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.

£271+ 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

Last-minute

One-way

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 30 October 2026.

Thu 5/1121:30 -

2 stops27h 30m

Wed 11/1112:30 -

2 stops24h 05m

Deal found 29/10£665

Thu 5/1118:15 -

2 stops26h 35m

Mon 9/1109:10 -

2 stops21h 40m

Deal found 28/10£878

Thu 5/1115:50 -

2 stops27h 15m

Mon 9/1113:55 -

2 stops20h 35m

Deal found 26/10£893

Thu 5/1120:30 -

2 stops22h 45m

Mon 9/1109:25 -

2 stops19h 30m

Deal found 25/10£931

Thu 10/1215:05 -

2 stops22h 35m

Thu 17/1219:20 -

2 stops30h 05m

Deal found 26/10£959

Sun 13/1219:10 -

2 stops26h 20m

Sun 20/1219:20 -

2 stops28h 50m

Deal found 29/10£979

Sun 13/1215:35 -

2 stops21h 50m

Sun 20/1213:45 -

2 stops35h 25m

Deal found 29/10£982

Fri 11/1208:40 -

1 stop17h 55m

Fri 18/1211:50 -

1 stop20h 45m

Deal found 27/10£992

Find flight deals from Ko Samui to Heathrow

Round-trip from	£709
One-way from	£271

13/1-20/1
4 total stops
56h 00m total
Ko Samui to London

Search Deals

16/11-31/12
2 total stops
40h 20m total
Ko Samui to London

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.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 17/11

08:50-18:10

2 stops40h 20m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£273

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Sat 12/12

21:30-09:35

2 stops43h 05m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£282

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Wed 18/11

15:35-18:10

3 stops33h 35m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£304

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Tue 26/1

11:10-11:30

2 stops31h 20m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£399

Fastest return journey

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Sat 12/12

20:30-06:40

1 stop17h 10m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£474

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Wed 30/12

17:40-08:00

2 stops21h 20m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£484

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Sat 16/1

11:40-20:10

1 stop39h 30m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£676

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Fri 22/1

18:05-05:55

1 stop18h 50m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£690

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Wed 13/1

08:55-06:40

2 stops28h 45m

London Heathrow

Wed 20/1

08:40-18:55

2 stops27h 15m

£709

Ko SamuiLondon

USM Ko Samui - LHR London Heathrow

USMLHR

Ko Samui

Mon 25/1

08:55-06:40

2 stops28h 45m

London Heathrow

Thu 28/1

08:40-18:55

2 stops27h 15m

£741

Flights are sorted by cheapest return flights first.

Deals found on 27/10

Showing 1-10 of 17 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.
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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How does Cheapflights help users find flights from Ko Samui to Heathrow?

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

Millions of users choose and trust Cheapflights to book the best flight deals from Ko Samui to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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?

Yes, Cheapflights offers price alerts on Ko Samui to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from Ko Samui to London Heathrow Airport from £271

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/11. 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 30 October 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 30 October 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 30 October 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 30 October 2026.

Last-minute flights from Ko Samui to HeathrowDiscover last-minute flight deals from Ko Samui to Heathrow. Data last updated 30 October 2026 and is based on user searches.

Discover last-minute flight deals from Ko Samui to Heathrow. Data last updated 30 October 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 30 October 2026.

Search for one-way flight options from Ko Samui to Heathrow. Find affordable one-way fares based on user searches. Data last updated 30 October 2026.

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

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?

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

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

Alternative routes for Ko Samui to Heathrow

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

Complete your trip

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

Direct flights to England

Book a non-stop flight to one of these other cities located in England.

Search flights from Ko Samui to Heathrow by cabin class

Find flights from Ko Samui to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.

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 30 October 2026.

Ko Samui and Heathrow flights

Browse other Ko Samui and Heathrow flight options. Last updated on 30 October 2026.

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How does Cheapflights help users find flights from Ko Samui to Heathrow?

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

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

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 30 October 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 30 October 2026.

Last-minute flights from Ko Samui to Heathrow
Discover last-minute flight deals from Ko Samui to Heathrow. Data last updated 30 October 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 30 October 2026.