Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from London to Southeast Asia from €343

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 21/9. 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 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

Logo
20:25 - 01:20LHR-MNL
20h 55m2 stops
Logo
02:05 - 17:50MNL-LHR
47h 45m2 stops
€510
Find Deal
Tue, 25 Nov - Mon, 19 Jan
Logo
20:25 - 01:20LHR-MNL
20h 55m2 stops
Logo
02:05 - 17:50MNL-LHR
23h 45m2 stops
€512
Find Deal
Tue, 25 Nov - Fri, 23 Jan
Shenzhen Airlines Logo
21:10 - 11:10LHR-BKK
31h 00m1 stop
Shenzhen Airlines Logo
03:15 - 19:10BKK-LHR
22h 55m1 stop
€515Shenzhen Airlines
Find Deal
Sun, 2 Nov - Sat, 29 Nov
Shenzhen Airlines Logo
21:10 - 18:30LHR-BKK
38h 20m1 stop
Shenzhen Airlines Logo
19:30 - 19:10BKK-LHR
30h 40m1 stop
€515Shenzhen Airlines
Find Deal
Fri, 7 Nov - Thu, 27 Nov
China Southern Logo
22:00 - 17:55LHR-BKK
36h 55m1 stop
China Southern Logo
08:20 - 18:35BKK-LHR
17h 15m1 stop
€534China Southern
Find Deal
Wed, 5 Nov - Wed, 3 Dec
Air China Logo
12:35 - 21:55LGW-SIN
26h 20m1 stop
Air China Logo
17:50 - 06:55SIN-LGW
21h 05m1 stop
€544Air China
Find Deal
Tue, 14 Oct - Mon, 3 Nov
Austrian Airlines Logo
09:05 - 12:20LHR-BKK
20h 15m1 stop
Austrian Airlines Logo
23:50 - 08:20BKK-LHR
15h 30m1 stop
€545Austrian Airlines
Find Deal
Fri, 6 Mar - Wed, 18 Mar
Austrian Airlines Logo
13:55 - 15:30LHR-BKK
18h 35m1 stop
Austrian Airlines Logo
14:00 - 21:40BKK-LHR
14h 40m1 stop
€549Austrian Airlines
Find Deal
Sun, 8 Feb - Mon, 16 Feb
Air China Logo
20:25 - 00:10LHR-BKK
20h 45m1 stop
Air China Logo
17:55 - 17:50BKK-LHR
30h 55m2 stops
€565Air China
Find Deal
Tue, 18 Nov - Tue, 24 Mar
China Southern Logo
17:15 - 22:30LHR-BKK
22h 15m2 stops
China Southern Logo
08:20 - 18:35BKK-LHR
17h 15m1 stop
€613China Southern
Find Deal
Wed, 5 Nov - Wed, 3 Dec

Shenzhen Airlines flights from London to Southeast Asia

Our best Shenzhen Airlines deals on London to Southeast Asia flight tickets
Shenzhen Airlines
2 Nov
LHR21:10London Heathrow
31h 00m
1 stop
BKK11:10Bangkok Suvarnabhumi
29 Nov
BKK03:15Bangkok Suvarnabhumi
22h 55m
1 stop
LHR19:10London Heathrow
€515
Find similar
Shenzhen Airlines
7 Nov
LHR21:10London Heathrow
38h 20m
1 stop
BKK18:30Bangkok Suvarnabhumi
30 Nov
BKK19:30Bangkok Suvarnabhumi
30h 40m
1 stop
LHR19:10London Heathrow
€515
Find similar
Shenzhen Airlines
26 Sept
LHR22:05London Heathrow
22h 10m
1 stop
BKK02:15Bangkok Suvarnabhumi
21 Oct
BKK03:15Bangkok Suvarnabhumi
22h 45m
1 stop
LHR20:00London Heathrow
€540
Find similar

Etihad Airways flights from London to Southeast Asia

Our best Etihad Airways deals on London to Southeast Asia flight tickets
Etihad Airways
22 Sept
LHR14:45London Heathrow
27h 10m
1 stop
BKK23:55Bangkok Suvarnabhumi
5 Oct
BKK02:55Bangkok Suvarnabhumi
18h 20m
1 stop
LHR15:15London Heathrow
€526
Find similar
Etihad Airways
29 Sept
LHR14:45London Heathrow
27h 10m
1 stop
BKK23:55Bangkok Suvarnabhumi
5 Nov
BKK02:55Bangkok Suvarnabhumi
18h 35m
1 stop
LHR14:30London Heathrow
€579
Find similar
Etihad Airways
13 Nov
LHR13:55London Heathrow
26h 25m
1 stop
BKK23:20Bangkok Suvarnabhumi
9 Mar
BKK02:55Bangkok Suvarnabhumi
18h 35m
1 stop
LHR14:30London Heathrow
€580
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 15 September 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

LondonManila

LHR - MNL

LHRMNL

London Heathrow

Tue 25/11

20:25-01:20

2 stops20h 55m

Manila Ninoy Aquino Intl

Mon 19/1

02:05-17:50

2 stops47h 45m

€510

LondonManila

LHR - MNL

LHRMNL

London Heathrow

Tue 25/11

20:25-01:20

2 stops20h 55m

Manila Ninoy Aquino Intl

Fri 23/1

02:05-17:50

2 stops23h 45m

€512

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 2/11

21:10-11:10

1 stop31h 00m

Bangkok Suvarnabhumi

Sat 29/11

03:15-19:10

1 stop22h 55m

€515

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 7/11

21:10-18:30

1 stop38h 20m

Bangkok Suvarnabhumi

Thu 27/11

19:30-19:10

1 stop30h 40m

€515

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 5/11

22:00-17:55

1 stop36h 55m

Bangkok Suvarnabhumi

Wed 3/12

08:20-18:35

1 stop17h 15m

€534

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Tue 14/10

12:35-21:55

1 stop26h 20m

Singapore Changi

Mon 3/11

17:50-06:55

1 stop21h 05m

€544

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 6/3

09:05-12:20

1 stop20h 15m

Bangkok Suvarnabhumi

Wed 18/3

23:50-08:20

1 stop15h 30m

€545

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 8/2

13:55-15:30

1 stop18h 35m

Bangkok Suvarnabhumi

Mon 16/2

14:00-21:40

1 stop14h 40m

€549

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 18/11

20:25-00:10

1 stop20h 45m

Bangkok Suvarnabhumi

Tue 24/3

17:55-17:50

2 stops30h 55m

€565

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 5/11

17:15-22:30

2 stops22h 15m

Bangkok Suvarnabhumi

Wed 3/12

08:20-18:35

1 stop17h 15m

€613

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 €461, 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 €625.

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 €782. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €1,152. 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 €678. Flights to Southeast Asia are more costly in the evening, with an average ticket price of €914. 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 Heathrow 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 €805 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 €741 on momondo.

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

There are 2 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

11h 25m

Direct flights

Every day

Airports in Southeast Asia

1 airport
The fastest flight from London to Southeast Asia takes 11h 25m
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 many operators does momondo search for flights from London to Southeast Asia?

  • 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 €441Free CancellationRating
7.2
99 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
Wed 15/10
Wed 22/10
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 €40
Flights to Bangkokfrom €458
Flights to Londonfrom €32
Flights to New Yorkfrom €228
Flights to Sao Paulofrom €608
Flights to Istanbulfrom €125
Flights to New Delhifrom €422
Flights to Parisfrom €44
Flights to Johannesburgfrom €567
Flights to Dubaifrom €279
Flights to Lagosfrom €485
Flights to Lisbonfrom €60