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Cheap flights from London Heathrow Airport to Ko Samui from £343

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 27/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — USM
30 Mar — 6 Apr1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Ko Samui are usually found in September or May, booked 5 days in advance, depart on a Wednesday or Tuesday 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 25 March 2025.

Round-trip from

£762

One-way from

£343

Popular in

December

Cheapest in

September

Average price

£888
Lufthansa
  • Lufthansa
  • 5/6-14/6
  • 4 total stops
  • 40h 55m total
  • London to Ko Samui
Search Deals
27/4
  • 27/4
  • 3 total stops
  • 40h 10m total
  • London to Ko Samui
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£43 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£20 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2025
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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 25 March 2025.

Thu 5/616:25LHR - USM
2 stops18h 40mLufthansa
Sat 14/616:25USM - LHR
2 stops22h 15mLufthansa
Deal found 24/3£762
Sun 8/617:10LHR - USM
2 stops19h 05mKLM
Wed 18/607:00USM - LHR
2 stops19h 55mKLM
Deal found 24/3£768
Thu 29/508:40LHR - USM
2 stops30h 30mMultiple Airlines
Sat 14/616:25USM - LHR
2 stops22h 15mMultiple Airlines
Deal found 24/3£769
Fri 5/912:30LHR - USM
1 stop26h 30mThai Airways
Fri 12/907:00USM - LHR
1 stop18h 10mThai Airways
Deal found 24/3£789
Mon 9/618:40LHR - USM
2 stops20h 30mSWISS
Mon 16/609:30USM - LHR
2 stops18h 15mSWISS
Deal found 24/3£795
Mon 28/421:35LHR - USM
1 stop16h 55mEVA Air
Mon 26/508:45USM - LHR
1 stop16h 35mEVA Air
Deal found 24/3£820
Tue 13/522:05LHR - USM
1 stop27h 45mSingapore Airlines
Tue 27/508:45USM - LHR
1 stop27h 10mSingapore Airlines
Deal found 25/3£830
Mon 21/418:20LHR - USM
1 stop18h 15mCathay Pacific
Mon 28/410:55USM - LHR
1 stop37h 20mCathay Pacific
Deal found 24/3£860
Fri 5/920:55LHR - USM
2 stops18h 40mEtihad Airways
Fri 12/917:25USM - LHR
2 stops25h 20mEtihad Airways
Deal found 24/3£865
Sun 8/609:00LHR - USM
2 stops19h 30mQatar Airways
Sat 14/617:55USM - LHR
2 stops19h 35mQatar Airways
Deal found 24/3£986

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 25 March 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 5/6

16:25-17:05

2 stops18h 40m

Ko Samui

Sat 14/6

16:25-08:40

2 stops22h 15m

£762

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 8/6

17:10-18:15

2 stops19h 05m

Ko Samui

Wed 18/6

07:00-20:55

2 stops19h 55m

£768

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 29/5

08:40-21:10

2 stops30h 30m

Ko Samui

Sat 14/6

16:25-08:40

2 stops22h 15m

£769

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Fri 5/9

12:30-21:00

1 stop26h 30m

Ko Samui

Fri 12/9

07:00-19:10

1 stop18h 10m

£789

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 9/6

18:40-21:10

2 stops20h 30m

Ko Samui

Mon 16/6

09:30-21:45

2 stops18h 15m

£795

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 28/4

21:35-20:30

1 stop16h 55m

Ko Samui

Mon 26/5

08:45-19:20

1 stop16h 35m

£820

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 13/5

22:05-07:50

1 stop27h 45m

Ko Samui

Tue 27/5

08:45-05:55

1 stop27h 10m

£830

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 21/4

18:20-18:35

1 stop18h 15m

Ko Samui

Mon 28/4

10:55-18:15

1 stop37h 20m

£860

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Fri 5/9

20:55-21:35

2 stops18h 40m

Ko Samui

Fri 12/9

17:25-12:45

2 stops25h 20m

£865

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 8/6

09:00-10:30

2 stops19h 30m

Ko Samui

Sat 14/6

17:55-07:30

2 stops19h 35m

£986

Flights are sorted by cheapest return flights first.

Deals found on 24/3

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 21 March 2025.

The best time to book flights from London Heathrow Airport to Ko Samui is 5 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 £1,617). 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 25 March 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 23 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.

Rainfall in Ko Samui by month

Plan your trip to Ko Samui by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ko Samui ranges from 58.0 - 490.0 inches per month. November is typically the wettest month, when rainfall can reach 490.0 mm. February is typically the driest time to visit Ko Samui when rainfall is around 58.0 mm.

Temperature in Ko Samui by month

Plan your trip to Ko Samui by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ko Samui, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 29.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 27.0 C).

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 25 March 2025.
Get a feel of what it's like to fly with EVA Air, Singapore Airlines and Emirates from London to Ko Samui by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very Good
1,171 reviews
Check prices

Crew

8.6

Entertainment

8.0

Food

8.1

Boarding

8.4

Comfort

8.3

Overall

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.
EVA Air
8.4
Very Good
1,171 reviews
EVA Air
8.4
Very Good
1,171 reviews
Check prices

Crew

8.6

Entertainment

8.0

Food

8.1

Boarding

8.4

Comfort

8.3

Overall

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.
Singapore Airlines
8.1
Very Good
1,284 reviews
EVA Air
8.4
Very Good
1,171 reviews
Check prices

Crew

8.6

Entertainment

8.0

Food

8.1

Boarding

8.4

Comfort

8.3

Overall

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.
Emirates
8.0
Very Good
3,190 reviews
EVA Air
8.4
Very Good
1,171 reviews
Check prices

Crew

8.6

Entertainment

8.0

Food

8.1

Boarding

8.4

Comfort

8.3

Overall

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.
KLM
7.8
Good
1,318 reviews
EVA Air
8.4
Very Good
1,171 reviews
Check prices

Crew

8.6

Entertainment

8.0

Food

8.1

Boarding

8.4

Comfort

8.3

Overall

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.
Thai Airways
7.8
Good
316 reviews
EVA Air
8.4
Very Good
1,171 reviews
Check prices

Crew

8.6

Entertainment

8.0

Food

8.1

Boarding

8.4

Comfort

8.3

Overall

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

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 9 airlines. Ko Samui is conveniently located just 2.1 mi from Ko Samui’s city center.

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

    Currently priced at £762, Lufthansa will fly you from London Heathrow Airport to Ko Samui and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from KLM and Thai Airways - these airlines can fly you to your destination from £768 and £789, respectively. Lufthansa is currently priced 18% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London Heathrow Airport to Ko Samui one-way?

    The cheapest airline one-way is Qatar Airways, with whom users have recently found tickets for as low as £518. However, be on the lookout for offers from Thai Airways and Emirates, as they are both options that can get you from London Heathrow Airport to Ko Samui for a low price.

  • 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, Thailand Cultural Center, and Siam Square more than anywhere else. Travelers on a layover in Bangkok can visit Pratunam, Thailand Cultural Center, and Siam Square, by traveling 14.8 mi, 13.1 mi, and 15.1 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 £19 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 £1,617). 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

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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.
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London City to Don Mueang Intl flights
Gatwick to Surat Thani flights
Heathrow to Trat flights
Southend to Krabi flights
Gatwick to Trat flights

Top 9 airlines flying from Heathrow to Ko Samui

Discover the top 9 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 25 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Air FranceCheapest£620Average£760FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapest£634Average£737FlexibilityNo cancel feeOn-time75%
Search KLM flights
Etihad AirwaysCheapest£643Average£715FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
EVA AirCheapest£741Average£833FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
Singapore AirlinesCheapest£745Average£1,048FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Austrian AirlinesCheapest£753Average£898FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
British AirwaysCheapest£757Average£1,141FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Thai AirwaysCheapest£812Average£1,062FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights
Qatar AirwaysCheapest£832Average£1,087FlexibilityNo 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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