How long is the flight from Ko Samui to London?

Gulf Air, Emirates, and SWISS can get you from Ko Samui to London in just under 20h 55m. Your travel time can differ by up to 7h 45m. Ko Samui and London are separated by a distance of 6138 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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.

What is the cheapest time of day to fly from USM to LON?

When flying from Ko Samui to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What airport do you fly from for flights from Ko Samui to London?

If you book a flight to London from Ko Samui, you will be flying from Ko Samui, which is the city’s only airport. Ko Samui (USM) is located 2.1 mi from the center of Ko Samui. There are 0 flights from Ko Samui to London per day from 0 different airlines.

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.

£263+ Cheap Flights from Ko Samui to London

Cheap flight deals from Ko Samui to London

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 21 August 2026.

Tue 10/1121:30 -

1 stop25h 05m

Mon 16/1109:50 -

2 stops23h 35m

Deal found 17/8£597

Sat 3/1008:40 -

2 stops28h 15m

Sat 10/1018:00 -

3 stops31h 45m

Deal found 19/8£720

Sun 20/908:40 -

2 stops34h 05m

Sun 4/1009:30 -

2 stops25h 50m

Deal found 17/8£728

Tue 15/911:05 -

2 stops34h 00m

Tue 22/909:30 -

2 stops25h 50m

Deal found 18/8£743

Sun 20/906:00 -

2 stops31h 30m

Sat 3/1016:15 -

2 stops22h 35m

Deal found 17/8£758

Wed 30/911:05 -

2 stops25h 35m

Wed 7/1005:20 -

3 stops31h 30m

Deal found 16/8£760

Wed 16/911:05 -

2 stops31h 40m

Wed 23/909:30 -

2 stops27h 20m

Deal found 17/8£777

Tue 10/1112:00 -

3 stops35h 20m

Mon 16/1121:00 -

2 stops27h 10m

Deal found 17/8£787

Sun 20/908:40 -

2 stops28h 00m

Sat 3/1009:00 -

2 stops26h 20m

Deal found 20/8£787

Sun 20/908:40 -

2 stops28h 00m

Sun 4/1010:40 -

2 stops24h 40m

Deal found 17/8£791

Sat 19/908:40 -

2 stops28h 15m

Mon 21/906:55 -

3 stops28h 25m

Deal found 19/8£802

Sat 19/908:40 -

2 stops29h 20m

Mon 21/910:00 -

2 stops21h 45m

Deal found 19/8£804

Best flights from Ko Samui to London
Discover carefully curated flight deals from Ko Samui to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Sun 20/908:40 -

2 stops34h 05m

Sun 4/1009:30 -

2 stops25h 50m

Deal found 17/8£728

Tue 15/915:20 -

2 stops21h 35m

Tue 6/1022:05 -

2 stops34h 40m

Deal found 17/8£815

Tue 15/913:50 -

2 stops35h 20m

Tue 6/1020:50 -

2 stops33h 05m

Deal found 19/8£834

Wed 16/916:25 -

2 stops20h 55m

Sun 20/909:05 -

2 stops30h 05m

Deal found 18/8£848

Sat 19/914:30 -

2 stops22h 10m

Mon 21/909:00 -

2 stops19h 30m

Deal found 19/8£933

Tue 10/1112:00 -

1 stop28h 05m

Mon 16/1113:05 -

1 stop22h 45m

Deal found 17/8£976

Sun 20/919:15 -

1 stop16h 40m

Sat 3/1022:15 -

1 stop16h 15m

Deal found 20/8£1,079

Sun 20/908:45 -

2 stops28h 40m

Sat 3/1012:15 -

2 stops19h 30m

Deal found 17/8£1,080

Tue 15/911:05 -

2 stops34h 00m

Tue 22/909:30 -

2 stops25h 50m

Deal found 18/8£743

Wed 30/911:05 -

2 stops25h 35m

Wed 7/1005:20 -

3 stops31h 30m

Deal found 16/8£760

Tue 15/916:25 -

2 stops26h 10m

Tue 22/909:05 -

2 stops30h 05m

Deal found 16/8£906

Sat 5/916:25 -

2 stops26h 50m

Mon 28/917:10 -

2 stops19h 05m

Deal found 17/8£1,850

Tue 10/1108:55 -

3 stops28h 00m

Mon 16/1108:35 -

3 stops27h 15m

Deal found 17/8£783

Sun 20/908:40 -

2 stops28h 00m

Sat 3/1012:05 -

3 stops24h 45m

Deal found 17/8£798

Sun 20/909:15 -

2 stops28h 10m

Sun 4/1014:20 -

2 stops16h 25m

Deal found 17/8£1,083

Sat 19/908:40 -

2 stops28h 15m

Mon 21/906:55 -

3 stops28h 25m

Deal found 19/8£802

Sat 19/908:40 -

2 stops29h 20m

Mon 21/910:00 -

2 stops21h 45m

Deal found 19/8£804

Wed 16/909:15 -

2 stops29h 25m

Wed 23/913:10 -

2 stops18h 35m

Deal found 17/8£1,274

Sun 20/908:40 -

2 stops27h 45m

Sat 3/1017:00 -

2 stops19h 50m

Deal found 20/8£818

Wed 30/911:05 -

2 stops25h 55m

Wed 7/1009:30 -

2 stops23h 15m

Deal found 16/8£826

Sat 5/919:45 -

2 stops30h 40m

Mon 28/910:00 -

2 stops23h 25m

Deal found 17/8£845

Sat 19/916:25 -

2 stops26h 50m

Mon 21/910:00 -

2 stops20h 45m

Deal found 19/8£1,919

Wed 30/916:25 -

2 stops22h 15m

Wed 7/1013:10 -

2 stops17h 35m

Deal found 16/8£1,086

Sun 20/908:40 -

3 stops30h 50m

Sun 4/1017:50 -

3 stops34h 20m

Deal found 17/8£1,255

Find flight deals from Ko Samui to London

Round-trip from	£597
One-way from	£263
Popular in	April
Cheapest in	August
Average price	£505

10/11-16/11
3 total stops
48h 40m total
Ko Samui to London

Search Deals

18/12
1 total stop
35h 50m total
Ko Samui to London

Search Deals

Highest demand for flights based on searches. 14% potential increase in price (£130 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 7% potential price decrease (£56 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Sun 20/9

08:40-12:45

2 stops34h 05m

London Heathrow

Sun 4/10

09:30-17:20

2 stops25h 50m

£728

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 15/9

11:05-15:05

2 stops34h 00m

London Heathrow

Tue 22/9

09:30-17:20

2 stops25h 50m

£743

Ko SamuiLondon

USM Ko Samui - LGW London Gatwick

USMLGW

Ko Samui

Wed 30/9

11:05-06:40

2 stops25h 35m

London Gatwick

Wed 7/10

05:20-18:50

3 stops31h 30m

£760

Ko SamuiLondon

USM Ko Samui - LGW London Gatwick

USMLGW

Ko Samui

Tue 10/11

08:55-05:55

3 stops28h 00m

London Gatwick

Mon 16/11

08:35-18:50

3 stops27h 15m

£783

Ko SamuiLondon

USM Ko Samui - LGW London Gatwick

USMLGW

Ko Samui

Sun 20/9

08:40-06:40

2 stops28h 00m

London Gatwick

Sat 3/10

12:05-18:50

3 stops24h 45m

£798

Ko SamuiLondon

USM Ko Samui - LGW London Gatwick

USMLGW

Ko Samui

Sat 19/9

08:40-06:55

2 stops28h 15m

London Gatwick

Mon 21/9

06:55-17:20

3 stops28h 25m

£802

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Sat 19/9

08:40-08:00

2 stops29h 20m

London Heathrow

Mon 21/9

10:00-13:45

2 stops21h 45m

£804

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 15/9

15:20-06:55

2 stops21h 35m

London Heathrow

Tue 6/10

22:05-14:45

2 stops34h 40m

£815

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Sun 20/9

08:40-06:25

2 stops27h 45m

London Heathrow

Sat 3/10

17:00-18:50

2 stops19h 50m

£818

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Wed 30/9

11:05-07:00

2 stops25h 55m

London Heathrow

Wed 7/10

09:30-14:45

2 stops23h 15m

£826

Flights are sorted by cheapest return flights first.

Deals found on 17/8

Showing 1-10 of 54 resultsSorted by cheapest first

...

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.

USM-LON

USM-LGW

USM-LHR

USM-LCY

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

USM-LON

USM-LGW

USM-LHR

USM-LCY

No data available for this route at this time. Please check back soon.

Related info for your journey

What airport do you fly from for flights from Ko Samui to London?
If you book a flight to London from Ko Samui, you will be flying from Ko Samui, which is the city’s only airport. Ko Samui (USM) is located 2.1 mi from the center of Ko Samui. There are 0 flights from Ko Samui to London per day from 0 different airlines.
How long is the flight from Ko Samui to London?
Gulf Air, Emirates, and SWISS can get you from Ko Samui to London in just under 20h 55m. Your travel time can differ by up to 7h 45m. Ko Samui and London are separated by a distance of 6138 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
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.

See more FAQs

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Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ko Samui to London. 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 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?

Yes! Cheapflights helps users easily find flights from Ko Samui to London with no change fees.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to London from Ko Samui today and book when prices fit your budget.

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Cheap flights from Ko Samui to London from £263

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 18/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Ko Samui to London

Cheapest flights from Ko Samui to LondonExplore 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 21 August 2026.

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 21 August 2026.

Best flights from Ko Samui to LondonDiscover carefully curated flight deals from Ko Samui to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Discover carefully curated flight deals from Ko Samui to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Last-minute flights from Ko Samui to LondonDiscover last-minute flight deals from Ko Samui to London. Data last updated 21 August 2026 and is based on user searches.

Discover last-minute flight deals from Ko Samui to London. Data last updated 21 August 2026 and is based on user searches.

One-way flights from Ko Samui to LondonSearch for one-way flight options from Ko Samui to London. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.

Search for one-way flight options from Ko Samui to London. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.

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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.

Cheapflights Insights

Related info for your journey

What airport do you fly from for flights from Ko Samui to London?

How long is the flight from Ko Samui to London?

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

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

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

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

Travelling to a place near London?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ko Samui to London

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to London by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to England

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Search flights from Ko Samui to London by cabin class

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Other flights to London

Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 21 August 2026.

Ko Samui and London flights

Browse other Ko Samui and London flight options. Last updated on 21 August 2026.

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

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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 21 August 2026.

Best flights from Ko Samui to London
Discover carefully curated flight deals from Ko Samui to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Last-minute flights from Ko Samui to London
Discover last-minute flight deals from Ko Samui to London. Data last updated 21 August 2026 and is based on user searches.

One-way flights from Ko Samui to London
Search for one-way flight options from Ko Samui to London. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.