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Cheap flights from London to Ko Samui from £309

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 21/4. Fares are subject to change and may not be available on all flights or dates of travel.
LON — USM
7 May — 14 May1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Ko Samui are usually found in November or September, booked 89 days in advance, depart on a Wednesday or Tuesday and return on a Friday

Cheap flight deals from London to Ko Samui

Enter your travel dates to find the best prices.

Cheapest flights from London to Ko Samui
Explore the most affordable flight options available from London to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 April 2026.

Wed 24/608:10
LGW
-
USM
2 stops23h 45m
Multiple Airlines
Sun 5/715:25
USM
-
LGW
2 stops21h 15m
Multiple Airlines
Deal found 7/4£766
Sat 9/506:00
LGW
-
USM
3 stops21h 20m
Multiple Airlines
Tue 19/506:00
USM
-
LGW
3 stops35h 30m
Multiple Airlines
Deal found 7/4£770
Sat 30/509:15
LGW
-
USM
2 stops29h 10m
Multiple Airlines
Sat 27/615:25
USM
-
LGW
2 stops21h 15m
Multiple Airlines
Deal found 3/4£771
Tue 26/521:45
LHR
-
USM
2 stops17h 50m
Etihad Airways
Sat 27/617:55
USM
-
LHR
2 stops24h 50m
Etihad Airways
Deal found 7/4£772
Tue 5/521:45
LHR
-
USM
2 stops17h 50m
Etihad Airways
Sat 16/519:00
USM
-
LHR
2 stops23h 45m
Etihad Airways
Deal found 6/4£772
Sat 9/517:35
LGW
-
USM
3 stops22h 00m
Multiple Airlines
Sat 23/515:30
USM
-
LGW
2 stops21h 25m
Multiple Airlines
Deal found 7/4£773
Thu 30/421:10
LHR
-
USM
2 stops29h 15m
Etihad Airways
Fri 15/519:45
USM
-
LHR
2 stops23h 00m
Etihad Airways
Deal found 6/4£773
Thu 16/409:15
LHR
-
USM
2 stops19h 15m
Etihad Airways
Thu 30/418:25
USM
-
LHR
2 stops26h 40m
Etihad Airways
Deal found 4/4£774
Tue 16/609:30
LHR
-
USM
2 stops17h 50m
Etihad Airways
Wed 24/619:45
USM
-
LHR
2 stops23h 00m
Etihad Airways
Deal found 3/4£775
Tue 25/818:40
LHR
-
USM
2 stops20h 30m
SWISS
Tue 6/1009:15
USM
-
LHR
2 stops18h 30m
SWISS
Deal found 6/4£776
Sun 14/621:45
LHR
-
USM
2 stops28h 30m
Etihad Airways
Sun 12/706:00
USM
-
LHR
2 stops18h 45m
Etihad Airways
Deal found 6/4£777
Mon 2/1111:20
LGW
-
USM
1 stop15h 00m
Multiple Airlines
Mon 16/1110:00
USM
-
LGW
1 stop34h 45m
Multiple Airlines
Deal found 5/4£778

Find flight deals from London to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) 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 7 April 2026.

Round-trip from

£771

One-way from

£309

Popular in

December

Cheapest in

November

Average price

£922
30/5-27/6
  • 30/5-27/6
  • 4 total stops
  • 50h 25m total
  • London to Ko Samui
Search Deals
21/4
  • 21/4
  • 2 total stops
  • 43h 10m total
  • London to Ko Samui
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£60 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London 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 7 April 2026.
Use the filters below to find and compare flights from London to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 11/5

09:30-10:45

2 stops19h 15m

Ko Samui

Tue 19/5

06:00-18:45

2 stops18h 45m

£786

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 13/5

09:30-10:45

2 stops19h 15m

Ko Samui

Thu 21/5

20:50-12:45

2 stops21h 55m

£786

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 13/5

09:30-10:45

2 stops19h 15m

Ko Samui

Mon 25/5

21:00-12:45

2 stops21h 45m

£786

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 17/5

09:30-11:05

2 stops19h 35m

Ko Samui

Sun 24/5

19:00-12:45

2 stops23h 45m

£788

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Fri 19/6

14:45-15:10

2 stops18h 25m

Ko Samui

Sun 28/6

21:00-12:45

2 stops21h 45m

£788

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 10/5

20:45-21:35

2 stops18h 50m

Ko Samui

Thu 14/5

06:00-18:45

2 stops18h 45m

£796

LondonKo Samui

LGW - USM

LGWUSM

London Gatwick

Thu 4/6

09:15-11:05

2 stops19h 50m

Ko Samui

Tue 16/6

14:30-06:40

2 stops22h 10m

£808

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 21/4

20:45-21:35

2 stops18h 50m

Ko Samui

Fri 24/4

17:55-13:30

2 stops25h 35m

£813

LondonKo Samui

LTN - USM

LTNUSM

London Luton

Fri 22/5

06:20-14:40

3 stops26h 20m

Ko Samui

Fri 29/5

06:00-22:10

3 stops22h 10m

£825

LondonKo Samui

LTN - USM

LTNUSM

London Luton

Mon 4/5

08:20-12:45

3 stops22h 25m

Ko Samui

Mon 11/5

06:00-14:35

3 stops38h 35m

£837

Flights are sorted by cheapest return flights first.

Deals found on 4/4

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from London to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from London 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 to Ko Samui

How far ahead should I book a flight from London to Ko Samui?

Use this chart to determine the optimal time to book a return flight from London to Ko Samui. Price data was last updated on 3 April 2026.

The best time to book flights from London to Ko Samui is 89 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 to Ko Samui?

Currently, January is the cheapest month in which you can book a flight from London to Ko Samui (average of £262). Flying from London to Ko Samui in September is currently the most expensive (average of £702). 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 LON to USM?

Find hourly flight availability from London 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 7 April 2026.

It’s optimal to fly from London to Ko Samui at midday. By choosing this option you can save up to 27% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from London to Ko Samui?

Use this chart to determine the cheapest time to fly return from London to Ko Samui. Price data was last updated on 30 March 2025.

Travellers seeking maximum savings on their London to Ko Samui flight should consider departing on Wednesday at midday when fares are most often at their lowest. Tuesday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost for a return flight from London to Ko Samui?

What’s the top stopover airport for flights from London to Ko Samui?

Share of one-stop return flights from London 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 79% of one-stop itineraries from London to Ko Samui on Cheapflights.

What’s the cheapest stopover airport for flights from London to Ko Samui?

Average return fare for one-stop flights from London to Ko Samui, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Shanghai (PVG) is the most affordable one-stop option, with an average return flight price of £422.

What’s the fastest stopover option from London to Ko Samui?

Shortest average travel time for one-stop one-way flights from London 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 to Ko Samui?

Average stopover duration for one-stop one-way flights from London 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.

How often are flights from London to Ko Samui delayed?

About 10% of weekly flights between London and Ko Samui have experienced delays in the past year, with the average delay time being 161 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?

Wednesday 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.

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 7 April 2026.
Check out reviews from past customers who have flown with EVA Air,Singapore Airlines, andThai Airways from London to Ko Samui to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.5
Very Good
1,401 reviews
Check prices

Comfort

8.3

Boarding

8.4

Entertainment

8.0

Overall

8.5

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
EVA Air
8.5
Very Good
1,401 reviews
EVA Air
8.5
Very Good
1,401 reviews
Check prices

Comfort

8.3

Boarding

8.4

Entertainment

8.0

Overall

8.5

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
Singapore Airlines
8.2
Very Good
1,490 reviews
EVA Air
8.5
Very Good
1,401 reviews
Check prices

Comfort

8.3

Boarding

8.4

Entertainment

8.0

Overall

8.5

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
Thai Airways
7.8
Good
396 reviews
EVA Air
8.5
Very Good
1,401 reviews
Check prices

Comfort

8.3

Boarding

8.4

Entertainment

8.0

Overall

8.5

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
Qatar Airways
7.4
Good
3,729 reviews
EVA Air
8.5
Very Good
1,401 reviews
Check prices

Comfort

8.3

Boarding

8.4

Entertainment

8.0

Overall

8.5

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
British Airways
6.7
Okay
7,859 reviews
EVA Air
8.5
Very Good
1,401 reviews
Check prices

Comfort

8.3

Boarding

8.4

Entertainment

8.0

Overall

8.5

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?

Related info for your journey

Find useful and relevant information for your journey from London 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?

    Most people fly into Ko Samui (USM) if they book a flight to Ko Samui from London. On average, Ko Samui has 0 inbound flights from London per day from 14 airlines. Ko Samui is conveniently located just 2.1 mi from Ko Samui’s city center.

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

    Departing from London to Ko Samui will take you 17h 50m. The distance between London and Ko Samui is about 6144 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    According to our current data, Bangkok Airways (£115), Air India (£440), and Etihad Airways (£445) offers the cheapest pricing from London to Ko Samui. Users have found that Bangkok Airways is 87% cheaper than the other options available to this destination.

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

    The cheapest airline one-way is EVA Air, with whom users have recently found tickets for as low as £481. However, be on the lookout for offers from Thai Airways and Singapore Airlines, as they are both options that can get you from London to Ko Samui for a low price.

  • What are the most popular routes from London to Ko Samui?

    The most popular route from London to Ko Samui is London Heathrow - Ko Samui. You may also consider London Gatwick - Ko Samui or London Stansted - Ko Samui.

  • Where are the most common stopover locations when flying from London to Ko Samui?

    The most popular stopover on flights from London to Ko Samui is Bangkok.

  • What are some popular things to do or see while on a stopover in Bangkok?

    Pratunam, Siam Square, and Thailand Cultural Center are currently the most popular points of interest in Bangkok at the moment. Pratunam, Siam Square, and Thailand Cultural Center are located about 14.8 mi, 15.1 mi, and 13.1 mi, respectively from Bangkok Suvarnabhumi. Travellers in need of a car in Bangkok can hire one for about £17 per day.

  • Where are the least popular stopover locations for London to Ko Samui flights?

    London to Ko Samui flights have a stopover in Singapore the least frequently.

  • Can I find deals for flights from London to Ko Samui that include hotel bookings?

    Yes. In addition to deals on London to Ko Samui flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Ko Samui?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Ko Samui.

  • Can I find deals for business class flights from London to Ko Samui?

    Yes. Cheapflights offers flight deals from London 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 to Ko Samui?

    Currently, January is the cheapest month in which you can book a flight from London to Ko Samui (average of £262). Flying from London to Ko Samui in September is currently the most expensive (average of £702). 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
Khanom

Browse thousands of different options on Cheapflights for your next trip

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Fly from London to Ko Samui on these airlines

Choose from the following airlines for your flight from London to Ko Samui. Flights are based on user searches made on Cheapflights and were last updated on 7 April 2026.
EVA Air flights from London to Ko Samui
Thai Airways flights from London to Ko Samui
Etihad Airways flights from London to Ko Samui

Top 10 airlines flying from London to Ko Samui

Discover the top 10 airlines that operate flights from London 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 7 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Bangkok AirwaysCheapest£115Average£144FlexibilityNo cancel feeOn-time74%
Search Bangkok Airways flights
Air IndiaCheapest£440Average£498FlexibilityNo cancel feeOn-timeN/A
Search Air India flights
Etihad AirwaysCheapest£445Average£786FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Austrian AirlinesCheapest£599Average£693FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£610Average£710FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
SWISSCheapest£614Average£704FlexibilityNo cancel feeOn-time79%
Search SWISS flights
KLMCheapest£643Average£779FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air FranceCheapest£669Average£739FlexibilityNo cancel feeOn-time77%
Search Air France flights
EVA AirCheapest£734Average£842FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
British AirwaysCheapest£738Average£1,109FlexibilityNo 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 London to Ko Samui?

When you search for this flight from London to Ko Samui, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from London to Ko Samui?

Cheapflights simply makes it quick and affordable to book flights from London 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 London to Ko Samui with no change fees?

Need flexible booking options for your flight to Ko Samui from London? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from London to Ko Samui become cheaper?

Not ready to book yet? You can track prices for flights from London to Ko Samui on Cheapflights with our Price Alert feature and get notified when better prices are available.

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