CA $891 Cheap Flights from London (LHR) to Koh Samui (USM)

Within the past 7 days on Expedia, for flights departing within the next year, the lowest price available for a round-trip flight from Heathrow Airport (LHR) to USM was CA $1,603. Cheap tickets don't last forever, so make sure you book yours today. Prices and availability are subject to change. Additional terms apply.

Every air carrier has different terms and conditions. If you decide to cancel your vacation, head to our Customer Service Portal.

Select our "No change fees" filter to find flexible ticketing options for your flight from London Heathrow to Ko Samui Airport (USM). This allows you to snag a good price ahead of time and still have the freedom to reschedule without any additional fees. Fare adjustments may apply if your new flight is more expensive.

It takes an average of 12 hours and 39 minutes to jet from LHR to USM. If you're planning to catch up on lost sleep, bring a pillow, an eye mask and some earplugs.

You'll have 9,900 kilometres to cover on the long-haul Hounslow to Koh Samui route. Wear comfortable clothes and consider taking a pair of noise-cancelling headphones.

You won't find any airlines flying directly between LHR and USM, so be prepared to make at least one stop on your journey. A layover can be a nice way to break up a trip!

It is possible to pick up a great last-minute deal from LHR to USM, but there's no guarantee. As many airlines release prices up to a year in advance, it's worthwhile keeping an eye on fares early and being ready to book when you spot a good bargain. Expedia compares air carrier prices and updates flight deals regularly, so you can rest assured you're always getting the latest offers.