Swiss Flights from London to Koh Samui

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At the moment, you can catch a direct flight from London to Koh Samui with the following airlines, including: Bangkok Airways EVA Air Oman Air Thai Airways Wizz Air UK Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from London to Koh Samui is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from London to Koh Samui, you can use various tools on Trip.com:
· Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on {{25a2b5_owDate}}, with one-way flights priced at just {{25a2b5_owPrice}}.
· Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is {{airlineName}}.
· Set up price alerts to easily monitor ticket prices without having to check every day.
· Check Trip.com flight deals and promo codes frequently.
· Avoid peak season unless you book very early. It seems the peak season for Koh Samui travel is around {{peakSeason}}.
· Get exclusive promo codes for Trip.com app users.

The cheapest months to fly from London to Koh Samui is April, when demand for travel is lower.

After crunching the numbers on our September flight calendar, it's currently cheapest to fly from London to Koh Samui on September 26, 2025 with Singapore Airlines, with prices starting at £753.

You can land at any one of the following hubs in Koh Samui, with Heathrow Airport to Samui Airport (LHR-USM) is by far the most common option on this route: Samui Airport (USM).

The time difference between Koh Samui and London is 7h.

Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.