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. Find deals

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). Find deals

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. Find deals

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

Most people fly from Ko Samui (USM) if they book a flight from Ko Samui to London Heathrow. On average, Ko Samui has 0 outbound flights to London Heathrow per day from 0 airlines. Ko Samui is conveniently located just 3.3 km from Ko Samui’s city centre. Find deals

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.

฿12,674+ Flights from Ko Samui to London Heathrow Airport

Find flight deals from Ko Samui to Heathrow

Enter your travel dates to find the best prices.

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 2025.

Fri 12/1211:40USM - LHR

2 stops26h 00mเอทิฮัดแอร์เวย์

Fri 19/1213:55LHR - USM

2 stops18h 15mเอทิฮัดแอร์เวย์

Deal found 28/10฿53,475

Fri 12/1210:00USM - LHR

1 stop16h 35mMultiple Airlines

Fri 19/1221:35LHR - USM

1 stop27h 10mMultiple Airlines

Deal found 28/10฿53,928

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 2025.

Mon 30/307:00USM - LHR

2 stops35h 40mMultiple Airlines

Tue 7/414:40LHR - USM

2 stops24h 55mMultiple Airlines

Deal found 28/10฿30,520

Fri 12/1210:00USM - LHR

1 stop16h 35mMultiple Airlines

Fri 19/1221:35LHR - USM

1 stop27h 10mMultiple Airlines

Deal found 28/10฿53,928

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 2025.

Sat 22/1119:45USM - LHR

3 stops53h 10mMultiple Airlines

Deal found 29/10฿12,674

Sun 7/1208:55USM - LHR

3 stops40h 00mMultiple Airlines

Deal found 29/10฿13,514

Mon 20/409:15USM - LHR

2 stops36h 05mMultiple Airlines

Deal found 28/10฿15,196

Fri 17/419:25USM - LHR

2 stops32h 15mMultiple Airlines

Deal found 28/10฿17,911

Sun 19/420:50USM - LHR

2 stops48h 30mMultiple Airlines

Deal found 28/10฿18,493

Tue 13/114:30USM - LHR

2 stops33h 25mMultiple Airlines

Deal found 28/10฿19,851

Sat 22/1111:40USM - LHR

1 stop34h 20mCathay Pacific

Deal found 29/10฿20,110

Cheap flight deals from Ko Samui to Heathrow

Round-trip from	฿30,520
One-way from	฿12,674
Popular in	January
Cheapest in	June
Average price	฿47,527

30/3-7/4
4 total stops
60h 35m total
Ko Samui to London

Search Deals

22/11
3 total stops
53h 10m total
Ko Samui to London

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (฿198,613 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease (฿88,260 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 2025

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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

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mon 30/3

07:00-12:40

2 stops35h 40m

London Heathrow

Tue 7/4

14:40-21:35

2 stops24h 55m

฿30,520

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Fri 12/12

10:00-19:35

1 stop16h 35m

London Heathrow

Fri 19/12

21:35-07:45

1 stop27h 10m

฿53,928

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Sat 22/11

15:50-19:20

2 stops34h 30m

฿13,126

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Sun 7/12

08:55-17:55

3 stops40h 00m

฿13,514

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mon 20/4

09:15-15:20

2 stops36h 05m

฿15,196

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Fri 17/4

19:25-21:40

2 stops32h 15m

฿17,911

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Sun 19/4

20:50-15:20

2 stops48h 30m

฿18,493

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Sat 22/11

11:40-15:00

1 stop34h 20m

฿20,110

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Tue 13/1

11:40-17:20

1 stop36h 40m

฿20,498

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Sat 18/4

15:55-10:00

3 stops24h 05m

฿20,659

Flights are sorted by cheapest return flights first.

Deals found on 29/10

Showing 1-10 of 12 results

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.

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?
Most people fly from Ko Samui (USM) if they book a flight from Ko Samui to London Heathrow. On average, Ko Samui has 0 outbound flights to London Heathrow per day from 0 airlines. Ko Samui is conveniently located just 3.3 km from Ko Samui’s city centre.
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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Cheapflights makes it easy to find Ko Samui to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ko Samui to Heathrow flexibly with Cheapflights today.

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 ฿12,674

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 22/11. Fares are subject to change and may not be available on all flights or dates of travel.

Find 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 2025.

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 2025.

Cheap flight deals from Ko Samui to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Find useful and relevant information for your journey from Ko Samui to Heathrow. 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 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.

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 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 2025.