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Ko Samui

$513+ Cheap flights from Heathrow (LHR) to Ko Samui (USM)

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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — USM
Apr 21 — Apr 281
Tue 4/21
Tue 4/28
1 adult, Economy
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Find cheap flights from Heathrow to Ko Samui with Cheapflights

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Cheapflights Tip: The best prices from London Heathrow to Ko Samui are usually found in June or May, booked 2 days in advance, depart on a Friday or Wednesday and return on a Wednesday

Cheap 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 March 22, 2026.

This SmartFares deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/159:10 pm
LHR
-
USM
2 stops29h 15m
Multiple Airlines
Thu 4/236:00 am
USM
-
LHR
2 stops18h 45m
Multiple Airlines
Deal found 3/20$1,028
This FlightHub deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/198:45 pm
LHR
-
USM
2 stops18h 50m
Etihad Airways
Sun 4/265:55 pm
USM
-
LHR
2 stops24h 50m
Etihad Airways
Deal found 3/22$1,035
This Gotogate deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/289:45 pm
LHR
-
USM
2 stops27h 50m
Multiple Airlines
Tue 6/301:30 pm
USM
-
LHR
2 stops23h 25m
Multiple Airlines
Deal found 3/22$1,038
This Etihad Airways deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/219:30 am
LHR
-
USM
2 stops19h 35m
Etihad Airways
Thu 4/306:00 am
USM
-
LHR
2 stops18h 45m
Etihad Airways
Deal found 3/18$1,042
This Etihad Airways deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/209:30 am
LHR
-
USM
2 stops19h 35m
Etihad Airways
Mon 5/47:00 pm
USM
-
LHR
2 stops23h 45m
Etihad Airways
Deal found 3/22$1,043
This Etihad Airways deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/279:30 am
LHR
-
USM
2 stops19h 15m
Etihad Airways
Thu 6/255:50 pm
USM
-
LHR
2 stops24h 55m
Etihad Airways
Deal found 3/21$1,045
This FlightHub deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/305:30 pm
LHR
-
USM
2 stops20h 35m
Multiple Airlines
Wed 12/169:20 am
USM
-
LHR
2 stops29h 45m
Multiple Airlines
Deal found 3/22$1,046
This FlightHub deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/12:45 pm
LHR
-
USM
2 stops23h 40m
Etihad Airways
Fri 5/159:00 pm
USM
-
LHR
2 stops21h 45m
Etihad Airways
Deal found 3/22$1,055
This Etihad Airways deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/199:45 pm
LHR
-
USM
2 stops17h 50m
Etihad Airways
Thu 5/76:00 am
USM
-
LHR
2 stops18h 45m
Etihad Airways
Deal found 3/22$1,056
This Etihad Airways deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/219:30 am
LHR
-
USM
2 stops19h 35m
Etihad Airways
Tue 6/26:00 am
USM
-
LHR
2 stops18h 45m
Etihad Airways
Deal found 3/20$1,057
This Justfly.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3010:00 am
LHR
-
USM
2 stops22h 45m
Multiple Airlines
Fri 5/152:35 pm
USM
-
LHR
2 stops22h 20m
Multiple Airlines
Deal found 3/20$1,058
This Etihad Airways deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/238:45 pm
LHR
-
USM
2 stops18h 50m
Etihad Airways
Wed 6/37:00 pm
USM
-
LHR
2 stops23h 45m
Etihad Airways
Deal found 3/20$1,059

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 March 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,028
(SmartFares)

One-way from

$513
(Kiwi.com)

Popular in

December

Cheapest in

June

Average price

$1,196
Provider with most accurate pricing for London Heathrow-Ko Samui flight deals.
Search Deals
Provider most trusted by Cheapflights users for London Heathrow-Ko Samui flights.
Search Deals
From London Heathrow to Ko Samui
Search Deals
One-way flight from London Heathrow to Ko Samui
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($128 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($50 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated March 22, 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 round-trip

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Fri 5/15

2:45 pm-3:45 pm

2 stops19h 00m

Ko Samui

Tue 5/19

3:25 pm-7:00 am

2 stops21h 35m

$1,055
Quickest round-trip

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Fri 5/1

9:25 pm-8:30 pm

1 stop17h 05m

Ko Samui

Fri 5/15

9:15 am-7:15 pm

1 stop16h 00m

$1,348

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 8/18

9:00 am-10:30 am

2 stops19h 30m

Ko Samui

Tue 9/1

6:00 am-6:00 pm

2 stops18h 00m

$1,449

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sat 6/13

9:35 pm-9:35 pm

1 stop18h 00m

Ko Samui

Fri 6/26

7:50 am-7:20 pm

1 stop17h 30m

$1,504

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 8/13

9:00 am-10:30 am

2 stops19h 30m

Ko Samui

Thu 9/3

5:55 pm-7:30 am

2 stops19h 35m

$1,528

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 4/9

7:10 am-7:40 pm

2 stops30h 30m

Ko Samui

Sun 5/10

11:55 am-3:15 pm

1 stop33h 20m

$1,543

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 8/17

10:50 am-11:55 am

2 stops19h 05m

Ko Samui

Sat 9/5

5:55 pm-6:25 am

2 stops18h 30m

$1,563

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 8/11

9:00 am-10:30 am

2 stops19h 30m

Ko Samui

Wed 9/2

5:55 pm-6:25 am

2 stops18h 30m

$1,593

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 5/5

8:15 pm-7:40 pm

1 stop17h 25m

Ko Samui

Wed 5/20

11:55 am-4:10 pm

2 stops34h 15m

$1,619
Cheapest one-way

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 5/11

2:45 pm-5:45 pm

2 stops21h 00m

$619

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/17

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

Compare providers for flights from Heathrow to Ko Samui

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Ko Samui in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London Heathrow Airport-Ko Samui flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Ko Samui flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Ko Samui flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London Heathrow Airport-Ko Samui flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Ko Samui flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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 round-trip flight from Heathrow to Ko Samui. Price data was last updated on March 13, 2026.

The price you pay for your flight from London Heathrow Airport to Ko Samui may vary depending on when you book. For the best chance of a lower fare, look to book 2 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 $669). Flying from London Heathrow Airport to Ko Samui in September is currently the most expensive (average of $929). 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 March 22, 2026.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Ko Samui in the afternoon. If you’re flexible enough to do this you can expect to save up to 42% 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 round-trip from Heathrow to Ko Samui. Price data was last updated on March 30, 2025.

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

The best insider tips for London Heathrow Airport to Ko Samui flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Ko Samui trip
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on Virgin Atlantic

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Gabriel Leigh

Gabriel Leigh

Expert on British Airways

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more

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?

    For a flight from London Heathrow to Ko Samui, you will be flying into Ko Samui. Ko Samui (USM) is just 2.1 mi from the center of the city. Ko Samui is the only Ko Samui airport and it handles 0 inbound flights from London Heathrow per day. 0 airlines have flights to Ko Samui from London Heathrow on a regular basis.

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

    For as low as $1,055, Etihad Airways can have you in Ko Samui from London Heathrow Airport in 19h. The distance between London Heathrow Airport and Ko Samui is about 6144 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 vacation 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 $669). Flying from London Heathrow Airport to Ko Samui in September is currently the most expensive (average of $929). 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

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

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