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Cheap flights from London Heathrow Airport to Ko Samui from £325

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — USM
6 Sep — 13 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Ko Samui

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Ko Samui
Explore the most affordable flight options available from Heathrow to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 August 2026.

Sun 15/1118:40 -
2 stops19h 25m
Tue 24/1113:25 -
2 stops25h 40m
Deal found 7/8£679
Mon 2/1117:10 -
2 stops20h 55m
Wed 18/1110:00 -
2 stops18h 40m
Deal found 4/8£680
Mon 9/1118:40 -
2 stops19h 25m
Mon 23/1110:00 -
2 stops18h 40m
Deal found 5/8£681
Mon 30/1106:00 -
2 stops26h 35m
Wed 16/1209:20 -
2 stops29h 45m
Deal found 6/8£681
Wed 30/906:00 -
2 stops29h 45m
Thu 15/1008:45 -
2 stops19h 00m
Deal found 4/8£683
Tue 25/822:15 -
2 stops27h 30m
Mon 21/915:50 -
2 stops29h 30m
Deal found 5/8£684
Wed 30/906:00 -
2 stops32h 30m
Wed 14/1020:35 -
2 stops17h 45m
Deal found 4/8£684
Tue 24/1109:00 -
2 stops18h 40m
Thu 17/1210:00 -
2 stops18h 40m
Deal found 7/8£685
Sun 6/906:00 -
2 stops32h 30m
Wed 23/909:15 -
2 stops28h 40m
Deal found 6/8£689
Wed 2/906:00 -
2 stops32h 30m
Mon 21/920:35 -
2 stops17h 45m
Deal found 3/8£691
Sat 21/1117:10 -
2 stops20h 55m
Thu 3/1210:00 -
2 stops29h 05m
Deal found 5/8£693

Find flight deals from Heathrow to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Ko Samui (USM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 7 August 2026.

Round-trip from

£679

One-way from

£325

Popular in

December

Cheapest in

November

Average price

£940
Lufthansa
  • Lufthansa
  • 15/11-24/11
  • 4 total stops
  • 45h 05m total
  • London to Ko Samui
Search Deals
20/9
  • 20/9
  • 3 total stops
  • 39h 15m total
  • London to Ko Samui
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£36 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£22 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow 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, Cheapflights users made 858,174 searches. Data last updated 7 August 2026.
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

Cheapest return flight

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Thu 3/9

14:45-17:05

2 stops20h 20m

Ko Samui

Thu 17/9

06:00-18:45

2 stops18h 45m

£819

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Wed 30/9

19:25-21:10

1 stop19h 45m

Ko Samui

Wed 14/10

16:25-05:35

1 stop19h 10m

£854

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Tue 8/9

19:25-21:10

1 stop19h 45m

Ko Samui

Tue 6/10

16:25-06:35

1 stop20h 10m

£854

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Thu 12/11

09:25-13:50

2 stops21h 25m

Ko Samui

Mon 16/11

15:05-06:20

2 stops22h 15m

£886
Fastest return journey

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Sun 15/11

21:20-19:50

1 stop15h 30m

Ko Samui

Tue 24/11

09:20-19:05

1 stop16h 45m

£931

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Thu 12/11

21:20-19:50

1 stop15h 30m

Ko Samui

Mon 16/11

09:20-19:05

1 stop16h 45m

£944

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Fri 11/9

14:25-18:00

2 stops21h 35m

Ko Samui

Fri 18/9

19:00-14:25

2 stops25h 25m

£963

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Tue 1/12

09:10-10:35

2 stops18h 25m

Ko Samui

Tue 15/12

14:05-11:40

2 stops28h 35m

£996

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Sun 6/12

21:20-19:50

1 stop15h 30m

Ko Samui

Sun 20/12

07:00-19:05

1 stop19h 05m

£1,040

LondonKo Samui

LHR London Heathrow - USM Ko Samui

LHRUSM

London Heathrow

Thu 12/11

18:45-21:05

1 stop19h 20m

Ko Samui

Mon 16/11

13:25-05:20

2 stops22h 55m

£1,097

Flights are sorted by cheapest return flights first.

Deals found on 3/8

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Heathrow to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Heathrow with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Ko Samui

How far ahead should I book a flight from London Heathrow Airport to Ko Samui?

The best time to book flights from London Heathrow Airport to Ko Samui is 84 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from London Heathrow Airport to Ko Samui?

Currently, November is the cheapest month in which you can book a flight from London Heathrow Airport to Ko Samui (average of £788). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £1,234). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from London Heathrow Airport to Ko Samui?

Airfare is below average for this route at the moment.

London Heathrow Airport to Ko Samui flights typically cost between £784 and £1,114 in November.
The cheapest return price found within the last 5 days was £679 on Multiple Airlines (15 Nov–24 Nov).

Reviews of airlines servicing Ko Samui

Get insights into the airlines that provide service to Ko Samui. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ko Samui. Reviews last updated 7 August 2026.
Read through reviews of airlines operating flights from London Heathrow Airport to Ko Samui, such as EVA Air,Singapore Airlines, andThai Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.5
Very Good
1,513 reviews
Check prices

Food

8.1

Overall

8.5

Entertainment

8.0

Comfort

8.3

Crew

8.7

Boarding

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Jan 2026

CGK - TPE

I had lots of room on the exit row. Boarding was quick and easy.
EVA Air
8.5
Very Good
1,513 reviews
EVA Air
8.5
Very Good
1,513 reviews
Check prices

Food

8.1

Overall

8.5

Entertainment

8.0

Comfort

8.3

Crew

8.7

Boarding

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Jan 2026

CGK - TPE

I had lots of room on the exit row. Boarding was quick and easy.
Singapore Airlines
8.2
Very Good
1,583 reviews
EVA Air
8.5
Very Good
1,513 reviews
Check prices

Food

8.1

Overall

8.5

Entertainment

8.0

Comfort

8.3

Crew

8.7

Boarding

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Jan 2026

CGK - TPE

I had lots of room on the exit row. Boarding was quick and easy.
Thai Airways
7.9
Good
413 reviews
EVA Air
8.5
Very Good
1,513 reviews
Check prices

Food

8.1

Overall

8.5

Entertainment

8.0

Comfort

8.3

Crew

8.7

Boarding

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Jan 2026

CGK - TPE

I had lots of room on the exit row. Boarding was quick and easy.
Austrian Airlines
7.6
Good
950 reviews
EVA Air
8.5
Very Good
1,513 reviews
Check prices

Food

8.1

Overall

8.5

Entertainment

8.0

Comfort

8.3

Crew

8.7

Boarding

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Jan 2026

CGK - TPE

I had lots of room on the exit row. Boarding was quick and easy.
Qatar Airways
7.4
Good
3,739 reviews
EVA Air
8.5
Very Good
1,513 reviews
Check prices

Food

8.1

Overall

8.5

Entertainment

8.0

Comfort

8.3

Crew

8.7

Boarding

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Jan 2026

CGK - TPE

I had lots of room on the exit row. Boarding was quick and easy.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ko Samui from London Heathrow?

    Most people fly into Ko Samui (USM) if they book a flight to Ko Samui from London Heathrow. On average, Ko Samui has 0 inbound flights from London Heathrow per day from 12 airlines. Ko Samui is conveniently located just 2.1 mi from Ko Samui’s city center.

  • How long is the flight from London Heathrow Airport to Ko Samui?

    There are many flights that can get you from London Heathrow Airport to Ko Samui in 19h 45m. Fly via Etihad Airways, British Airways, or Qatar Airways to get the fastest option. London Heathrow Airport and Ko Samui are separated by a distance of 6144 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London Heathrow Airport to Ko Samui round-trip?

    Currently priced at £115, Bangkok Airways will fly you from London Heathrow Airport to Ko Samui and back. In addition to Bangkok Airways, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Oman Air and Austrian Airlines - these airlines can fly you to your destination from £460 and £588, respectively. Bangkok Airways is currently priced 87% below the average price you’ll pay for this route.

  • Where are the most common stopover locations when flying from London Heathrow Airport to Ko Samui?

    The most popular stopover on flights from London Heathrow Airport to Ko Samui is Bangkok.

  • What are some popular things to do or see while on a stopover in Bangkok?

    Bangkok travellers tend to visit Pratunam, Siam Square, and Patpong Night Market more than anywhere else. Travelers on a layover in Bangkok can visit Pratunam, Siam Square, and Patpong Night Market, by traveling 14.8 mi, 15.1 mi, and 14.9 mi, respectively after landing at Bangkok Suvarnabhumi. Those looking to explore during their stopover in Bangkok can hire a car from Bangkok Suvarnabhumi for about £18 per day.

  • Where are the least popular stopover locations for London Heathrow Airport to Ko Samui flights?

    London Heathrow Airport to Ko Samui flights that have stopovers will least frequently stop in Singapore.

  • Can I find deals for flights from Heathrow to Ko Samui that include hotel bookings?

    Yes. In addition to deals on Heathrow to Ko Samui flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Ko Samui?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Ko Samui.

  • Can I find deals for business class flights from Heathrow to Ko Samui?

    Yes. Cheapflights offers flight deals from Heathrow to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London Heathrow Airport to Ko Samui?

    Currently, November is the cheapest month in which you can book a flight from London Heathrow Airport to Ko Samui (average of £788). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £1,234). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from Heathrow to Ko Samui

Discover the top 10 airlines that operate flights from Heathrow to Ko Samui. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 7 August 2026.
AirlineCheapestAverageFlexibilityOn-time
Bangkok AirwaysCheapest£115Average£138FlexibilityNo cancel feeOn-time74%
Search Bangkok Airways flights
Oman AirCheapest£460Average£946FlexibilityNo cancel feeOn-time76%
Search Oman Air flights
Austrian AirlinesCheapest£588Average£682FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£599Average£751FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Etihad AirwaysCheapest£610Average£787FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
SWISSCheapest£611Average£698FlexibilityNo cancel feeOn-time79%
Search SWISS flights
British AirwaysCheapest£714Average£1,162FlexibilityNo cancel feeOn-time70%
Search British Airways flights
EVA AirCheapest£721Average£841FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
Singapore AirlinesCheapest£752Average£950FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Qatar AirwaysCheapest£792Average£907FlexibilityNo cancel feeOn-time68%
Search Qatar Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to Ko Samui?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Ko Samui. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Ko Samui?

Cheapflights simply makes it quick and affordable to book flights from Heathrow to Ko Samui by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Heathrow to Ko Samui with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Heathrow to Ko Samui, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Heathrow to Ko Samui become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ko Samui from Heathrow today and book when prices fit your budget.

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