What is the cheapest airline that flies from London to Siem Reap?

Austrian Airlines and SWISS are the most popular carriers operating from London to Siem Reap

Which airlines fly to Region of Siem Reap?

Singapore Airlines, Vietnam Airlines and Thai Airways are the top three most popular airlines that fly to Region of Siem Reap from London according to our data. Singapore Airlines is the first choice among our users, with 54% of people opting to fly with this airline when travelling to Region of Siem Reap. Keep in mind that there are 5 different airlines that fly to Region of Siem Reap on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from London to Siem Reap?

Prices for flights from London to Siem Reap are updated daily.

How many operators does momondo search for flights from London to Siem Reap?

As of February 2026, there are 5 operators available to choose from for flights from London to Siem Reap.

How old do you have to be to fly from London to Siem Reap?

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 London to Siem Reap.

What documentation or ID do you need to fly to Siem Reap?

The required travel and health documents for your Siem Reap 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 Siem Reap. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

£258 Cheap Flights from London to Siem Reap in 2026

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

Search 100s of travel sites to compare prices.

Filter for what you want

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

Trusted and free

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

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from London to Siem Reap

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

11:05 - 18:05

LGW

SAI

24h 00m

2 stops

19:05 - 07:00

SAI

LGW

41h 55m

2 stops

£531Multiple Airlines

Thu, 12 Mar - Thu, 2 Apr

17:50 - 18:45

LHR

SAI

18h 55m

2 stops

10:30 - 08:40

SAI

LHR

28h 10m

2 stops

£560Lufthansa

Wed, 29 Apr - Tue, 26 May

06:00 - 18:45

LHR

SAI

30h 45m

2 stops

16:00 - 07:55

SAI

LHR

21h 55m

2 stops

£573Multiple Airlines

Thu, 18 Jun - Wed, 15 Jul

21:00 - 21:00

LHR

SAI

41h 00m

3 stops

21:10 - 18:40

SAI

LHR

27h 30m

2 stops

£575China Eastern

Sun, 8 Mar - Mon, 30 Mar

21:00 - 21:00

LHR

SAI

41h 00m

3 stops

21:10 - 18:40

SAI

LHR

51h 30m

3 stops

£576China Eastern

Thu, 12 Mar - Mon, 30 Mar

09:15 - 18:45

LGW

SAI

27h 30m

2 stops

10:30 - 08:20

SAI

LGW

27h 50m

2 stops

£592SWISS

Wed, 29 Apr - Tue, 26 May

10:30 - 21:00

LGW

SAI

27h 30m

3 stops

22:00 - 05:40

SAI

LGW

38h 40m

3 stops

£596China Eastern

Mon, 2 Mar - Sat, 28 Mar

09:25 - 18:45

LGW

SAI

27h 20m

2 stops

16:00 - 08:20

SAI

LGW

22h 20m

2 stops

£631SWISS

Thu, 18 Jun - Wed, 15 Jul

20:15 - 21:10

STN

SAI

41h 55m

2 stops

23:50 - 18:45

SAI

STN

24h 55m

2 stops

£765Emirates

Tue, 3 Mar - Tue, 31 Mar

14:05 - 21:10

STN

SAI

24h 05m

2 stops

23:50 - 18:45

SAI

STN

24h 55m

2 stops

£767Emirates

Mon, 9 Mar - Tue, 31 Mar

China Eastern flights from London to Region of Siem Reap

Our best China Eastern deals on London to Region of Siem Reap flight tickets

China Eastern

8 Mar

LHR21:00London Heathrow

41h 00m

3 stops

SAI21:00Siem Reap–Angkor Intl

30 Mar

SAI21:10Siem Reap–Angkor Intl

27h 30m

2 stops

LHR18:40London Heathrow

£575

China Eastern

12 Mar

LHR21:00London Heathrow

41h 00m

3 stops

SAI21:00Siem Reap–Angkor Intl

30 Mar

SAI21:10Siem Reap–Angkor Intl

51h 30m

3 stops

LHR18:40London Heathrow

£576

China Eastern

2 Mar

LGW10:30London Gatwick

27h 30m

2 stops

SAI21:00Siem Reap–Angkor Intl

30 Mar

SAI21:10Siem Reap–Angkor Intl

47h 50m

2 stops

LGW15:00London Gatwick

£596

KLM flights from London to Region of Siem Reap

Our best KLM deals on London to Region of Siem Reap flight tickets

KLM

1 Apr

LCY09:20London City

20h 55m

2 stops

SAI12:15Siem Reap–Angkor Intl

18 Apr

SAI19:30Siem Reap–Angkor Intl

43h 20m

2 stops

LCY08:50London City

£1,551

KLM

1 Apr

LCY09:20London City

20h 55m

2 stops

SAI12:15Siem Reap–Angkor Intl

18 Apr

SAI19:25Siem Reap–Angkor Intl

42h 30m

2 stops

LCY07:55London City

£1,677

KLM

1 Apr

LCY09:20London City

20h 55m

2 stops

SAI12:15Siem Reap–Angkor Intl

18 Apr

SAI19:25Siem Reap–Angkor Intl

30h 50m

2 stops

LCY20:15London City

£1,681

Fly from

Fly to

Route

Depart

Return

Price

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Thu 12/3

11:05-18:05

2 stops24h 00m

Siem Reap–Angkor Intl

Thu 2/4

19:05-07:00

2 stops41h 55m

£531

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 29/4

17:50-18:45

2 stops18h 55m

Siem Reap–Angkor Intl

Tue 26/5

10:30-08:40

2 stops28h 10m

£560

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 18/6

06:00-18:45

2 stops30h 45m

Siem Reap–Angkor Intl

Wed 15/7

16:00-07:55

2 stops21h 55m

£573

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 8/3

21:00-21:00

3 stops41h 00m

Siem Reap–Angkor Intl

Mon 30/3

21:10-18:40

2 stops27h 30m

£575

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 12/3

21:00-21:00

3 stops41h 00m

Siem Reap–Angkor Intl

Mon 30/3

21:10-18:40

3 stops51h 30m

£576

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 29/4

09:15-18:45

2 stops27h 30m

Siem Reap–Angkor Intl

Tue 26/5

10:30-08:20

2 stops27h 50m

£592

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 2/3

10:30-21:00

3 stops27h 30m

Siem Reap–Angkor Intl

Sat 28/3

22:00-05:40

3 stops38h 40m

£596

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Thu 18/6

09:25-18:45

2 stops27h 20m

Siem Reap–Angkor Intl

Wed 15/7

16:00-08:20

2 stops22h 20m

£631

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Tue 3/3

20:15-21:10

2 stops41h 55m

Siem Reap–Angkor Intl

Tue 31/3

23:50-18:45

2 stops24h 55m

£765

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 9/3

14:05-21:10

2 stops24h 05m

Siem Reap–Angkor Intl

Tue 31/3

23:50-18:45

2 stops24h 55m

£767

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from London to Region of Siem Reap

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

Prices

Airlines

What is the cheapest month to fly to Region of Siem Reap?

If you’re not able to fly to Region of Siem Reap in September, then April is your next best option. Flight prices from London to Region of Siem Reap during April average around £727.

How far in advance should I book a flight to Region of Siem Reap?

You are more likely to see cheaper flights to Region of Siem Reap from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Siem Reap for around £784 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Siem Reap from London for as low as £652 on momondo.

Can stopping save me money on London to Region of Siem Reap flights?

You could potentially save up to 22% on your flight if you consider stops on a London to Region of Siem Reap flight.

Cheap London to Region of Siem Reap flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Region of Siem Reap

Fastest flight time	16h 20m
Direct flights	None

The fastest flight from London to Region of Siem Reap takes 16h 20m

There are no direct flights from London to Region of Siem Reap. There are no popular flight routes from London to Region of Siem Reap.

Search flight deals

When did momondo last update prices for flights from London to Siem Reap?
Prices for flights from London to Siem Reap are updated daily.
How many operators does momondo search for flights from London to Siem Reap?
As of February 2026, there are 5 operators available to choose from for flights from London to Siem Reap.
How old do you have to be to fly from London to Siem Reap?
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 London to Siem Reap.
What documentation or ID do you need to fly to Siem Reap?
The required travel and health documents for your Siem Reap 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 Siem Reap. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from London to Region of Siem Reap

Compare and see reviews for airlines that fly from London to Region of Siem Reap with momondo

Airline	Rating	Free Cancellation	Price
Austrian Airlines	PriceFrom £530	Free Cancellation	Rating 7.5 896 reviews	Search Austrian Airlines flights
Lufthansa	PriceFrom £588	Free Cancellation	Rating 6.8 7,780 reviews	Search Lufthansa flights
Vietnam Airlines	PriceFrom £607	Free Cancellation	Rating 7.6 226 reviews	Search Vietnam Airlines flights
Singapore Airlines	PriceFrom £653	Free Cancellation	Rating 8.2 1,452 reviews	Search Singapore Airlines flights
Thai Airways	PriceFrom £845	Free Cancellation	Rating 7.8 382 reviews	Search Thai Airways flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Siem Reap?

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

Can I find flights from London to Siem Reap with flexible booking policies on momondo?

Flights from London to Siem Reap with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Siem Reap?

momondo provides multiple filters to help you find the best flight to Siem Reap from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of London to Siem Reap flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Region of Siem Reap 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

Sat 14/3

Sat 21/3

Email me momondo's favourite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Siem Reap

Popular cities

Other flights from London

Other flights to Siem Reap

Airlines

Cabin classes

Complete your trip

Feeling lucky

Popular Cities in Siem Reap

Flights to Phnom Penhfrom £644

Flights to Siem Reapfrom £560

Cheap flights from London to Siem Reap from £258

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 to Siem Reap departing on 1/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from London to Siem Reap

Cheap return flights

Cheap one-way flights

Cheap last-minute flights

China Eastern flights from London to Region of Siem Reap

Our best China Eastern deals on London to Region of Siem Reap flight tickets

KLM flights from London to Region of Siem Reap

Our best KLM deals on London to Region of Siem Reap flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from London to Siem Reap that are best for you.

See travel insights to Siem Reap from

How to get the cheapest flight ticket from London to Region of Siem Reap

What is the cheapest month to fly to Region of Siem Reap?

How far in advance should I book a flight to Region of Siem Reap?

Can stopping save me money on London to Region of Siem Reap flights?

What is the cheapest airline that flies from London to Siem Reap?

Which airlines fly to Region of Siem Reap?

Cheap London to Region of Siem Reap flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Region of Siem Reap

Fastest flight time

Direct flights

Best airlines flying from London to Region of Siem Reap

Compare and see reviews for airlines that fly from London to Region of Siem Reap with momondo

Why use momondo?

Why should I use momondo to find a flight deal from London to Siem Reap?

Can I find flights from London to Siem Reap with flexible booking policies on momondo?

How can momondo help me find flights from London to Siem Reap?

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

An easier way to manage your Region of Siem Reap 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Siem Reap

Popular Cities in Siem Reap

Popular flights according to clicks in the last 7 days on momondo

London flight routes

According to popular flight searches on momondo this year

Region of Siem Reap flight routes

According to popular flight searches on momondo this year

Fly your favourite airline to Siem Reap

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Siem Reap

List of cabin classes available on flights landing in Siem Reap. Availability may vary depending on flight origin and airline.

Complete your trip to Siem Reap

Explore popular destinations other users love

According to popular flight searches on momondo this year