Cheap flights from London Heathrow Airport to Ko Samui from £362
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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — USM
18 Feb — 25 Feb1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Ko Samui are usually found in May or November, booked 2 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 19 January 2026.
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 19 January 2026.
Fri 4/1207:40
LHR
-
USM
2 stops30h 25m
Lufthansa
Mon 14/1216:25
USM
-
LHR
2 stops25h 00m
Lufthansa
Deal found 18/1£735
Mon 13/414:45
LHR
-
USM
2 stops24h 50m
Etihad Airways
Wed 6/518:55
USM
-
LHR
2 stops26h 10m
Etihad Airways
Deal found 18/1£736
Tue 5/521:45
LHR
-
USM
2 stops31h 00m
Etihad Airways
Thu 18/620:35
USM
-
LHR
2 stops28h 10m
Etihad Airways
Deal found 18/1£737
Mon 6/414:45
LHR
-
USM
2 stops34h 25m
Etihad Airways
Thu 7/520:35
USM
-
LHR
2 stops24h 30m
Etihad Airways
Deal found 18/1£738
Thu 9/421:45
LHR
-
USM
2 stops38h 30m
Multiple Airlines
Sun 10/506:00
USM
-
LHR
2 stops31h 00m
Multiple Airlines
Deal found 19/1£742
Fri 18/909:30
LHR
-
USM
2 stops19h 00m
Etihad Airways
Sat 26/920:50
USM
-
LHR
2 stops27h 55m
Etihad Airways
Deal found 18/1£743
Wed 23/921:45
LHR
-
USM
2 stops17h 50m
Etihad Airways
Wed 30/917:55
USM
-
LHR
2 stops24h 50m
Etihad Airways
Deal found 18/1£743
Tue 5/509:30
LHR
-
USM
2 stops19h 45m
Etihad Airways
Sat 16/520:35
USM
-
LHR
2 stops28h 10m
Etihad Airways
Deal found 18/1£746
Sat 12/914:50
LHR
-
USM
3 stops20h 55m
Multiple Airlines
Tue 22/919:55
USM
-
LHR
2 stops21h 30m
Multiple Airlines
Deal found 19/1£747
Tue 7/418:40
LHR
-
USM
2 stops20h 30m
Multiple Airlines
Tue 28/420:35
USM
-
LHR
2 stops17h 45m
Multiple Airlines
Deal found 18/1£749
Sun 12/422:15
LHR
-
USM
2 stops27h 30m
Multiple Airlines
Sun 26/417:00
USM
-
LHR
2 stops31h 20m
Multiple Airlines
Deal found 18/1£749
Best flights from Heathrow to Ko Samui
Discover carefully curated flight deals from Heathrow to Ko Samui that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 19 January 2026.
Mon 23/314:50
LHR
-
USM
2 stops17h 50m
Multiple Airlines
Sun 17/510:05
USM
-
LHR
2 stops17h 40m
Multiple Airlines
Deal found 19/1£770
Thu 16/409:30
LHR
-
USM
2 stops30h 05m
Etihad Airways
Thu 30/418:55
USM
-
LHR
2 stops29h 50m
Etihad Airways
Deal found 17/1£772
Sun 28/622:00
LHR
-
USM
1 stop17h 10m
British Airways
Sun 19/713:30
USM
-
LHR
1 stop23h 05m
British Airways
Deal found 18/1£787
Sat 13/619:25
LHR
-
USM
1 stop16h 50m
British Airways
Sat 27/613:30
USM
-
LHR
2 stops21h 55m
British Airways
Deal found 17/1£796
Wed 3/622:00
LHR
-
USM
1 stop17h 10m
British Airways
Sat 27/613:30
USM
-
LHR
2 stops21h 55m
British Airways
Deal found 17/1£796
Fri 1/522:00
LHR
-
USM
1 stop17h 10m
British Airways
Wed 13/513:30
USM
-
LHR
2 stops21h 55m
British Airways
Deal found 19/1£796
Fri 15/519:25
LHR
-
USM
1 stop19h 45m
British Airways
Tue 26/513:30
USM
-
LHR
2 stops21h 55m
British Airways
Deal found 17/1£796
Last-minute flights from Heathrow to Ko Samui
Discover last-minute flight deals from Heathrow to Ko Samui. Data last updated 19 January 2026 and is based on user searches.
Mon 26/110:25
LHR
-
USM
2 stops23h 45m
Multiple Airlines
Sun 8/208:55
USM
-
LHR
2 stops37h 30m
Multiple Airlines
Deal found 19/1£826
Fri 30/109:30
LHR
-
USM
2 stops25h 45m
Multiple Airlines
Sun 8/217:40
USM
-
LHR
2 stops31h 55m
Multiple Airlines
Deal found 18/1£778
Wed 4/209:30
LHR
-
USM
2 stops26h 20m
Multiple Airlines
Fri 27/219:45
USM
-
LHR
2 stops41h 50m
Multiple Airlines
Deal found 17/1£734
Thu 5/222:15
LHR
-
USM
2 stops25h 50m
Multiple Airlines
Thu 5/318:15
USM
-
LHR
2 stops28h 55m
Multiple Airlines
Deal found 18/1£759
Thu 5/214:15
LHR
-
USM
2 stops23h 35m
Multiple Airlines
Sun 15/207:15
USM
-
LHR
2 stops31h 00m
Multiple Airlines
Deal found 19/1£790
Sat 7/213:55
LHR
-
USM
2 stops23h 30m
Multiple Airlines
Sun 15/220:40
USM
-
LHR
2 stops41h 00m
Multiple Airlines
Deal found 17/1£832
Mon 9/213:55
LHR
-
USM
2 stops24h 25m
Multiple Airlines
Sun 15/207:55
USM
-
LHR
2 stops59h 10m
Multiple Airlines
Deal found 17/1£802
Sun 22/209:30
LHR
-
USM
2 stops20h 15m
Multiple Airlines
Wed 11/315:35
USM
-
LHR
2 stops22h 00m
Multiple Airlines
Deal found 18/1£743
Wed 25/217:15
LHR
-
USM
2 stops36h 30m
Multiple Airlines
Sun 8/317:40
USM
-
LHR
2 stops31h 55m
Multiple Airlines
Deal found 18/1£776
Thu 26/213:30
LHR
-
USM
2 stops24h 50m
Multiple Airlines
Mon 9/314:05
USM
-
LHR
2 stops28h 00m
Multiple Airlines
Deal found 18/1£772
Fri 27/221:25
LHR
-
USM
2 stops27h 20m
Multiple Airlines
Sun 8/317:05
USM
-
LHR
2 stops29h 20m
Multiple Airlines
Deal found 17/1£806
Fri 27/221:25
LHR
-
USM
2 stops27h 20m
Multiple Airlines
Fri 13/317:05
USM
-
LHR
2 stops29h 20m
Multiple Airlines
Deal found 18/1£813
One-way flights from Heathrow to Ko Samui
Search for one-way flight options from Heathrow to Ko Samui. Find affordable one-way fares based on user searches. Data last updated 19 January 2026.
Thu 5/322:15
LHR
-
USM
2 stops35h 55m
Multiple Airlines
Deal found 18/1£362
Sun 15/310:20
LHR
-
USM
3 stops38h 40m
Multiple Airlines
Deal found 17/1£371
Mon 2/321:00
LHR
-
USM
2 stops28h 25m
Multiple Airlines
Deal found 17/1£382
Sat 11/420:50
LHR
-
USM
3 stops28h 55m
Multiple Airlines
Deal found 18/1£383
Thu 19/319:00
LHR
-
USM
2 stops40h 50m
Multiple Airlines
Deal found 17/1£386
Fri 15/522:00
LHR
-
USM
3 stops34h 45m
Multiple Airlines
Deal found 17/1£403
Tue 17/222:00
LHR
-
USM
2 stops27h 10m
Multiple Airlines
Deal found 18/1£404
Thu 26/222:15
LHR
-
USM
2 stops26h 45m
Multiple Airlines
Deal found 17/1£409
Mon 26/122:00
LHR
-
USM
2 stops26h 35m
Multiple Airlines
Deal found 16/1£409
Wed 18/322:15
LHR
-
USM
3 stops32h 35m
Multiple Airlines
Deal found 17/1£412
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 19 January 2026.
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 23/3
14:50-15:40
2 stops17h 50m
Ko Samui
Sun 17/5
10:05-21:45
2 stops17h 40m
£770
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Thu 16/4
09:30-21:35
2 stops30h 05m
Ko Samui
Thu 30/4
18:55-18:45
2 stops29h 50m
£772
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Sun 28/6
22:00-21:10
1 stop17h 10m
Ko Samui
Sun 19/7
13:30-06:35
1 stop23h 05m
£787
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Sat 13/6
19:25-18:15
1 stop16h 50m
Ko Samui
Sat 27/6
13:30-05:25
2 stops21h 55m
£796
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Wed 3/6
22:00-21:10
1 stop17h 10m
Ko Samui
Sat 27/6
13:30-05:25
2 stops21h 55m
£796
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Fri 1/5
22:00-21:10
1 stop17h 10m
Ko Samui
Wed 13/5
13:30-05:25
2 stops21h 55m
£796
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Fri 15/5
19:25-21:10
1 stop19h 45m
Ko Samui
Tue 26/5
13:30-05:25
2 stops21h 55m
£796
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Sat 11/4
20:50-07:45
3 stops28h 55m
£383
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Sun 15/3
22:15-08:00
2 stops26h 45m
£386
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Tue 17/2
22:00-08:10
2 stops27h 10m
£404
Flights are sorted by cheapest return flights first.
Deals found on 18/1
Showing 1-10 of 19 results
1
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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
Prices
Delays
More
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 16 January 2026.
The best time to book flights from London Heathrow Airport to Ko Samui is 2 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 £492). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £805). 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 19 January 2026.
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.
How often are flights from London to Ko Samui delayed?
About 8% of weekly flights between London and Ko Samui have experienced delays in the past year, with the average delay time being 159 minutes.
What is the most punctual flight time for London to Ko Samui flights?
Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Thursday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on London to Ko Samui flights?
Over the past year, Virgin Atlantic have had the lowest number of delays on this route, with just 4% of flights being delayed.
What’s the top stopover airport for flights from London Heathrow Airport to Ko Samui?
Share of one-stop return flights from London Heathrow Airport to Ko Samui chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Bangkok (BKK) – chosen by Cheapflights users on 84% of one-stop itineraries from London Heathrow Airport to Ko Samui on Cheapflights.
What’s the cheapest stopover airport for flights from London Heathrow Airport to Ko Samui?
Average return fare for one-stop flights from London Heathrow Airport to Ko Samui, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
Muscat (MCT) is the most affordable one-stop option, with an average return flight price of £530.
What’s the fastest stopover option from London Heathrow Airport to Ko Samui?
Shortest average travel time for one-stop one-way flights from London Heathrow Airport to Ko Samui, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Vienna (VIE) have the shortest average one-way travel time for one-stop routes: 13h 13m.
Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Ko Samui?
Average stopover duration for one-stop one-way flights from London Heathrow Airport to Ko Samui, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Vienna (VIE) offer the fastest connection on this route, with an average stopover time of 0h 48m.
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 19 January 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.
I like the flight attendants the most. The are very helpful.
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 10m. Fly via Etihad Airways or British Airways 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 £114, 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 £474 and £602, respectively. Bangkok Airways is currently priced 87% 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 EVA Air, with whom users have recently found tickets for as low as £497. However, be on the lookout for offers from Thai Airways and Singapore Airlines, 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 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 £21 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 £492). Flying from London Heathrow Airport to Ko Samui in December is currently the most expensive (average of £805). 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.
Explore flights to Ko Samui departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 19 January 2026.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 19 January 2026.
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 19 January 2026.
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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