Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from London Heathrow Airport to Ko Samui from £333

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Ko Samui departing on 15/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from London Heathrow Airport to Ko Samui

Cheap return flights

Logo
13:00 - 18:55LHR-USM
22h 55m2 stops
Logo
07:00 - 11:05USM-LHR
35h 05m2 stops
£697
Find Deal
Sun, 26 Oct - Sun, 2 Nov
Logo
10:00 - 12:45LHR-USM
20h 45m2 stops
Logo
13:30 - 06:55USM-LHR
23h 25m2 stops
£704
Find Deal
Mon, 29 Sep - Mon, 6 Oct
KLM Logo
14:45 - 18:15LHR-USM
21h 30m2 stops
KLM Logo
08:00 - 20:55USM-LHR
18h 55m2 stops
£735KLM
Find Deal
Thu, 18 Sep - Mon, 29 Sep
KLM Logo
14:45 - 18:15LHR-USM
21h 30m2 stops
KLM Logo
08:45 - 20:55USM-LHR
18h 10m2 stops
£765KLM
Find Deal
Thu, 18 Sep - Mon, 29 Sep
Singapore Airlines Logo
21:45 - 08:00LHR-USM
27h 15m1 stop
Singapore Airlines Logo
12:00 - 15:20USM-LHR
34h 20m1 stop
£768Singapore Airlines
Find Deal
Tue, 4 Nov - Thu, 20 Nov
Singapore Airlines Logo
21:45 - 08:00LHR-USM
27h 15m1 stop
Singapore Airlines Logo
19:45 - 15:20USM-LHR
26h 35m1 stop
£769Singapore Airlines
Find Deal
Tue, 11 Nov - Tue, 25 Nov
Thai Airways Logo
11:50 - 15:35LHR-USM
20h 45m1 stop
Thai Airways Logo
13:45 - 06:40USM-LHR
23h 55m1 stop
£790Thai Airways
Find Deal
Tue, 28 Oct - Wed, 26 Nov
Thai Airways Logo
21:35 - 07:15LHR-USM
26h 40m1 stop
Thai Airways Logo
07:00 - 06:40USM-LHR
30h 40m1 stop
£801Thai Airways
Find Deal
Mon, 3 Nov - Mon, 1 Dec
EVA Air Logo
21:35 - 18:30LHR-USM
14h 55m1 stop
EVA Air Logo
08:45 - 19:20USM-LHR
16h 35m1 stop
£805EVA Air
Find Deal
Wed, 8 Oct - Fri, 24 Oct
EVA Air Logo
21:35 - 18:30LHR-USM
14h 55m1 stop
EVA Air Logo
08:00 - 19:20USM-LHR
17h 20m1 stop
£806EVA Air
Find Deal
Sun, 28 Sep - Fri, 17 Oct

KLM flights from London Heathrow Airport to Ko Samui

Our best KLM deals on London Heathrow Airport to Ko Samui flight tickets
KLM
18 Sept
LHR14:45London Heathrow
21h 30m
2 stops
USM18:15Ko Samui
29 Sept
USM08:00Ko Samui
18h 55m
2 stops
LHR20:55London Heathrow
£735
Find similar
KLM
18 Sept
LHR14:45London Heathrow
21h 30m
2 stops
USM18:15Ko Samui
29 Sept
USM08:45Ko Samui
18h 10m
2 stops
LHR20:55London Heathrow
£765
Find similar

Singapore Airlines flights from London Heathrow Airport to Ko Samui

Our best Singapore Airlines deals on London Heathrow Airport to Ko Samui flight tickets
Singapore Airlines
4 Nov
LHR21:45London Heathrow
27h 15m
1 stop
USM08:00Ko Samui
20 Nov
USM12:00Ko Samui
34h 20m
1 stop
LHR15:20London Heathrow
£768
Find similar
Singapore Airlines
11 Nov
LHR21:45London Heathrow
27h 15m
1 stop
USM08:00Ko Samui
25 Nov
USM19:45Ko Samui
26h 35m
1 stop
LHR15:20London Heathrow
£769
Find similar
Singapore Airlines
5 Nov
LHR21:45London Heathrow
27h 15m
1 stop
USM08:00Ko Samui
22 Nov
USM08:55Ko Samui
37h 25m
1 stop
LHR15:20London Heathrow
£802
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport to Ko Samui 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 12 September 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 26/10

13:00-18:55

2 stops22h 55m

Ko Samui

Sun 2/11

07:00-11:05

2 stops35h 05m

£697

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 29/9

10:00-12:45

2 stops20h 45m

Ko Samui

Mon 6/10

13:30-06:55

2 stops23h 25m

£704

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 18/9

14:45-18:15

2 stops21h 30m

Ko Samui

Mon 29/9

08:00-20:55

2 stops18h 55m

£735

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Thu 18/9

14:45-18:15

2 stops21h 30m

Ko Samui

Mon 29/9

08:45-20:55

2 stops18h 10m

£765

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 4/11

21:45-08:00

1 stop27h 15m

Ko Samui

Thu 20/11

12:00-15:20

1 stop34h 20m

£768

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 11/11

21:45-08:00

1 stop27h 15m

Ko Samui

Tue 25/11

19:45-15:20

1 stop26h 35m

£769

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Tue 28/10

11:50-15:35

1 stop20h 45m

Ko Samui

Wed 26/11

13:45-06:40

1 stop23h 55m

£790

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Mon 3/11

21:35-07:15

1 stop26h 40m

Ko Samui

Mon 1/12

07:00-06:40

1 stop30h 40m

£801

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Wed 8/10

21:35-18:30

1 stop14h 55m

Ko Samui

Fri 24/10

08:45-19:20

1 stop16h 35m

£805

LondonKo Samui

LHR - USM

LHRUSM

London Heathrow

Sun 28/9

21:35-18:30

1 stop14h 55m

Ko Samui

Fri 17/10

08:00-19:20

1 stop17h 20m

£806

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Ko Samui from

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

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 month to fly to Ko Samui?

The cheapest month to fly to Ko Samui from London Heathrow Airport is in May. Flight prices, which tend to average around £781, are often lower during this time because this is during the off-season. If you don’t want to visit Ko Samui in May, then you should wait until September to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £786.

What is the cheapest day to depart on your flight to Ko Samui?

According to our data, Wednesday is the cheapest day to fly to Ko Samui from London Heathrow Airport. The lowest ticket price found for a Wednesday departure recently was £488. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Ko Samui on Sunday is £832.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our most recent data shows that the best time of day to fly to Ko Samui is in the afternoon. Flights from London Heathrow Airport to Ko Samui during this time can be as low as £494. Flights at midday are often more expensive, with an average ticket price of £803.

How far in advance should I book a flight to Ko Samui?

You are more likely to see cheaper flights to Ko Samui from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ko Samui for around £908 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ko Samui from London Heathrow Airport for as low as £785 on momondo.

When to book flights from London Heathrow Airport to Ko Samui

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

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

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

Direct flights

None
There are no direct flights from London Heathrow Airport to Ko Samui. There are no popular flight routes from London Heathrow Airport to Ko Samui.
Search flight deals

  • How far is London Heathrow to Ko Samui by plane?

    The straight-line distance from London Heathrow to Ko Samui is 6145.4 mi. Flights usually cover this in 14h 55m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from London Heathrow Airport to Ko Samui Airport were last updated today.

  • How many operators does momondo search for flights from London Heathrow Airport to Ko Samui Airport?

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London Heathrow Airport to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The required travel and health documents for your Ko Samui Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ko Samui Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from London Heathrow Airport to Ko Samui?

Best airlines flying from London Heathrow Airport to Ko Samui

Compare and see reviews for airlines that fly from London Heathrow Airport to Ko Samui with momondo
Airline
Rating
Free Cancellation
Price
Bangkok AirwaysPriceFrom £111Free CancellationRating
8.0
113 reviews
Search Bangkok Airways flights
Austrian AirlinesPriceFrom £594Free CancellationRating
7.6
850 reviews
Search Austrian Airlines flights
SWISSPriceFrom £603Free CancellationRating
7.5
1,731 reviews
Search SWISS flights
EmiratesPriceFrom £617Free CancellationRating
8.1
3,334 reviews
Search Emirates flights
KLMPriceFrom £628Free CancellationRating
7.8
1,385 reviews
Search KLM flights
LufthansaPriceFrom £630Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
Air FrancePriceFrom £653Free CancellationRating
7.4
1,469 reviews
Search Air France flights
Etihad AirwaysPriceFrom £663Free CancellationRating
7.4
1,250 reviews
Search Etihad Airways flights
EVA AirPriceFrom £725Free CancellationRating
8.4
1,236 reviews
Search EVA Air flights
British AirwaysPriceFrom £734Free CancellationRating
6.6
7,361 reviews
Search British Airways flights

Travelling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao
Khanom

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Ko Samui for you.

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

momondo does allow users to show only those flights to Ko Samui from London which offer a flexible booking policy as well as other useful filters and features.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from London to Ko Samui.

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

If you are not ready to book a flight from London to Ko Samui now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ko Samui and let you know when they change.

An easier way to manage your Ko Samui trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 12/10
Sun 19/10
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Thailand