Find flights
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to Ko Samui from £352

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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — USM
1 Sep — 8 Sep1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Ko Samui are usually found in May or September, booked 60 days in advance, depart on a Wednesday or Monday and return on a Friday

Cheap 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 27 August 2025.

Round-trip from

£701

One-way from

£352

Popular in

December

Cheapest in

May

Average price

£1,050
27/10-28/11
  • 27/10-28/11
  • 5 total stops
  • 50h 20m total
  • London to Ko Samui
Search Deals
6/9
  • 6/9
  • 2 total stops
  • 38h 15m total
  • London to Ko Samui
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£64 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 August 2025
Search Deals

Find flight deals from Heathrow to Ko Samui

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 27 August 2025.

Mon 27/1015:45LHR - USM
3 stops21h 40mMultiple Airlines
Fri 28/1108:15USM - LHR
2 stops28h 40mMultiple Airlines
Deal found 26/8£701
Sun 28/910:00LHR - USM
2 stops20h 45mMultiple Airlines
Fri 17/1013:30USM - LHR
2 stops23h 25mMultiple Airlines
Deal found 27/8£707
Sun 28/910:00LHR - USM
2 stops20h 45mMultiple Airlines
Sun 12/1013:30USM - LHR
2 stops23h 25mMultiple Airlines
Deal found 26/8£708
Mon 6/1018:40LHR - USM
2 stops20h 30mSWISS
Mon 8/1216:25USM - LHR
2 stops22h 40mSWISS
Deal found 26/8£711
Wed 26/1106:00LHR - USM
2 stops26h 40mMultiple Airlines
Wed 25/216:25USM - LHR
2 stops23h 20mMultiple Airlines
Deal found 25/8£712
Mon 6/1018:40LHR - USM
2 stops20h 30mMultiple Airlines
Mon 13/1008:45USM - LHR
2 stops29h 10mMultiple Airlines
Deal found 26/8£718
Tue 30/914:40LHR - USM
2 stops23h 50mMultiple Airlines
Wed 29/1007:00USM - LHR
2 stops36h 15mMultiple Airlines
Deal found 26/8£739
Sat 6/922:15LHR - USM
2 stops27h 35mMultiple Airlines
Thu 11/919:00USM - LHR
3 stops31h 50mMultiple Airlines
Deal found 25/8£746

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 27 August 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Ko Samui that are best for you.

Fly from

Heathrow

Fly to

Ko Samui

Route

Depart

Return

Price

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 27/10

15:45-20:25

3 stops21h 40m

Ko Samui

Fri 28/11

08:15-05:55

2 stops28h 40m

£701

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 30/11

13:55-15:40

2 stops18h 45m

Ko Samui

Thu 29/1

10:00-21:40

2 stops18h 40m

£707

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 28/9

10:00-12:45

2 stops20h 45m

Ko Samui

Fri 17/10

13:30-06:55

2 stops23h 25m

£707

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 28/9

10:00-12:45

2 stops20h 45m

Ko Samui

Sun 12/10

13:30-06:55

2 stops23h 25m

£708

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 3/11

18:40-21:05

2 stops19h 25m

Ko Samui

Mon 1/12

20:30-08:05

2 stops18h 35m

£708

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 6/10

18:40-21:10

2 stops20h 30m

Ko Samui

Mon 8/12

16:25-08:05

2 stops22h 40m

£711

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 9/10

14:40-18:30

2 stops21h 50m

Ko Samui

Thu 16/10

08:45-07:30

2 stops28h 45m

£711

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 26/11

06:00-15:40

2 stops26h 40m

Ko Samui

Wed 25/2

16:25-08:45

2 stops23h 20m

£712

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 6/10

18:40-21:10

2 stops20h 30m

Ko Samui

Mon 13/10

08:45-07:55

2 stops29h 10m

£718

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sat 6/9

22:15-18:30

2 stops38h 15m

£352

Flights are sorted by cheapest return flights first.

Deals found on 25/8

Showing 1-10 of 16 results
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?

Use this chart to determine the optimal time to book a return flight from Heathrow to Ko Samui. Price data was last updated on 22 August 2025.

The best time to book flights from London Heathrow Airport to Ko Samui is 60 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Ko Samui (average of £1,019). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £1,669). 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.

What is the cheapest time of day to fly from LHR to USM?

Find hourly flight availability from Heathrow to Ko Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 27 August 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Ko Samui at midday. If you’re flexible enough to do this you can expect to save up to 38% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from London Heathrow Airport to Ko Samui?

Use this chart to determine the cheapest time to fly return from Heathrow to Ko Samui. Price data was last updated on 30 March 2025.

Travellers seeking maximum savings on their London Heathrow Airport to Ko Samui flight should consider departing on Wednesday at midday when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 27 August 2025.
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
8.4
Very Good
1,234 reviews
Check prices

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very Good
1,234 reviews
EVA Air
8.4
Very Good
1,234 reviews
Check prices

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Singapore Airlines
8.1
Very Good
1,352 reviews
EVA Air
8.4
Very Good
1,234 reviews
Check prices

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Thai Airways
7.8
Good
344 reviews
EVA Air
8.4
Very Good
1,234 reviews
Check prices

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Qatar Airways
7.4
Good
3,607 reviews
EVA Air
8.4
Very Good
1,234 reviews
Check prices

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
British Airways
6.7
Okay
7,310 reviews
EVA Air
8.4
Very Good
1,234 reviews
Check prices

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

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 18h 45m. Fly via Austrian Airlines to get the fastest option. London Heathrow Airport and Ko Samui are separated by a distance of 6144 mi.

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

    Currently priced at £112, 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 Austrian Airlines and Air France - these airlines can fly you to your destination from £598 and £601, 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 Siam Square, Pratunam, and Thailand Cultural Center more than anywhere else. Travelers on a layover in Bangkok can visit Siam Square, Pratunam, and Thailand Cultural Center, by traveling 15.1 mi, 14.8 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 £20 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Ko Samui (average of £1,019). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £1,669). 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

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.

Alternative routes for Heathrow to Ko Samui

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Suvarnabhumi flights
Gatwick to Suvarnabhumi flights
London City to Suvarnabhumi flights
Stansted to Suvarnabhumi flights
Heathrow to Don Mueang Intl flights
Luton to Suvarnabhumi flights
Heathrow to Phuket City flights
Gatwick to Phuket City flights
Stansted to Phuket City flights
London City to Phuket City flights
Gatwick to Don Mueang Intl flights
Heathrow to Chiang Mai flights
Heathrow to Krabi flights
Gatwick to Ko Samui flights
London City to Ko Samui flights
Stansted to Ko Samui flights
Gatwick to Krabi flights
Stansted to Krabi flights
Luton to Phuket City flights
Gatwick to Chiang Mai flights
Stansted to Chiang Mai flights
London City to Chiang Mai flights
Southend to Suvarnabhumi flights
London City to Krabi flights
Gatwick to Rayong flights
Heathrow to Udon Thani flights
Luton to Krabi flights
Heathrow to Rayong flights
Heathrow to Hat Yai flights
Heathrow to Chiang Rai flights
Gatwick to Khon Kaen flights
Heathrow to Trat flights
Heathrow to Surat Thani flights
Gatwick to Surat Thani flights
Gatwick to Chiang Rai flights
Southend to Krabi flights
Luton to Chiang Mai flights
Luton to Ko Samui flights
Gatwick to Trat flights
Stansted to Trat flights

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 27 August 2025.
AirlineCheapestAverageFlexibilityOn-time
Bangkok AirwaysCheapest£112Average£142FlexibilityNo cancel feeOn-time74%
Search Bangkok Airways flights
Austrian AirlinesCheapest£598Average£723FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Air FranceCheapest£601Average£729FlexibilityNo cancel feeOn-time77%
Search Air France flights
SWISSCheapest£603Average£647FlexibilityNo cancel feeOn-time79%
Search SWISS flights
EmiratesCheapest£620Average£827FlexibilityNo cancel feeOn-time75%
Search Emirates flights
KLMCheapest£632Average£764FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£633Average£701FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Etihad AirwaysCheapest£677Average£730FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
EVA AirCheapest£728Average£834FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
British AirwaysCheapest£738Average£1,181FlexibilityNo cancel feeOn-time70%
Search British 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.