Cheap Thai Airways International Flights from London to Samui Intl. Airport (LHR→USM)

View NZ$2,191 flight on Thu, 25 Dec 2025Opens in a new window
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Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$3,926 Return, found 12 hours ago
NZ$3,926
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$3,926 found 12 hours ago
Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$4,208 Return, found 12 hours ago
NZ$4,208
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$4,208 found 12 hours ago
Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$4,268 Return, found 12 hours ago
NZ$4,268
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$4,268 found 12 hours ago
Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$4,329 Return, found 12 hours ago
NZ$4,329
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$4,329 found 12 hours ago
Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$4,486 Return, found 12 hours ago
NZ$4,486
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$4,486 found 12 hours ago
Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$4,599 Return, found 12 hours ago
NZ$4,599
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$4,599 found 12 hours ago
Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$4,616 Return, found 12 hours ago
NZ$4,616
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$4,616 found 12 hours ago
Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$4,653 Return, found 12 hours ago
NZ$4,653
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$4,653 found 12 hours ago
Thai Airways International
Thu, 25 Dec - Thu, 1 Jan
LHR
London
USM
Koh Samui
NZ$4,671 Return, found 12 hours ago
NZ$4,671
Return
found 12 hours ago
Select Thai Airways International flight, departing Thu, 25 Dec from London to Koh Samui, returning Thu, 1 Jan, priced at NZ$4,671 found 12 hours ago

Frequently asked questions

How much is a Thai Airways International flight from Heathrow Airport (LHR) to Ko Samui Airport (USM)?
Apply the "Price (lowest to highest)" filter on Expedia to find cheap Thai Airways International round-trip flights from NZ$3,926 from LHR to USM. Affordable one-way tickets from NZ$2,191 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from LHR to USM with Thai Airways International?
Search for one-way or return flights to Koh Samui in October or September. You could find a cheap fare with Thai Airways International during these quieter months.
Does Thai Airways International fly nonstop from Heathrow Airport (LHR) to Ko Samui Airport (USM)?
Fill in your dates, press search and select the "Nonstop" filter on Expedia to find any direct flights from LHR to USM with Thai Airways International or other carriers.
What airports does Thai Airways International fly into in Koh Samui?
Ko Samui Airport (USM) is the primary Koh Samui gateway for Thai Airways International flights from Heathrow Airport (LHR).
Can I change or cancel my Thai Airways International flight from Heathrow Airport (LHR) to Ko Samui Airport (USM)?
Depending on the type of ticket you purchased, a fee will generally apply if you change or cancel your flight more than 24 hours after it's confirmed. To find plane tickets with more flexibility, select our "Changes included" or "No cancel fee" filter when you search for flights. To learn more about cancelling or modifying your reservation, head to "Trips," select your flight and click on "Manage Booking."

Travel information

Origin airport
Heathrow
Destination airport
Samui Intl. Airport
Airlines serving
EVA Airways, Etihad Airways, Qatar Airways, Singapore Airlines, Thai Airways International, Turkish Airlines
Popular airline
Singapore Airlines
Distance
9836 km

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