Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from London to Southeast Asia from €347

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 Southeast Asia departing on 7/1. 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 the 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 to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
China Southern Logo
22:00 - 01:05
LHR
-
BKK
20h 05m1 stop
China Southern Logo
19:55 - 17:55
BKK
-
LHR
29h 00m2 stops
€524China Southern
Wed, 21 Jan - Wed, 28 Jan
Hainan Airlines Logo
21:00 - 18:05
LHR
-
BKK
38h 05m2 stops
Hainan Airlines Logo
19:10 - 17:35
BKK
-
LHR
29h 25m2 stops
€526Hainan Airlines
Fri, 16 Jan - Thu, 29 Jan
Shenzhen Airlines Logo
21:10 - 02:15
LHR
-
BKK
22h 05m1 stop
Shenzhen Airlines Logo
12:10 - 20:00
BKK
-
LHR
37h 50m1 stop
€532Shenzhen Airlines
Sun, 15 Mar - Tue, 7 Apr
Air India Logo
21:05 - 20:20
LHR
-
BKK
16h 15m1 stop
Air India Logo
20:50 - 11:05
BKK
-
LHR
21h 15m1 stop
€540Air India
Tue, 10 Feb - Wed, 4 Mar
Shenzhen Airlines Logo
21:10 - 11:10
LHR
-
BKK
31h 00m1 stop
Shenzhen Airlines Logo
03:15 - 19:10
BKK
-
LHR
22h 55m1 stop
€551Shenzhen Airlines
Sun, 11 Jan - Fri, 16 Jan
Air India Logo
20:30 - 19:35
LHR
-
BKK
16h 05m1 stop
Air India Logo
20:50 - 11:05
BKK
-
LHR
21h 15m1 stop
€555Air India
Tue, 10 Feb - Thu, 5 Mar
Gulf Air Logo
10:35 - 12:30
LGW
-
SIN
17h 55m1 stop
Gulf Air Logo
20:00 - 06:20
SIN
-
LGW
18h 20m1 stop
€555Gulf Air
Wed, 18 Feb - Sat, 14 Mar
Gulf Air Logo
10:35 - 12:30
LGW
-
SIN
17h 55m1 stop
Gulf Air Logo
20:00 - 06:55
SIN
-
LGW
17h 55m1 stop
€559Gulf Air
Sun, 22 Mar - Tue, 31 Mar
KLM Logo
17:05 - 18:45
LHR
-
KUL
17h 40m2 stops
KLM Logo
23:50 - 09:00
KUL
-
LHR
17h 10m1 stop
€570KLM
Tue, 20 Jan - Sun, 25 Jan
KLM Logo
17:05 - 20:45
LHR
-
KUL
19h 40m2 stops
KLM Logo
23:50 - 13:50
KUL
-
LHR
22h 00m1 stop
€615KLM
Thu, 22 Jan - Mon, 26 Jan

KLM flights from London to Southeast Asia

Our best KLM deals on London to Southeast Asia flight tickets
KLM
20 Jan
LHR17:05London Heathrow
17h 40m
2 stops
KUL18:45Kuala Lumpur Intl
25 Jan
KUL23:50Kuala Lumpur Intl
17h 10m
1 stop
LHR09:00London Heathrow
€570
Find similar
KLM
22 Jan
LHR17:05London Heathrow
19h 40m
2 stops
KUL20:45Kuala Lumpur Intl
26 Jan
KUL23:50Kuala Lumpur Intl
22h 00m
1 stop
LHR13:50London Heathrow
€615
Find similar
KLM
16 Mar
LHR11:45London Heathrow
15h 20m
1 stop
BKK10:05Bangkok Suvarnabhumi
13 Jul
BKK12:05Bangkok Suvarnabhumi
14h 50m
1 stop
LHR20:55London Heathrow
€639
Find similar

China Southern flights from London to Southeast Asia

Our best China Southern deals on London to Southeast Asia flight tickets
China Southern
21 Jan
LHR22:00London Heathrow
20h 05m
1 stop
BKK01:05Bangkok Suvarnabhumi
28 Jan
BKK19:55Bangkok Suvarnabhumi
29h 00m
2 stops
LHR17:55London Heathrow
€524
Find similar
China Southern
15 Mar
LHR22:00London Heathrow
36h 05m
1 stop
BKK17:05Bangkok Suvarnabhumi
6 Apr
BKK03:00Bangkok Suvarnabhumi
21h 05m
2 stops
LHR18:05London Heathrow
€583
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London to Southeast Asia 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 13,528 searches. Data last updated 7 December 2025.
Use the filters below to find and compare flights from London to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 21/1

22:00-01:05

1 stop20h 05m

Bangkok Suvarnabhumi

Wed 28/1

19:55-17:55

2 stops29h 00m

€524

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 16/1

21:00-18:05

2 stops38h 05m

Bangkok Suvarnabhumi

Thu 29/1

19:10-17:35

2 stops29h 25m

€526

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 15/3

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Tue 7/4

12:10-20:00

1 stop37h 50m

€532

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 10/2

21:05-20:20

1 stop16h 15m

Bangkok Suvarnabhumi

Wed 4/3

20:50-11:05

1 stop21h 15m

€540

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 11/1

21:10-11:10

1 stop31h 00m

Bangkok Suvarnabhumi

Fri 16/1

03:15-19:10

1 stop22h 55m

€551

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 10/2

20:30-19:35

1 stop16h 05m

Bangkok Suvarnabhumi

Thu 5/3

20:50-11:05

1 stop21h 15m

€555

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Wed 18/2

10:35-12:30

1 stop17h 55m

Singapore Changi

Sat 14/3

20:00-06:20

1 stop18h 20m

€555

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Sun 22/3

10:35-12:30

1 stop17h 55m

Singapore Changi

Tue 31/3

20:00-06:55

1 stop17h 55m

€559

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Tue 20/1

17:05-18:45

2 stops17h 40m

Kuala Lumpur Intl

Sun 25/1

23:50-09:00

1 stop17h 10m

€570

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Thu 22/1

17:05-20:45

2 stops19h 40m

Kuala Lumpur Intl

Mon 26/1

23:50-13:50

1 stop22h 00m

€615

Flights are sorted by cheapest return flights first.

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

See travel insights to Southeast Asia from

How to get the cheapest flight ticket from London to Southeast Asia

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 Southeast Asia?

The cheapest month to fly to Southeast Asia from London is in May. Flight prices, which tend to average around €454, are often lower during this time because this is during the off-season. If you’re not able to fly to Southeast Asia in May, then September is your next best option. Flight prices from London to Southeast Asia during September average around €623.

What is the cheapest day to depart on your flight to Southeast Asia?

The cheapest day to depart from London to Southeast Asia is on a Wednesday. Travellers who choose to depart for Southeast Asia on a Wednesday will often find tickets for as low as €792. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €1,109. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

What is the cheapest time of day to depart on your flight to Southeast Asia?

Our most recent data shows that the best time of day to fly to Southeast Asia is in the afternoon. Flights from London to Southeast Asia during this time can be as low as €683. Flights to Southeast Asia are more costly in the evening, with an average ticket price of €856. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest London to Southeast Asia flight route?

Fly from London Gatwick to Bangkok Suvarnabhumi for the best London - Southeast Asia flight prices

How far in advance should I book a flight to Southeast Asia?

You are more likely to see cheaper flights to Southeast Asia from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around €807 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Southeast Asia from London for as low as €751 on momondo.

What cabin class options are available on London to Southeast Asia flights?

There are 3 cabin classes available to choose from on London to Southeast Asia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Southeast Asia flights?

No. A direct flight is the cheapest option for a flight between London to Southeast Asia.

Cheap London to Southeast Asia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Southeast Asia

Fastest flight time

12h 55m

Direct flights

Every day

Airports in Southeast Asia

1 airport
The fastest flight from London to Southeast Asia takes 12h 55m
Direct flights go from London to Southeast Asia every day.
There is 1 airport near Southeast Asia: Bangkok Suvarnabhumi (BKK)
Search flight deals

  • When did momondo last update prices for flights from London to Southeast Asia?

    Prices for flights from London to Southeast Asia refresh daily.

  • How old do you have to be to fly from London to Southeast Asia?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Southeast Asia.

  • What documentation or ID do you need to fly to Southeast Asia?

    The travel and health documents you'll need for your trip to Southeast Asia may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Southeast Asia. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London to Southeast Asia?

Best airlines flying from London to Southeast Asia

Compare and see reviews for airlines that fly from London to Southeast Asia with momondo
Airline
Rating
Free Cancellation
Price
Air ChinaPriceFrom €445Free CancellationRating
7.2
127 reviews
Search Air China flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Southeast Asia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Southeast Asia . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from London to Southeast Asia with flexible booking policies on momondo?

All flight searches from London to Southeast Asia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from London to Southeast Asia?

momondo provides multiple filters to help you find the best flight to Southeast Asia 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 Southeast Asia right now. Can momondo alert me if prices change?

Yes. momondo can track prices for London to Southeast Asia flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Southeast Asia 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
Tue 6/1
Tue 13/1
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Southeast Asia

Popular Cities in Southeast Asia

Popular flights according to clicks in the last 7 days on momondo
Flights to Dublinfrom €39
Flights to Bangkokfrom €475
Flights to Londonfrom €33
Flights to New Yorkfrom €258
Flights to Sao Paulofrom €610
Flights to Istanbulfrom €108
Flights to Manilafrom €527
Flights to Parisfrom €33
Flights to New Delhifrom €457
Flights to Copenhagenfrom €34
Flights to Dubaifrom €297
Flights to Lagosfrom €509