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, 23 / 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 Qatar Airways, Etihad Airways & Lufthansa. Qatar Airways 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 10 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.
