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Cheap flights from London Heathrow Airport to Ko Samui from £273

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — USM
20 Nov — 27 Nov1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from London Heathrow to Ko Samui are usually found in May or September, booked 85 days in advance, depart on a Wednesday or Monday and return on a Friday

Find 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 21 October 2025.

Sat 8/1120:55LHR - USM
2 stops28h 15mMultiple Airlines
Sun 23/1121:10USM - LHR
2 stops21h 55mMultiple Airlines
Deal found 20/10£680
Mon 3/1121:50LHR - USM
2 stops37h 25mMultiple Airlines
Tue 11/1113:25USM - LHR
2 stops24h 10mMultiple Airlines
Deal found 19/10£685
Tue 28/1009:30LHR - USM
2 stops25h 45mMultiple Airlines
Wed 26/1113:25USM - LHR
2 stops24h 10mMultiple Airlines
Deal found 19/10£690
Wed 5/1109:30LHR - USM
2 stops25h 45mMultiple Airlines
Mon 10/1113:25USM - LHR
2 stops24h 10mMultiple Airlines
Deal found 19/10£694
Mon 17/1110:00LHR - USM
2 stops24h 40mMultiple Airlines
Mon 24/1106:45USM - LHR
2 stops36h 30mMultiple Airlines
Deal found 20/10£700
Wed 3/1208:45LHR - USM
2 stops25h 45mMultiple Airlines
Wed 10/1215:50USM - LHR
2 stops21h 45mMultiple Airlines
Deal found 19/10£703
Tue 4/1122:00LHR - USM
3 stops30h 00mMultiple Airlines
Fri 28/1115:50USM - LHR
2 stops34h 30mMultiple Airlines
Deal found 19/10£714
Mon 3/1118:40LHR - USM
2 stops19h 25mMultiple Airlines
Mon 1/1209:20USM - LHR
2 stops19h 20mMultiple Airlines
Deal found 19/10£715
Sun 16/1120:55LHR - USM
2 stops38h 20mEtihad Airways
Mon 24/1120:20USM - LHR
2 stops25h 10mEtihad Airways
Deal found 19/10£719
Tue 11/1117:50LHR - USM
2 stops20h 15mMultiple Airlines
Tue 25/1110:00USM - LHR
2 stops18h 40mMultiple Airlines
Deal found 20/10£721
Sun 9/1109:00LHR - USM
2 stops21h 50mMultiple Airlines
Sun 23/1116:25USM - LHR
2 stops23h 20mMultiple Airlines
Deal found 20/10£732

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 21 October 2025.

Round-trip from

£680

One-way from

£273

Popular in

December

Cheapest in

May

Average price

£817
8/11-23/11
  • 8/11-23/11
  • 4 total stops
  • 50h 10m total
  • London to Ko Samui
Search Deals
10/3
  • 10/3
  • 2 total stops
  • 27h 05m total
  • London to Ko Samui
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£60 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
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 21 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

Heathrow

Fly to

Ko Samui

Route

Depart

Return

Price

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 9/4

20:55-07:20

2 stops28h 25m

Ko Samui

Sun 10/5

17:25-15:15

2 stops27h 50m

£705

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 7/4

20:55-07:35

2 stops28h 40m

Ko Samui

Thu 30/4

19:30-15:15

2 stops25h 45m

£718

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 18/11

10:40-11:00

1 stop17h 20m

Ko Samui

Tue 25/11

18:05-05:55

1 stop18h 50m

£821

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 25/1

08:50-08:40

2 stops16h 50m

Ko Samui

Sun 8/2

13:25-06:40

2 stops24h 15m

£835

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 3/11

10:40-11:00

1 stop17h 20m

Ko Samui

Tue 11/11

18:05-05:55

1 stop18h 50m

£856

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Fri 9/1

06:00-10:40

2 stops21h 40m

Ko Samui

Wed 21/1

09:20-21:40

2 stops19h 20m

£870

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Fri 9/1

09:00-10:40

2 stops18h 40m

Ko Samui

Tue 20/1

09:20-21:40

2 stops19h 20m

£870

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 23/2

10:40-18:15

1 stop24h 35m

Ko Samui

Thu 12/3

16:25-15:20

1 stop29h 55m

£891

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 13/1

17:50-19:35

1 stop18h 45m

Ko Samui

Thu 22/1

11:40-17:20

1 stop36h 40m

£896

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 13/1

17:50-19:35

1 stop18h 45m

Ko Samui

Wed 21/1

11:40-20:10

1 stop39h 30m

£896

Flights are sorted by cheapest return flights first.

Deals found on 20/10

Showing 1-10 of 21 results
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?

Use this chart to determine the optimal time to book a return flight from Heathrow to Ko Samui. Price data was last updated on 17 October 2025.

The best time to book flights from London Heathrow Airport to Ko Samui is 85 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, October is the cheapest month in which you can book a flight from London Heathrow Airport to Ko Samui (average of £513). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £846). 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 21 October 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 37% 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 21 October 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
1,254 reviews
Check prices

Boarding

8.4

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
EVA Air
8.4
Very Good
1,254 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Boarding

8.4

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
Singapore Airlines
8.1
Very Good
1,383 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Boarding

8.4

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
Thai Airways
7.8
Good
359 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Boarding

8.4

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
KLM
7.7
Good
1,404 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Boarding

8.4

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
British Airways
6.7
Okay
7,462 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Boarding

8.4

Overall

8.4

Food

8.1

Comfort

8.3

Entertainment

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak

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 17h 20m. Fly via Etihad Airways or Singapore Airlines 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 £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 Air India and Austrian Airlines - these airlines can fly you to your destination from £411 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, October is the cheapest month in which you can book a flight from London Heathrow Airport to Ko Samui (average of £513). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £846). 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

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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
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Stansted to Ko Samui flights
Southend to Suvarnabhumi flights
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Stansted to Krabi flights
Gatwick to Chiang Mai flights
London City to Krabi flights
Stansted to Chiang Mai flights
London City to Chiang Mai flights
Luton to Krabi flights
Luton to Ko Samui flights
Gatwick to Rayong flights
Heathrow to Rayong flights
Luton to Chiang Mai flights
Heathrow to Udon Thani flights
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Gatwick to Chiang Rai flights
Heathrow to Hat Yai flights
Heathrow to Trat flights
Southend to Krabi flights
Heathrow to Surat Thani flights
Gatwick to Khon Kaen flights
Stansted to Trat flights
Gatwick to Trat flights
Gatwick to Surat Thani 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 21 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Bangkok AirwaysCheapest£112Average£142FlexibilityNo cancel feeOn-time74%
Search Bangkok Airways flights
Air IndiaCheapest£411Average£476FlexibilityNo cancel feeOn-timeN/A
Search Air India flights
Austrian AirlinesCheapest£600Average£697FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
SWISSCheapest£608Average£694FlexibilityNo cancel feeOn-time79%
Search SWISS flights
KLMCheapest£634Average£764FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£636Average£704FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Etihad AirwaysCheapest£646Average£741FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Air FranceCheapest£659Average£830FlexibilityNo cancel feeOn-time77%
Search Air France flights
EVA AirCheapest£729Average£835FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
British AirwaysCheapest£741Average£1,185FlexibilityNo 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.

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