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Cheap flights from Ko Samui to London from £269

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ko Samui to London departing on 15/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags
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Cheap return flights

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Lufthansa Logo
16:25 - 09:45USM-LHR
24h 20m2 stops
Lufthansa Logo
17:30 - 21:05LHR-USM
20h 35m2 stops
£752Lufthansa
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Mon, 17 Nov - Mon, 24 Nov
Cathay Pacific Logo
11:40 - 15:00USM-LHR
34h 20m1 stop
Cathay Pacific Logo
17:50 - 19:35LHR-USM
18h 45m1 stop
£863Cathay Pacific
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Mon, 17 Nov - Mon, 24 Nov
Multiple Airlines Logo
21:10 - 18:10USM-LHR
28h 00m2 stops
Multiple Airlines Logo
08:40 - 12:45LHR-USM
21h 05m3 stops
£945Multiple Airlines
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Wed, 17 Dec - Wed, 31 Dec
Multiple Airlines Logo
15:05 - 06:35USM-LHR
22h 30m2 stops
Multiple Airlines Logo
08:45 - 11:30LHR-USM
19h 45m2 stops
£955Multiple Airlines
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Wed, 17 Dec - Wed, 31 Dec
Multiple Airlines Logo
20:20 - 18:10USM-LHR
28h 50m2 stops
Multiple Airlines Logo
21:35 - 19:50LHR-USM
15h 15m1 stop
£1,016Multiple Airlines
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Wed, 17 Dec - Wed, 31 Dec
Thai Airways Logo
08:30 - 19:35USM-LHR
18h 05m1 stop
Thai Airways Logo
21:35 - 08:10LHR-USM
27h 35m1 stop
£1,076Thai Airways
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Wed, 17 Dec - Wed, 31 Dec
Cathay Pacific Logo
08:30 - 05:25USM-LHR
27h 55m2 stops
Cathay Pacific Logo
17:50 - 19:35LHR-USM
18h 45m1 stop
£1,177Cathay Pacific
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Mon, 17 Nov - Mon, 24 Nov
Multiple Airlines Logo
21:10 - 11:15USM-LHR
21h 05m2 stops
Multiple Airlines Logo
21:30 - 08:10LHR-USM
27h 40m2 stops
£1,292Multiple Airlines
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Tue, 6 Jan - Wed, 7 Jan
EVA Air Logo
19:35 - 19:05USM-LHR
30h 30m1 stop
EVA Air Logo
21:20 - 21:20LHR-USM
17h 00m1 stop
£1,433EVA Air
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Tue, 6 Jan - Wed, 7 Jan
Thai Airways Logo
08:30 - 19:35USM-LHR
18h 05m1 stop
Thai Airways Logo
21:35 - 18:40LHR-USM
14h 05m1 stop
£1,733Thai Airways
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Mon, 5 Jan - Mon, 5 Jan

Cathay Pacific flights from Ko Samui to London Heathrow Airport

Our best Cathay Pacific deals on Ko Samui to London Heathrow Airport flight tickets
Cathay Pacific
17 Nov
USM11:40Ko Samui
34h 20m
1 stop
LHR15:00London Heathrow
24 Nov
LHR17:50London Heathrow
18h 45m
1 stop
USM19:35Ko Samui
£863
Find similar
Cathay Pacific
17 Nov
USM08:30Ko Samui
27h 55m
2 stops
LHR05:25London Heathrow
24 Nov
LHR17:50London Heathrow
18h 45m
1 stop
USM19:35Ko Samui
£1,177
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Thai Airways flights from Ko Samui to London Heathrow Airport

Our best Thai Airways deals on Ko Samui to London Heathrow Airport flight tickets
Thai Airways
17 Dec
USM08:30Ko Samui
18h 05m
1 stop
LHR19:35London Heathrow
31 Dec
LHR21:35London Heathrow
27h 35m
1 stop
USM08:10Ko Samui
£1,076
Find similar
Thai Airways
5 Jan
USM08:30Ko Samui
18h 05m
1 stop
LHR19:35London Heathrow
5 Jan
LHR21:35London Heathrow
14h 05m
1 stop
USM18:40Ko Samui
£1,733
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momondo Fare Finder

 
Customise your flight search to find flights from Ko Samui to London Heathrow Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 7 November 2025.
Use the filters below to find and compare flights from Ko Samui to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mon 17/11

16:25-09:45

2 stops24h 20m

London Heathrow

Mon 24/11

17:30-21:05

2 stops20h 35m

£752

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mon 17/11

11:40-15:00

1 stop34h 20m

London Heathrow

Mon 24/11

17:50-19:35

1 stop18h 45m

£863

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Wed 17/12

21:10-18:10

2 stops28h 00m

London Heathrow

Wed 31/12

08:40-12:45

3 stops21h 05m

£945

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Wed 17/12

15:05-06:35

2 stops22h 30m

London Heathrow

Wed 31/12

08:45-11:30

2 stops19h 45m

£955

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Wed 17/12

20:20-18:10

2 stops28h 50m

London Heathrow

Wed 31/12

21:35-19:50

1 stop15h 15m

£1,016

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Wed 17/12

08:30-19:35

1 stop18h 05m

London Heathrow

Wed 31/12

21:35-08:10

1 stop27h 35m

£1,076

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mon 17/11

08:30-05:25

2 stops27h 55m

London Heathrow

Mon 24/11

17:50-19:35

1 stop18h 45m

£1,177

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Tue 6/1

21:10-11:15

2 stops21h 05m

London Heathrow

Wed 7/1

21:30-08:10

2 stops27h 40m

£1,292

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Tue 6/1

19:35-19:05

1 stop30h 30m

London Heathrow

Wed 7/1

21:20-21:20

1 stop17h 00m

£1,433

Ko SamuiLondon

USM - LHR

USMLHR

Ko Samui

Mon 5/1

08:30-19:35

1 stop18h 05m

London Heathrow

Mon 5/1

21:35-18:40

1 stop14h 05m

£1,733

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Ko Samui to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from Ko Samui is on a Friday. momondo users have found tickets for Friday departures for as low as £527. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Monday is £893.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Ko Samui to London Heathrow Airport in the evening for as low as £554. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £663 on average. Flights to London Heathrow Airport from Ko Samui in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Can stopping save me money on Ko Samui to London Heathrow Airport flights?

You could potentially save up to 1% on your flight if you consider stops on a Ko Samui to London Heathrow Airport flight.

When to book flights from Ko Samui to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ko Samui to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Ko Samui to London Heathrow Airport (USM to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ko Samui to London Heathrow Airport

Direct flights

None
There are no direct flights from Ko Samui to London Heathrow Airport. There are no popular flight routes from Ko Samui to London Heathrow Airport.
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  • How far is Ko Samui to London Heathrow by plane?

    The straight-line distance from Ko Samui to London Heathrow is 6145.4 mi. Typically, this will take 18h 05m by plane in normal conditions.

  • When did momondo last update prices for flights from Ko Samui Airport to London Heathrow Airport?

    Prices for flights from Ko Samui Airport to London Heathrow Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Ko Samui Airport to London Heathrow Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ko Samui Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Maidstone
Slough
Northampton
Swindon
Canterbury
Stratford-upon-Avon
Southend-on-Sea
Ipswich
Ilford
Poole
Guildford
Swanage
Dover
Colchester
Chelmsford
Hayes

Why use momondo?

Why should I use momondo to find a flight deal from Ko Samui to London?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ko Samui to London. momondo saves you time and could save you money on your trip.

Can I find flights from Ko Samui to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from Ko Samui with this policy.

How can momondo help me find flights from Ko Samui to London?

Once you have performed a search for Ko Samui to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ko Samui to London right now. Can momondo alert me if prices change?

Price alerts on flights to London from Ko Samui are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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