Cheap flights from London Heathrow Airport to Ko Samui from £319
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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — USM
4 Jan — 11 Jan1
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 85 days in advance, depart on a Wednesday or Monday and return on a Friday
Cheap 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 5 December 2025.
Mon 8/1208:55LHR - USM
2 stops21h 10mMultiple Airlines
Wed 4/311:40USM - LHR
2 stops27h 15mMultiple Airlines
Deal found 2/12£772
Wed 10/1208:40LHR - USM
2 stops16h 45mQatar Airways
Wed 24/1215:50USM - LHR
2 stops21h 05mQatar Airways
Deal found 2/12£812
Sun 7/1216:00LHR - USM
2 stops21h 50mMultiple Airlines
Sat 20/1215:05USM - LHR
3 stops33h 25mMultiple Airlines
Deal found 2/12£824
Wed 10/1213:45LHR - USM
2 stops17h 05mMultiple Airlines
Fri 19/1221:10USM - LHR
2 stops31h 30mMultiple Airlines
Deal found 2/12£842
Sat 6/1220:15LHR - USM
2 stops36h 20mMultiple Airlines
Thu 26/216:30USM - LHR
2 stops21h 00mMultiple Airlines
Deal found 2/12£847
Tue 30/1222:05LHR - USM
2 stops26h 10mMultiple Airlines
Wed 14/116:30USM - LHR
2 stops29h 30mMultiple Airlines
Deal found 2/12£889
Thu 11/1206:00LHR - USM
2 stops26h 35mMultiple Airlines
Tue 23/1209:20USM - LHR
2 stops19h 20mMultiple Airlines
Deal found 3/12£933
Mon 8/1215:30LHR - USM
2 stops19h 20mQatar Airways
Wed 4/311:40USM - LHR
2 stops25h 45mQatar Airways
Deal found 2/12£935
Sun 14/1213:20LHR - USM
3 stops35h 40mMultiple Airlines
Thu 25/1214:20USM - LHR
3 stops34h 10mMultiple Airlines
Deal found 4/12£941
Wed 10/1211:00LHR - USM
1 stop25h 35mCathay Pacific
Wed 24/1207:55USM - LHR
2 stops29h 35mCathay Pacific
Deal found 2/12£950
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 5 December 2025.
Sat 30/509:30LHR - USM
2 stops30h 05mEtihad Airways
Sun 21/617:55USM - LHR
2 stops19h 05mEtihad Airways
Deal found 4/12£771
Wed 6/521:35LHR - USM
1 stop16h 55mEVA Air
Thu 28/509:15USM - LHR
1 stop16h 05mEVA Air
Deal found 4/12£878
Wed 21/117:50LHR - USM
1 stop18h 45mCathay Pacific
Mon 26/111:40USM - LHR
1 stop34h 20mCathay Pacific
Deal found 4/12£893
Fri 15/509:25LHR - USM
2 stops19h 40mMultiple Airlines
Tue 26/516:25USM - LHR
1 stop33h 05mMultiple Airlines
Deal found 2/12£901
Mon 19/117:50LHR - USM
1 stop18h 45mCathay Pacific
Fri 23/111:40USM - LHR
1 stop34h 20mCathay Pacific
Deal found 4/12£893
Thu 9/411:25LHR - USM
1 stop27h 45mMultiple Airlines
Sun 10/516:25USM - LHR
1 stop33h 05mMultiple Airlines
Deal found 4/12£905
Mon 19/117:50LHR - USM
1 stop18h 45mCathay Pacific
Thu 22/111:40USM - LHR
1 stop36h 40mCathay Pacific
Deal found 4/12£893
Thu 23/411:25LHR - USM
1 stop27h 45mMultiple Airlines
Sun 10/516:25USM - LHR
1 stop33h 05mMultiple Airlines
Deal found 3/12£905
Sat 17/122:05LHR - USM
1 stop38h 30mCathay Pacific
Mon 26/111:40USM - LHR
1 stop34h 20mCathay Pacific
Deal found 4/12£908
Sat 17/122:05LHR - USM
1 stop38h 30mCathay Pacific
Wed 28/111:40USM - LHR
1 stop34h 20mCathay Pacific
Deal found 4/12£908
Last-minute flights from Heathrow to Ko Samui
Discover last-minute flight deals from Heathrow to Ko Samui. Data last updated 5 December 2025 and is based on user searches.
Tue 6/121:00LHR - USM
2 stops28h 25mMultiple Airlines
Tue 27/119:00USM - LHR
2 stops29h 30mMultiple Airlines
Deal found 4/12£782
Sat 10/121:00LHR - USM
2 stops28h 25mMultiple Airlines
Sat 7/319:00USM - LHR
2 stops29h 30mMultiple Airlines
Deal found 4/12£805
Sun 11/120:55LHR - USM
2 stops27h 50mEtihad Airways
Sat 24/108:15USM - LHR
2 stops34h 50mEtihad Airways
Deal found 4/12£811
Sun 11/117:50LHR - USM
2 stops30h 55mMultiple Airlines
Sat 24/114:30USM - LHR
2 stops21h 55mMultiple Airlines
Deal found 3/12£827
Tue 13/121:00LHR - USM
2 stops28h 25mMultiple Airlines
Tue 27/109:00USM - LHR
3 stops29h 20mMultiple Airlines
Deal found 3/12£819
Sat 17/109:00LHR - USM
2 stops26h 15mMultiple Airlines
Sat 24/111:40USM - LHR
2 stops27h 15mMultiple Airlines
Deal found 3/12£793
Mon 19/109:05LHR - USM
2 stops23h 35mMultiple Airlines
Mon 2/208:55USM - LHR
2 stops30h 50mMultiple Airlines
Deal found 4/12£776
Mon 19/121:50LHR - USM
2 stops31h 45mMultiple Airlines
Sat 24/108:15USM - LHR
2 stops29h 20mMultiple Airlines
Deal found 4/12£776
Mon 19/121:50LHR - USM
2 stops31h 45mMultiple Airlines
Sun 25/121:10USM - LHR
2 stops26h 50mMultiple Airlines
Deal found 4/12£779
Mon 19/120:55LHR - USM
2 stops38h 20mEtihad Airways
Mon 26/108:50USM - LHR
2 stops40h 20mEtihad Airways
Deal found 4/12£791
Thu 22/120:15LHR - USM
2 stops28h 30mMultiple Airlines
Sun 1/216:30USM - LHR
2 stops21h 00mMultiple Airlines
Deal found 3/12£814
Fri 23/122:00LHR - USM
2 stops26h 35mMultiple Airlines
Fri 30/115:50USM - LHR
3 stops36h 25mMultiple Airlines
Deal found 4/12£810
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 5 December 2025.
Wed 4/319:50LHR - USM
2 stops52h 20mMultiple Airlines
Deal found 2/12£319
Sat 21/317:30LHR - USM
2 stops44h 00mMultiple Airlines
Deal found 3/12£358
Thu 15/121:00LHR - USM
2 stops28h 25mMultiple Airlines
Deal found 4/12£380
Fri 20/219:20LHR - USM
2 stops29h 25mEtihad Airways
Deal found 2/12£405
Sun 11/121:00LHR - USM
2 stops27h 45mMultiple Airlines
Deal found 4/12£419
Mon 19/110:25LHR - USM
2 stops22h 10mMultiple Airlines
Deal found 2/12£439
Fri 20/221:10LHR - USM
3 stops34h 35mMultiple Airlines
Deal found 2/12£444
Sun 4/120:25LHR - USM
2 stops28h 05mMultiple Airlines
Deal found 4/12£453
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 5 December 2025.
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 5 December 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
Sat 30/5
09:30-21:35
2 stops30h 05m
Ko Samui
Sun 21/6
17:55-07:00
2 stops19h 05m
£771
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Wed 6/5
21:35-20:30
1 stop16h 55m
Ko Samui
Thu 28/5
09:15-19:20
1 stop16h 05m
£878
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Wed 21/1
17:50-19:35
1 stop18h 45m
Ko Samui
Mon 26/1
11:40-15:00
1 stop34h 20m
£893
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Mon 19/1
17:50-19:35
1 stop18h 45m
Ko Samui
Fri 23/1
11:40-15:00
1 stop34h 20m
£893
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Mon 19/1
17:50-19:35
1 stop18h 45m
Ko Samui
Thu 22/1
11:40-17:20
1 stop36h 40m
£893
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Fri 15/5
09:25-11:05
2 stops19h 40m
Ko Samui
Tue 26/5
16:25-19:30
1 stop33h 05m
£901
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Thu 9/4
11:25-21:10
1 stop27h 45m
Ko Samui
Sun 10/5
16:25-19:30
1 stop33h 05m
£905
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Thu 23/4
11:25-21:10
1 stop27h 45m
Ko Samui
Sun 10/5
16:25-19:30
1 stop33h 05m
£905
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Sat 17/1
22:05-19:35
1 stop38h 30m
Ko Samui
Mon 26/1
11:40-15:00
1 stop34h 20m
£908
LondonKo Samui
LHR - USM
LHRUSM
London Heathrow
Sat 17/1
22:05-19:35
1 stop38h 30m
Ko Samui
Wed 28/1
11:40-15:00
1 stop34h 20m
£908
Flights are sorted by cheapest return flights first.
Deals found on 3/12
Showing 1-10 of 18 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
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 28 November 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 £852). 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 5 December 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.
How often are flights from London to Ko Samui delayed?
About 9% of weekly flights between London and Ko Samui have experienced delays in the past year, with the average delay time being 164 minutes.
What is the most punctual flight time for London to Ko Samui flights?
Historically, flights departing at night 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?
Saturday 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 5% 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 81% 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.
Mumbai (BOM) is the most affordable one-stop option, with an average return flight price of £537.
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 5 December 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.
All was okay except for the medical emergency that happened before our boarding. I wish that the medical emergency response was more immediate.
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 16h 55m. Fly via Etihad Airways, EVA Air, or Cathay Pacific 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 £413 and £604, 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 £498. 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 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 £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, 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 £852). 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 5 December 2025.
Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 5 December 2025.
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 5 December 2025.
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.
We value your privacy
Cheapflights and its partners wish to use cookies or similar technologies to store and/or access information on and about your device and process personal data such as your IP address, device identifiers etc., in order to improve your experience on the site, to analyse navigation, to offer and measure personalised advertising, and to facilitate sharing on social networks. We also allow the use of third-party cookies (including those from our advertising partners) on our sites.
By clicking 'Accept', you consent to your data being processed by 0 vendors on this web site for the purposes described in this notice. You can review the vendors and their individual processing purposes on the .
To review individual processing purposes and cookie categories, please click ’Select individual purposes’. You can review your choices and withdraw your consent at any time by clicking the ’Privacy Preferences’ link in the page side navigation.