Cheap Flights London – Koh Samui from £407

Flight FAQs

• Which airlines offer the cheapest flights from London (LON) to Koh Samui (USM)?

  Based on Trip.com data, Norse Atlantic Airways offers one-way fares as low as £407 on Cheapest nonstop routes (e.g. LGW to USM on Fri, Apr 10), while EVA Air offers Cheapest nonstop round-trips from £822 departing on Thu, May 14 and returning on Wed, May 20.

• Which airlines offer direct flights from London to Koh Samui?

  At the moment, you can catch a direct flight from London to Koh Samui with the following airlines, including: Norse Atlantic Airways Thai Airways Bangkok Airways Qantas Airways China Eastern Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• When is the best time to book flights from London to Koh Samui?

  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.

• How can I find the best deals on flights from London to Koh Samui?

  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 Fri, Apr 10, with one-way flights priced at just £407.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Norse Atlantic Airways.
  · 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 July.
  · Get exclusive promo codes for Trip.com app users.

• When is the best time to book a flight from London to Koh Samui to get the best price?

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

• Which upcoming date is the cheapest for flights from London to Koh Samui?

  After crunching the numbers on our March flight calendar, it's currently cheapest to fly from London to Koh Samui on March 21, 2026 with Norse Atlantic Airways, with prices starting at £827.

• Which airports can I fly through when travelling to Koh Samui from London?

  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).

• What is the time difference between London and Koh Samui?

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

• How can I change or cancel my flight ticket from London to Koh Samui?

  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.