How long is the flight from Ko Samui to London Heathrow Airport?

A quick flight from Ko Samui to London Heathrow Airport can take about 22h 10m. Etihad Airways provides one of the quickest options available for as low as £831. The distance from Ko Samui to London Heathrow Airport is about 6144 mi.

In terms of precipitation, rainfall in London Heathrow Airport 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 Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, 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 is the cheapest time of day to fly from USM to LHR?

When flying from Ko Samui to London Heathrow Airport, 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 Heathrow?

For a flight from Ko Samui to London Heathrow, you will be flying from Ko Samui. Ko Samui (USM) is just 2.1 mi from the center of the city. Ko Samui is the only Ko Samui airport and it handles 0 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Ko Samui on a regular basis.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Ko Samui to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£273+ Cheap Flights from Ko Samui to London Heathrow Airport

Cheap flight deals from Ko Samui to Heathrow

Enter your travel dates to find the best prices.

Cheapest

Best

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Cheapest flights from Ko Samui to Heathrow
Explore the most affordable flight options available from Ko Samui to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2026.

Mon 19/1019:45 -

2 stops28h 00m

Mon 2/1109:30 -

2 stops23h 10m

Deal found 17/9£660

Tue 13/1011:05 -

3 stops25h 55m

Tue 20/1021:45 -

3 stops30h 25m

Deal found 13/9£791

Thu 8/1011:05 -

3 stops25h 55m

Thu 22/1014:45 -

3 stops35h 00m

Deal found 15/9£796

Sun 1/1120:30 -

1 stop17h 10m

Sun 8/1121:10 -

2 stops27h 35m

Deal found 17/9£827

Mon 19/1020:35 -

2 stops22h 10m

Mon 2/1120:55 -

2 stops27h 15m

Deal found 14/9£831

Wed 16/915:25 -

2 stops33h 45m

Sun 20/920:50 -

2 stops31h 55m

Deal found 13/9£856

Find flight deals from Ko Samui to Heathrow

Round-trip from	£660
One-way from	£273
Popular in	April
Cheapest in	August
Average price	£986

19/10-2/11
4 total stops
51h 10m total
Ko Samui to London

Search Deals

27/10-31/12
2 total stops
25h 15m total
Ko Samui to London

Search Deals

Highest demand for flights based on searches. 15% potential increase in price (£138 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 7% potential price decrease (£58 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ko Samui to London Heathrow Airport that are best for you.

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Fly to

Route

Depart

Return

Price

Cheapest return flight

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 27/10

12:25-06:40

2 stops25h 15m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£281

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 6/10

06:55-18:10

2 stops41h 15m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£325

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 23/2

18:05-16:20

2 stops29h 15m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£370

Fastest return journey

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 26/1

16:30-06:35

2 stops21h 05m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£380

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Sun 21/2

15:35-06:40

1 stop22h 05m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£460

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 26/1

13:25-14:30

2 stops32h 05m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£483

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Mon 19/10

19:45-17:45

2 stops28h 00m

London Heathrow

Mon 2/11

09:30-15:40

2 stops23h 10m

£660

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 13/10

13:30-07:00

2 stops23h 30m

London Heathrow

Tue 20/10

16:35-21:35

3 stops23h 00m

£794

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Mon 19/10

20:35-12:45

2 stops22h 10m

London Heathrow

Mon 2/11

20:55-07:10

2 stops27h 15m

£831

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Wed 23/12

07:00-18:25

2 stops42h 25m

London Heathrow

Sun 3/1

08:25-14:55

2 stops23h 30m

£886

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 14 resultsSorted by cheapest first

Best time to book a flight from Ko Samui to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Ko Samui with our price prediction graph.

USM-LHR

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.

Related info for your journey

What airport do you fly from for flights from Ko Samui to London Heathrow?
For a flight from Ko Samui to London Heathrow, you will be flying from Ko Samui. Ko Samui (USM) is just 2.1 mi from the center of the city. Ko Samui is the only Ko Samui airport and it handles 0 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Ko Samui on a regular basis.
How long is the flight from Ko Samui to London Heathrow Airport?
A quick flight from Ko Samui to London Heathrow Airport can take about 22h 10m. Etihad Airways provides one of the quickest options available for as low as £831. The distance from Ko Samui to London Heathrow Airport is about 6144 mi.
Can I find deals for flights from Ko Samui to Heathrow that include hotel bookings?
Yes. In addition to deals on Ko Samui to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Ko Samui to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ko Samui to Heathrow.
Can I find deals for business class flights from Ko Samui to Heathrow?
Yes. Cheapflights offers flight deals from Ko Samui to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

Need flexible booking options for your flight to Heathrow from Ko Samui? 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 Ko Samui to Heathrow become cheaper?

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Cheap flights from Ko Samui to London Heathrow Airport from £273

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 27/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Ko Samui to Heathrow

Cheapest flights from Ko Samui to HeathrowExplore the most affordable flight options available from Ko Samui to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2026.

Explore the most affordable flight options available from Ko Samui to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2026.

Best flights from Ko Samui to HeathrowDiscover carefully curated flight deals from Ko Samui to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 September 2026.

Discover carefully curated flight deals from Ko Samui to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 September 2026.

Last-minute flights from Ko Samui to HeathrowDiscover last-minute flight deals from Ko Samui to Heathrow. Data last updated 18 September 2026 and is based on user searches.

Discover last-minute flight deals from Ko Samui to Heathrow. Data last updated 18 September 2026 and is based on user searches.

One-way flights from Ko Samui to HeathrowSearch for one-way flight options from Ko Samui to Heathrow. Find affordable one-way fares based on user searches. Data last updated 18 September 2026.

Search for one-way flight options from Ko Samui to Heathrow. Find affordable one-way fares based on user searches. Data last updated 18 September 2026.

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Best time to book a flight from Ko Samui to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Ko Samui with our price prediction graph.

Related info for your journey

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

How long is the flight from Ko Samui to London Heathrow Airport?

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

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

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

Travelling to a place near London Heathrow Airport?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ko Samui to Heathrow

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Complete your trip

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Other flights to Heathrow

Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 18 September 2026.

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

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Cheapest flights from Ko Samui to Heathrow
Explore the most affordable flight options available from Ko Samui to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2026.

Best flights from Ko Samui to Heathrow
Discover carefully curated flight deals from Ko Samui to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 18 September 2026.

Last-minute flights from Ko Samui to Heathrow
Discover last-minute flight deals from Ko Samui to Heathrow. Data last updated 18 September 2026 and is based on user searches.

One-way flights from Ko Samui to Heathrow
Search for one-way flight options from Ko Samui to Heathrow. Find affordable one-way fares based on user searches. Data last updated 18 September 2026.