Cheap flights from London to Koh Samui

Q: How much are flights normally?

£ 562. If you see flights from London to Koh Samui for less than this, you've found a good deal.

Q: When is the best time to book cheap flights?

31 weeks. If you want cheap flights from London to Koh Samui, this is the best time to book.

Q: What are the cheapest airlines?

Air France, EVA Air, Emirates, Etihad Airways, Gulf Air. These airlines usually offer the cheapest flights from London to Koh Samui.

Q: What airlines fly indirectly?

Thai Airways International, Emirates, British Airways, Etihad Airways, Qatar Airways. These airlines fly from London to Koh Samui, but you’ll have at least one layover.

Q: When is high season?

July. This is the most expensive time to fly to Koh Samui. If this is when you want to go, book your flight from London in advance.

Q: When is the cheapest time to fly?

November. Flights from London to Koh Samui are usually cheaper at this time of year.

Q: How long is the flight?

14 hrs 5 mins. This is the shortest flight time from London to Koh Samui.

Q: How long should I stay in Koh Samui?

17 days. Most people spend this amount of time in Koh Samui.

from as little as £734

12 nights in Koh Samui, departing London Heathrow on 12 / Sep / 2025 with KLM (price found 33 hours ago)

Subject to availability, prices correct of the last 24 hours

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Cheap return flights from London to Koh Samui

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The London / Koh Samui route

All 9894 km of it

Cheap flight deals for this route

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Koh Samui flight facts

What you need to know

How much are flights normally?

£ 562

If you see flights from London to Koh Samui for less than this, you've found a good deal.

When is the best time to book cheap flights?

31 weeks

If you want cheap flights from London to Koh Samui, this is the best time to book.

What are the cheapest airlines?

Air France
EVA Air
Emirates
Etihad Airways
Gulf Air

These airlines usually offer the cheapest flights from London to Koh Samui.

What airlines fly indirectly?

Thai Airways International
Emirates
British Airways
Etihad Airways
Qatar Airways

These airlines fly from London to Koh Samui, but you’ll have at least one layover.

When is high season?

July

This is the most expensive time to fly to Koh Samui. If this is when you want to go, book your flight from London in advance.

When is the cheapest time to fly?

November

Flights from London to Koh Samui are usually cheaper at this time of year.

How long is the flight?

14 hrs 5 mins

This is the shortest flight time from London to Koh Samui.

How long should I stay in Koh Samui?

17 days

Most people spend this amount of time in Koh Samui.

Alternative flights from the UK to Koh Samui

Check out prices for other routes

Manchester to Koh Samui

from £787 pp

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Edinburgh to Koh Samui

from £777 pp

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Birmingham to Koh Samui

from £766 pp

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London City Airport to Koh Samui

from £941 pp

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London Gatwick to Koh Samui

from £804 pp

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London Heathrow to Koh Samui

from £734 pp

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London Luton to Koh Samui

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London Stansted to Koh Samui

from £898 pp

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Today alone, Netflights has searched over 17,891 flights. 12 / Sep / 2025 is currently the lowest priced day of the year to fly the London/Koh Samui route. There are around 1,474 flights on any given week from the UK to Koh Samui and the cheapest month to fly right now is September.

Not suitable? Try running another search or viewing all cheap flight deals.

Min / Max Temperature (°C)

LOWEST

24 °C

AVG

28 °C

HIGHEST

33 °C

Rainfall (mm)

LOWEST

33 mm

AVG

159.2 mm

HIGHEST

527 mm

Key facts about Koh Samui

Timezone

7 hrs ahead of GMT

How to get cheap flights from London to Koh Samui

Tips and advice from our flight experts

Find a good deal on your flight from London to Koh Samui with Netflights. 1,474 flights go via this route every week, and we've collected them all to help you find the best flight deal. If you want to keep your options open, take a look at flights from another airport in London.

Generally, London Heathrow (LHR) is the most popular choice for flights to Koh Samui. And the most popular airlines are Thai Airways International, British Airways & Etihad Airways. But when you fly is just as important as who you fly with. If you're flexible on dates, try searching by month to see when the cheapest flights are.

On average, the 9894 km flight to Koh Samui takes 18 hrs 20 mins. If you want a bargain, keep an eye out for flights with Air France, as they often have good deals. Or you could broaden your search by looking at flights to other airports in Thailand to see if there are any cheaper options.

We’ve scanned 17,891 flights today to help you find the cheapest deals – not just to Koh Samui, but worldwide. You can also compare the prices of hotels and hire cars for your stay in Thailand. Simply use the tabs above, or add them to your booking once you’ve chosen your flight.