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Cheap flights from Ko Samui to London from ฿17,442

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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
USM — LON
21 Aug — 28 Aug1
1 adult

Cheap flight deals from Ko Samui to London

Discover tips and strategies to find the most affordable flight options for your journey from Ko Samui (USM) to London (LON). 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 16 August 2025.

Round-trip from

฿32,485

One-way from

฿17,442

Popular in

January

Cheapest in

October

Average price

฿41,206
30/9-7/10
  • 30/9-7/10
  • 6 total stops
  • 65h 30m total
  • Ko Samui to London
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10/1
  • 10/1
  • 3 total stops
  • 34h 00m total
  • Ko Samui to London
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Highest demand for flights based on searches. 17% potential increase in price (฿277,285 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (฿87,929 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Find flight deals from Ko Samui to London

Cheapest flights from Ko Samui to London
Explore the most affordable flight options available from Ko Samui to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 August 2025.

Tue 30/919:25USM - LGW
3 stops32h 55mMultiple Airlines
Tue 7/1017:15LGW - USM
3 stops32h 35mMultiple Airlines
Deal found 15/8฿32,485
Tue 30/908:45USM - LHR
2 stops28h 15mMultiple Airlines
Tue 7/1009:30LHR - USM
2 stops25h 15mMultiple Airlines
Deal found 15/8฿32,550
Mon 22/908:45USM - LCY
2 stops30h 05mสวิส อินเตอร์เนชั่นแนล แอร์ไลน์
Tue 23/913:05LCY - USM
2 stops18h 40mสวิส อินเตอร์เนชั่นแนล แอร์ไลน์
Deal found 13/8฿34,203
Tue 23/908:45USM - LCY
2 stops30h 05mสวิส อินเตอร์เนชั่นแนล แอร์ไลน์
Wed 24/913:05LCY - USM
2 stops18h 40mสวิส อินเตอร์เนชั่นแนล แอร์ไลน์
Deal found 13/8฿35,208
Tue 30/908:20USM - LGW
2 stops35h 05mQatar Airways
Tue 7/1014:55LGW - USM
2 stops24h 15mQatar Airways
Deal found 15/8฿35,500
Tue 30/908:45USM - LHR
1 stop16h 35mEVA Air
Tue 7/1021:35LHR - USM
1 stop14h 55mEVA Air
Deal found 15/8฿38,710
Sun 21/909:15USM - LCY
2 stops28h 20mสวิส อินเตอร์เนชั่นแนล แอร์ไลน์
Mon 22/913:05LCY - USM
2 stops17h 40mสวิส อินเตอร์เนชั่นแนล แอร์ไลน์
Deal found 13/8฿42,211
Thu 28/808:45USM - LGW
3 stops31h 45mMultiple Airlines
Tue 23/918:15LGW - USM
3 stops42h 15mMultiple Airlines
Deal found 15/8฿43,540
Thu 28/808:45USM - LGW
3 stops31h 45mMultiple Airlines
Mon 22/920:10LGW - USM
3 stops29h 40mMultiple Airlines
Deal found 15/8฿43,962
Thu 28/808:45USM - LGW
3 stops31h 45mMultiple Airlines
Sun 21/911:25LGW - USM
2 stops25h 05mMultiple Airlines
Deal found 15/8฿45,777
Thu 28/808:45USM - LGW
2 stops28h 10mMultiple Airlines
Thu 18/912:35LGW - USM
2 stops25h 50mMultiple Airlines
Deal found 15/8฿45,907
Thu 28/808:45USM - LGW
2 stops28h 10mMultiple Airlines
Wed 24/911:25LGW - USM
2 stops21h 45mMultiple Airlines
Deal found 15/8฿46,718

Cheapflights Fare Finder

 
Customise your flight search to find flights from Ko Samui to London 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 17,341 searches. Data last updated 16 August 2025.
Use the filters below to find and compare flights from Ko Samui to London that are best for you.

Fly from

Ko Samui

Fly to

London

Route

Depart

Return

Price

Ko SamuiLondon

USM - LGW

USMLGW

Ko Samui

Tue 30/9

19:25-22:20

3 stops32h 55m

London Gatwick

Tue 7/10

17:15-07:50

3 stops32h 35m

฿32,485

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Tue 30/9

08:45-07:00

2 stops28h 15m

London Heathrow

Tue 7/10

09:30-16:45

2 stops25h 15m

฿32,550

Ko SamuiLondon

USM - LCY

USMLCY

Ko Samui

Mon 22/9

08:45-08:50

2 stops30h 05m

London City

Tue 23/9

13:05-13:45

2 stops18h 40m

฿34,203

Ko SamuiLondon

USM - LCY

USMLCY

Ko Samui

Tue 23/9

08:45-08:50

2 stops30h 05m

London City

Wed 24/9

13:05-13:45

2 stops18h 40m

฿35,208

Ko SamuiLondon

USM - LGW

USMLGW

Ko Samui

Tue 30/9

08:20-13:25

2 stops35h 05m

London Gatwick

Tue 7/10

14:55-21:10

2 stops24h 15m

฿35,500

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Tue 30/9

08:45-19:20

1 stop16h 35m

London Heathrow

Tue 7/10

21:35-18:30

1 stop14h 55m

฿38,710

Ko SamuiLondon

USM - LCY

USMLCY

Ko Samui

Sun 21/9

09:15-07:35

2 stops28h 20m

London City

Mon 22/9

13:05-12:45

2 stops17h 40m

฿42,211

Ko SamuiLondon

USM - LGW

USMLGW

Ko Samui

Thu 28/8

08:45-10:30

3 stops31h 45m

London Gatwick

Tue 23/9

18:15-18:30

3 stops42h 15m

฿43,540

Ko SamuiLondon

USM - LGW

USMLGW

Ko Samui

Thu 28/8

08:45-10:30

3 stops31h 45m

London Gatwick

Mon 22/9

20:10-07:50

3 stops29h 40m

฿43,962

Ko SamuiLondon

USM - LGW

USMLGW

Ko Samui

Thu 28/8

08:45-10:30

3 stops31h 45m

London Gatwick

Wed 24/9

11:25-18:30

2 stops25h 05m

฿45,777

Flights are sorted by cheapest return flights first.

Deals found on 14/8

Showing 1-10 of 46 results
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Best time to book a flight from Ko Samui to London

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

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

Share of one-stop return flights from Ko Samui to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Singapore (SIN) – chosen by Cheapflights users on 75% of one-stop itineraries from Ko Samui to London on Cheapflights.

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

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

Singapore (SIN) is the most affordable one-stop option, with an average return flight price of ฿41,747.

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

Shortest average travel time for one-stop one-way flights from Ko Samui to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Bangkok (BKK) have the shortest average one-way travel time for one-stop routes: 16h 35m.

Which airport typically offers the quickest stopover for flights from Ko Samui to London?

Average stopover duration for one-stop one-way flights from Ko Samui to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Bangkok (BKK) offer the fastest connection on this route, with an average stopover time of 3h 20m.

Related info for your journey

Find useful and relevant information for your journey from Ko Samui to London. 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 from for flights from Ko Samui to London?

    For a flight from Ko Samui to London, you will be flying from Ko Samui. Ko Samui (USM) is just 3.3 km from the centre of the city. Ko Samui is the only Ko Samui airport and it handles 0 outbound flights to London per day. 0 airlines have flights to London from Ko Samui on a regular basis.

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

    When deciding which route to take from Ko Samui to London, consider Ko Samui - London City, Ko Samui - London Gatwick or Ko Samui - London Heathrow, as they are the most popular.

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

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

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

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

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

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

    Currently, December is the cheapest month in which you can book a flight from Ko Samui to London (average of ฿810). Flying from Ko Samui to London in July is currently the most expensive (average of ฿1,019). 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

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

Cheapflights helps you find that perfect flight to London from Ko Samui by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ko Samui to London with no change fees?

Certainly. Search results for flights to London from Ko Samui shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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