Cheap flights from London to Southeast Asia from €344

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 26/10. 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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Cheap return flights

Enter your travel dates to find the best prices.
China Southern Logo
17:15 - 01:05LHR-BKK
24h 50m2 stops
China Southern Logo
08:20 - 18:35BKK-LHR
17h 15m1 stop
€505China Southern
Find Deal
Sun, 23 Nov - Mon, 8 Dec
Shenzhen Airlines Logo
21:10 - 02:15LHR-BKK
22h 05m1 stop
Shenzhen Airlines Logo
03:15 - 19:10BKK-LHR
22h 55m1 stop
€512Shenzhen Airlines
Find Deal
Sat, 29 Nov - Tue, 9 Dec
Hainan Airlines Logo
21:15 - 00:20LHR-BKK
20h 05m1 stop
Hainan Airlines Logo
01:35 - 17:35BKK-LHR
23h 00m2 stops
€513Hainan Airlines
Find Deal
Sun, 1 Feb - Thu, 5 Mar
Air China Logo
17:40 - 18:05LHR-BKK
17h 25m1 stop
Air China Logo
19:30 - 17:50BKK-LHR
29h 20m1 stop
€526Air China
Find Deal
Thu, 27 Nov - Thu, 4 Dec
Hainan Airlines Logo
21:15 - 00:20LHR-BKK
20h 05m1 stop
Hainan Airlines Logo
01:35 - 17:35BKK-LHR
23h 00m1 stop
€532Hainan Airlines
Find Deal
Sun, 1 Feb - Thu, 5 Mar
Air China Logo
17:40 - 18:05LHR-BKK
17h 25m1 stop
Air China Logo
01:30 - 15:55BKK-LHR
21h 25m1 stop
€532Air China
Find Deal
Sun, 9 Nov - Sun, 23 Nov
SWISS Logo
18:40 - 18:00LGW-SIN
15h 20m1 stop
SWISS Logo
00:05 - 17:50SIN-LGW
25h 45m1 stop
€538SWISS
Find Deal
Thu, 19 Mar - Sun, 22 Mar
Multiple Airlines Logo
14:35 - 03:20LGW-SIN
28h 45m1 stop
Multiple Airlines Logo
02:45 - 21:25SIN-LGW
26h 40m1 stop
€540Multiple Airlines
Find Deal
Sun, 11 Jan - Thu, 29 Jan
Multiple Airlines Logo
20:25 - 00:40LHR-BKK
21h 15m2 stops
Multiple Airlines Logo
14:15 - 15:55BKK-LHR
32h 40m2 stops
€560Multiple Airlines
Find Deal
Sun, 9 Nov - Mon, 24 Nov
SWISS Logo
18:40 - 18:00LGW-SIN
15h 20m1 stop
SWISS Logo
00:05 - 17:50SIN-LGW
25h 45m1 stop
€573SWISS
Find Deal
Thu, 19 Mar - Sun, 22 Mar

China Southern flights from London to Southeast Asia

Our best China Southern deals on London to Southeast Asia flight tickets
China Southern
23 Nov
LHR17:15London Heathrow
24h 50m
2 stops
BKK01:05Bangkok Suvarnabhumi
8 Dec
BKK08:20Bangkok Suvarnabhumi
17h 15m
1 stop
LHR18:35London Heathrow
China Southern
1 Feb
LHR22:00London Heathrow
17h 30m
1 stop
BKK22:30Bangkok Suvarnabhumi
6 Mar
BKK18:55Bangkok Suvarnabhumi
30h 40m
1 stop
LHR18:35London Heathrow
China Southern
26 Nov
LHR17:15London Heathrow
33h 55m
2 stops
BKK10:10Bangkok Suvarnabhumi
3 Dec
BKK18:55Bangkok Suvarnabhumi
30h 40m
1 stop
LHR18:35London Heathrow

Shenzhen Airlines flights from London to Southeast Asia

Our best Shenzhen Airlines deals on London to Southeast Asia flight tickets
Shenzhen Airlines
29 Nov
LHR21:10London Heathrow
22h 05m
1 stop
BKK02:15Bangkok Suvarnabhumi
9 Dec
BKK03:15Bangkok Suvarnabhumi
22h 55m
1 stop
LHR19:10London Heathrow
Shenzhen Airlines
26 Nov
LHR21:10London Heathrow
22h 05m
1 stop
BKK02:15Bangkok Suvarnabhumi
14 Dec
BKK03:15Bangkok Suvarnabhumi
22h 55m
1 stop
LHR19:10London Heathrow
Shenzhen Airlines
7 Nov
LHR21:10London Heathrow
38h 20m
1 stop
BKK18:30Bangkok Suvarnabhumi
29 Nov
BKK19:30Bangkok Suvarnabhumi
30h 40m
1 stop
LHR19:10London Heathrow

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 14 October 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

Sun 23/11

17:15-01:05

2 stops24h 50m

Bangkok Suvarnabhumi

Mon 8/12

08:20-18:35

1 stop17h 15m

€505

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 29/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Tue 9/12

03:15-19:10

1 stop22h 55m

€512

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 1/2

21:15-00:20

1 stop20h 05m

Bangkok Suvarnabhumi

Thu 5/3

01:35-17:35

2 stops23h 00m

€513

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 27/11

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Thu 4/12

19:30-17:50

1 stop29h 20m

€526

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 1/2

21:15-00:20

1 stop20h 05m

Bangkok Suvarnabhumi

Thu 5/3

01:35-17:35

1 stop23h 00m

€532

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 9/11

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Sun 23/11

01:30-15:55

1 stop21h 25m

€532

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Thu 19/3

18:40-18:00

1 stop15h 20m

Singapore Changi

Sun 22/3

00:05-17:50

1 stop25h 45m

€538

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Sun 11/1

14:35-03:20

1 stop28h 45m

Singapore Changi

Thu 29/1

02:45-21:25

1 stop26h 40m

€540

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 9/11

20:25-00:40

2 stops21h 15m

Bangkok Suvarnabhumi

Mon 24/11

14:15-15:55

2 stops32h 40m

€560

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Thu 19/3

18:40-18:00

1 stop15h 20m

Singapore Changi

Sun 22/3

00:05-17:50

1 stop25h 45m

€573

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 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 €465, 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 €629.

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 €796. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €1,167. 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 €686. Flights to Southeast Asia are more costly in the evening, with an average ticket price of €925. 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 €815 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 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)
  • 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 €447Free CancellationRating
7.2
114 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.

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1 adult
Thu 13/11
Thu 20/11

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