Cheap flights from London Heathrow to Koh Samui

Q: How much are flights normally?

£ 587. If you see flights from London Heathrow to Koh Samui for less than this, you've found a good deal.

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

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

Q: What are the cheapest airlines?

EVA Air, Emirates, Gulf Air, Lufthansa, Qatar Airways. These airlines usually offer the cheapest flights from London Heathrow to Koh Samui.

Q: What airlines fly indirectly?

EVA Air, Qatar Airways, Lufthansa, Emirates, Etihad Airways. These airlines fly from London Heathrow to Koh Samui, but you’ll have at least one layover.

Q: When is high season?

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

Q: When is the cheapest time to fly?

November. Flights from London Heathrow 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 Heathrow to Koh Samui.

Q: How long should I stay in Koh Samui?

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

from as little as £732

14 nights in Koh Samui, departing London Heathrow on 24 / Mar / 2025 with Gulf Air (price found 32 hours ago)

Subject to availability, prices correct of the last 24 hours

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Cheap return flights from London Heathrow to Koh Samui

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The London Heathrow / Koh Samui route

All 9903 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?

£ 587

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

When is the best time to book cheap flights?

17 weeks

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

What are the cheapest airlines?

EVA Air
Emirates
Gulf Air
Lufthansa
Qatar Airways

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

What airlines fly indirectly?

EVA Air
Qatar Airways
Lufthansa
Emirates
Etihad Airways

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

When is high season?

March

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

When is the cheapest time to fly?

November

Flights from London Heathrow 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 Heathrow to Koh Samui.

How long should I stay in Koh Samui?

15 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

London to Koh Samui

from £732 pp

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Manchester to Koh Samui

from £792 pp

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Edinburgh to Koh Samui

from £844 pp

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Birmingham to Koh Samui

from £867 pp

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London Luton to Koh Samui

search for price

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London Stansted to Koh Samui

from £860 pp

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London City Airport to Koh Samui

from £1,185 pp

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London Gatwick to Koh Samui

from £789 pp

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Alternative flights from London Heathrow

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Today alone, Netflights has searched over 18,381 flights. 24 / Mar / 2025 is currently the lowest priced day of the year to fly the London Heathrow/Koh Samui route. There are around 655 flights on any given week from the UK to Koh Samui and the cheapest month to fly right now is March.

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 Heathrow to Koh Samui

Tips and advice from our flight experts

We've gone through lots of different flights, to help you find the cheapest way to get from London Heathrow to Koh Samui. You can choose from 14 airlines. At the moment, 24 / Mar / 2025 is the cheapest date to travel, but scroll through the results to find the option that works best for you.

The most popular airlines offering flights to Koh Samui are EVA Air, Qatar Airways & Lufthansa. EVA Air is the most popular one, but that doesn’t mean their flights will be the cheapest. If you can't find a flight time that suits you, why not look at flying out from a different airport?

The distance between London Heathrow to Koh Samui is 9903 km. Normally, it takes about 17 hrs 40 mins to fly, and you can definitely expect the journey to be at least 14 hrs 5 mins. You can see the various flight times in the results.

November is normally the cheapest month to fly to Koh Samui, but it’s important to try different options when you search. Searching by month, for instance, will show you the best time of the week to fly. March is always the most expensive time to fly but, if you check regularly and book early, you have a better chance of getting a good deal.