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Cheap flights from London Heathrow Airport to Ko Samui from £357

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — USM
29 Jul — 5 Aug1
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 29 June 2026.

Mon 30/1111:30
LHR
-
USM
2 stops26h 35m
Multiple Airlines
Wed 16/1209:20
USM
-
LHR
2 stops19h 20m
Multiple Airlines
Deal found 29/6£703
Wed 30/920:05
LHR
-
USM
2 stops34h 40m
SWISS
Wed 14/1008:45
USM
-
LHR
2 stops19h 00m
SWISS
Deal found 26/6£705
Wed 14/1012:10
LHR
-
USM
2 stops18h 35m
Multiple Airlines
Thu 29/1009:20
USM
-
LHR
2 stops30h 00m
Multiple Airlines
Deal found 26/6£707
Fri 13/1106:40
LHR
-
USM
2 stops27h 20m
Multiple Airlines
Sat 21/1107:00
USM
-
LHR
2 stops41h 40m
Multiple Airlines
Deal found 27/6£707
Sun 8/1106:00
LHR
-
USM
2 stops29h 55m
Austrian Airlines
Wed 11/1110:00
USM
-
LHR
2 stops18h 40m
Austrian Airlines
Deal found 28/6£709
Tue 1/910:50
LHR
-
USM
2 stops24h 15m
Lufthansa
Tue 29/913:30
USM
-
LHR
2 stops25h 10m
Lufthansa
Deal found 27/6£714
Tue 1/909:00
LHR
-
USM
2 stops25h 35m
Multiple Airlines
Tue 29/916:25
USM
-
LHR
2 stops21h 30m
Multiple Airlines
Deal found 26/6£716
Sun 23/822:15
LHR
-
USM
2 stops27h 30m
Multiple Airlines
Tue 8/906:00
USM
-
LHR
2 stops19h 10m
Multiple Airlines
Deal found 28/6£720
Sun 8/1109:00
LHR
-
USM
2 stops29h 05m
SWISS
Sat 21/1109:20
USM
-
LHR
2 stops19h 20m
SWISS
Deal found 27/6£720
Sat 21/1110:30
LHR
-
USM
2 stops27h 35m
Lufthansa
Thu 3/1216:25
USM
-
LHR
2 stops23h 20m
Lufthansa
Deal found 28/6£724

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 29 June 2026.

Round-trip from

£703

One-way from

£357

Popular in

December

Cheapest in

November

Average price

£844
Austrian Airlines
  • Austrian Airlines
  • 30/11-16/12
  • 4 total stops
  • 45h 55m total
  • London to Ko Samui
Search Deals
9/9
  • 9/9
  • 2 total stops
  • 26h 30m total
  • London to Ko Samui
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£52 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 29 June 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 - USM

LHRUSM

London Heathrow

Sat 21/11

21:00-18:15

1 stop38h 15m

Ko Samui

Thu 3/12

16:25-05:45

1 stop20h 20m

£904

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 22/11

20:55-07:10

2 stops27h 15m

Ko Samui

Tue 24/11

15:05-18:10

2 stops34h 05m

£974

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 6/8

20:50-10:45

2 stops31h 55m

Ko Samui

Sun 30/8

15:20-06:30

2 stops21h 10m

£1,119

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 19/8

19:25-18:15

1 stop16h 50m

Ko Samui

Mon 7/9

13:30-06:35

1 stop23h 05m

£1,198
Fastest return journey

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sat 5/12

18:45-18:15

1 stop16h 30m

Ko Samui

Wed 6/1

13:25-05:20

2 stops22h 55m

£1,231

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 9/8

09:30-18:00

2 stops26h 30m

Ko Samui

Sun 23/8

19:45-14:05

2 stops24h 20m

£1,256

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sat 1/8

17:10-19:40

2 stops20h 30m

Ko Samui

Sat 8/8

11:55-07:55

2 stops26h 00m

£1,303

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 29/7

20:50-21:35

2 stops18h 45m

Ko Samui

Thu 13/8

08:10-06:30

2 stops28h 20m

£1,379

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 3/12

18:45-21:05

1 stop19h 20m

Ko Samui

Sun 3/1

13:25-05:45

1 stop23h 20m

£1,397

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 13/12

18:45-18:15

1 stop16h 30m

Ko Samui

Sun 17/1

13:25-05:20

2 stops22h 55m

£1,416

Flights are sorted by cheapest return flights first.

Deals found on 26/6

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

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 52 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 £813). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £1,258). 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?

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 29 June 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
1,484 reviews
Check prices

Boarding

8.4

Food

8.1

Crew

8.7

Overall

8.5

Entertainment

8.0

Comfort

8.3

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
1,484 reviews
EVA Air
8.5
Very Good
1,484 reviews
Check prices

Boarding

8.4

Food

8.1

Crew

8.7

Overall

8.5

Entertainment

8.0

Comfort

8.3

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
1,556 reviews
EVA Air
8.5
Very Good
1,484 reviews
Check prices

Boarding

8.4

Food

8.1

Crew

8.7

Overall

8.5

Entertainment

8.0

Comfort

8.3

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
407 reviews
EVA Air
8.5
Very Good
1,484 reviews
Check prices

Boarding

8.4

Food

8.1

Crew

8.7

Overall

8.5

Entertainment

8.0

Comfort

8.3

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
937 reviews
EVA Air
8.5
Very Good
1,484 reviews
Check prices

Boarding

8.4

Food

8.1

Crew

8.7

Overall

8.5

Entertainment

8.0

Comfort

8.3

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
7.3
Good
3,736 reviews
EVA Air
8.5
Very Good
1,484 reviews
Check prices

Boarding

8.4

Food

8.1

Crew

8.7

Overall

8.5

Entertainment

8.0

Comfort

8.3

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 13 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 16h 05m. Fly via Oman Air, British Airways, or EVA Air 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 £116, 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 £469 and £600, 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 Thailand Cultural Center more than anywhere else. Travelers on a layover in Bangkok can visit Pratunam, Siam Square, and Thailand Cultural Center, by traveling 14.8 mi, 15.1 mi, and 13.1 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 £17 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 £813). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £1,258). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 29 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Bangkok AirwaysCheapest£116Average£145FlexibilityNo cancel feeOn-time74%
Search Bangkok Airways flights
Oman AirCheapest£469Average£910FlexibilityNo cancel feeOn-time76%
Search Oman Air flights
Austrian AirlinesCheapest£600Average£698FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£612Average£707FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
SWISSCheapest£615Average£715FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Etihad AirwaysCheapest£622Average£800FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
KLMCheapest£645Average£789FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£729Average£1,226FlexibilityNo cancel feeOn-time70%
Search British Airways flights
EVA AirCheapest£729Average£851FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
Singapore AirlinesCheapest£758Average£925FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines 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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