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Cheap flights from Ko Samui to London Heathrow Airport from £351

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 7/5. Fares are subject to change and may not be available on all flights or dates of travel.
USM — LHR
4 Jan — 11 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ko Samui to Heathrow

Enter your travel dates to find the best prices.

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 5 Dezember 2025.

So 18/121:10USM - LHR
2 stops26h 50mMultiple Airlines
So 25/121:00LHR - USM
2 stops28h 25mMultiple Airlines
Deal found 4/12£719
Mo 9/311:40USM - LHR
2 stops25h 45mQatar Airways
Fr 13/308:05LHR - USM
2 stops27h 10mQatar Airways
Deal found 2/12£979
Mo 9/313:25USM - LHR
1 stop23h 30mBritish Airways
Fr 13/318:40LHR - USM
1 stop19h 25mBritish Airways
Deal found 2/12£1,046

Find flight deals from Ko Samui to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Ko Samui (USM) to Heathrow (LHR). 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 5 Dezember 2025.

Round-trip from

£719

One-way from

£351

Popular in

January

Cheapest in

May

Average price

£967
18/1-25/1
  • 18/1-25/1
  • 4 total stops
  • 55h 15m total
  • Ko Samui to London
Search Deals
7/5
  • 7/5
  • 3 total stops
  • 33h 40m total
  • Ko Samui to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£185 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£44 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Ko Samui to Heathrow 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 858,174 searches. Data last updated 5 Dezember 2025.
Use the filters below to find and compare flights from Ko Samui to London Heathrow Airport that are best for you.

Fly from

Ko Samui

Fly to

Heathrow

Route

Depart

Return

Price

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

So 18/1

21:10-17:00

2 stops26h 50m

London Heathrow

So 25/1

21:00-08:25

2 stops28h 25m

£719

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mo 9/3

11:40-06:25

2 stops25h 45m

London Heathrow

Fr 13/3

08:05-18:15

2 stops27h 10m

£979

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mo 9/3

13:25-05:55

1 stop23h 30m

London Heathrow

Fr 13/3

18:40-21:05

1 stop19h 25m

£1,046

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Do 7/5

15:50-19:30

3 stops33h 40m

£351

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mo 16/2

12:25-18:10

3 stops36h 45m

£373

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mi 18/2

16:45-18:35

2 stops32h 50m

£423

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Di 13/1

11:40-17:20

1 stop36h 40m

£615

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Do 5/2

11:00-13:45

3 stops33h 45m

£788

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Sa 7/2

06:45-13:45

3 stops38h 00m

£821

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Di 3/2

16:35-13:45

3 stops28h 10m

£823

Flights are sorted by cheapest return flights first.

Deals found on 3/12

Showing 1-10 of 13 results
1
2

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.

Cheapflights Insights

Everything you need to know about your flight from Ko Samui to London Heathrow Airport

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

Find hourly flight availability from Ko Samui to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 Dezember 2025.

It’s typically best to fly out from Ko Samui to London Heathrow Airport in the evening. Doing so could potentially save you 38% on the flight price compared to flying at midday, which is usually more expensive.

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?

    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 23h 30m. Qatar Airways provides one of the quickest options available for as low as £1,046. The distance from Ko Samui to London Heathrow Airport is about 6144 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from Ko Samui to London Heathrow Airport one-way?

    £387 is the cheapest one-way deal found within the past few days, from Thai Airways. You may also be able to find cheap deals on Qatar Airways and EVA Air, with prices starting from £450 and £455, respectively.

  • 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.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
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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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