

21:10-12:05

2 stops21h 55m

£719

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 12/11

10:40-18:50

1 stop25h 10m

Ko Samui

Sun 23/11

19:45-15:20

1 stop26h 35m

£760

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 10/11

10:40-18:50

1 stop25h 10m

Ko Samui

Fri 21/11

19:45-15:20

1 stop26h 35m

£779

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 7/4

18:40-21:10

2 stops20h 30m

Ko Samui

Wed 22/4

16:25-07:55

2 stops21h 30m

£780

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 7/1

18:40-21:05

2 stops19h 25m

Ko Samui

Wed 28/1

09:20-08:05

2 stops29h 45m

£781

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 4/3

17:50-19:35

1 stop18h 45m

Ko Samui

Thu 19/3

11:40-15:00

1 stop34h 20m

£792

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Ko Samui from

How to get the cheapest flight ticket from London Heathrow Airport 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 Heathrow Airport is in May. Flight prices, which tend to average around £800, are often lower during this time because this is during the off-season. If you don’t want to visit Ko Samui in May, then you should wait until September to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £820.

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 Heathrow Airport. The lowest ticket price found for a Wednesday departure recently was £501. 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 £855.

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 Heathrow Airport to Ko Samui during this time can be as low as £508. Flights at midday are often more expensive, with an average ticket price of £826.

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 Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ko Samui for around £930 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 Heathrow Airport for as low as £815 on momondo.

When to book flights from London Heathrow Airport to Ko Samui

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

Cheap London Heathrow Airport to Ko Samui (LHR to USM) flight deals and tips

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

Direct flights

None
There are no direct flights from London Heathrow Airport to Ko Samui. There are no popular flight routes from London Heathrow Airport to Ko Samui.
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  • How far is London Heathrow to Ko Samui by plane?

    The straight-line distance from London Heathrow to Ko Samui is 6145.4 mi. Flights usually cover this in 16h 15m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from London Heathrow Airport to Ko Samui Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London Heathrow Airport to Ko Samui Airport.

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

    The required travel and health documents for your Ko Samui Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ko Samui Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

Best airlines flying from London Heathrow Airport to Ko Samui

Compare and see reviews for airlines that fly from London Heathrow Airport to Ko Samui with momondo
Airline
Rating
Free Cancellation
Price
Bangkok AirwaysPriceFrom £114Free CancellationRating
8.0
115 reviews
Search Bangkok Airways flights
Air IndiaPriceFrom £419Free CancellationRating
5.5
2,940 reviews
Search Air India flights
Austrian AirlinesPriceFrom £611Free CancellationRating
7.6
862 reviews
Search Austrian Airlines flights
SWISSPriceFrom £619Free CancellationRating
7.5
1,777 reviews
Search SWISS flights
KLMPriceFrom £646Free CancellationRating
7.7
1,406 reviews
Search KLM flights
LufthansaPriceFrom £648Free CancellationRating
6.8
7,543 reviews
Search Lufthansa flights
Etihad AirwaysPriceFrom £658Free CancellationRating
7.4
1,284 reviews
Search Etihad Airways flights
Air FrancePriceFrom £672Free CancellationRating
7.4
1,482 reviews
Search Air France flights
EVA AirPriceFrom £741Free CancellationRating
8.4
1,268 reviews
Search EVA Air flights
British AirwaysPriceFrom £755Free CancellationRating
6.7
7,489 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?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Ko Samui for you.

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

momondo does allow users to show only those flights to Ko Samui from London which offer a flexible booking policy as well as other useful filters and features.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from London to Ko Samui.

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

If you are not ready to book a flight from London to Ko Samui now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ko Samui and let you know when they change.

An easier way to manage your Ko Samui trip

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