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Cheap flights from London to Southeast Asia from €336

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 15/1. 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

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Find the cheapest flights from London to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
Air China Logo
17:40 - 18:05
LHR
-
BKK
17h 25m1 stop
Air China Logo
01:30 - 15:55
BKK
-
LHR
21h 25m1 stop
€492Air China
Wed, 11 Mar - Fri, 27 Mar
Air China Logo
17:40 - 18:05
LHR
-
BKK
17h 25m1 stop
Air China Logo
01:30 - 15:55
BKK
-
LHR
21h 25m1 stop
€493Air China
Sun, 8 Mar - Wed, 25 Mar
China Eastern Logo
21:00 - 22:25
LHR
-
BKK
18h 25m1 stop
China Eastern Logo
05:05 - 17:40
BKK
-
LHR
19h 35m1 stop
€503China Eastern
Mon, 9 Mar - Sun, 29 Mar
China Eastern Logo
21:00 - 22:25
LHR
-
BKK
18h 25m1 stop
China Eastern Logo
05:05 - 18:40
BKK
-
LHR
19h 35m1 stop
€504China Eastern
Wed, 11 Mar - Mon, 30 Mar
Multiple Airlines Logo
21:00 - 22:25
LHR
-
BKK
18h 25m1 stop
Multiple Airlines Logo
19:10 - 17:35
BKK
-
LHR
29h 25m2 stops
€505Multiple Airlines
Mon, 12 Jan - Thu, 29 Jan
Shenzhen Airlines Logo
21:10 - 11:10
LHR
-
BKK
31h 00m1 stop
Shenzhen Airlines Logo
03:15 - 19:10
BKK
-
LHR
22h 55m1 stop
€509Shenzhen Airlines
Sun, 1 Mar - Tue, 17 Mar
Shenzhen Airlines Logo
21:10 - 02:15
LHR
-
BKK
22h 05m1 stop
Shenzhen Airlines Logo
03:15 - 19:50
BKK
-
LHR
22h 35m1 stop
€510Shenzhen Airlines
Wed, 18 Mar - Sun, 29 Mar
Multiple Airlines Logo
14:25 - 03:20
LGW
-
SIN
28h 55m1 stop
Multiple Airlines Logo
02:45 - 21:45
SIN
-
LGW
27h 00m1 stop
€541Multiple Airlines
Sun, 1 Mar - Thu, 12 Mar
Gulf Air Logo
11:25 - 12:20
LGW
-
SIN
17h 55m1 stop
Gulf Air Logo
20:00 - 06:55
SIN
-
LGW
17h 55m1 stop
€545Gulf Air
Sun, 26 Apr - Thu, 7 May
Gulf Air Logo
10:35 - 12:30
LGW
-
SIN
17h 55m1 stop
Gulf Air Logo
20:00 - 06:30
SIN
-
LGW
18h 30m1 stop
€554Gulf Air
Sun, 11 Jan - Tue, 3 Feb

China Eastern flights from London to Southeast Asia

Our best China Eastern deals on London to Southeast Asia flight tickets
China Eastern
9 Mar
LHR21:00London Heathrow
18h 25m
1 stop
BKK22:25Bangkok Suvarnabhumi
29 Mar
BKK05:05Bangkok Suvarnabhumi
19h 35m
1 stop
LHR17:40London Heathrow
€503
Find similar
China Eastern
11 Mar
LHR21:00London Heathrow
18h 25m
1 stop
BKK22:25Bangkok Suvarnabhumi
30 Mar
BKK05:05Bangkok Suvarnabhumi
19h 35m
1 stop
LHR18:40London Heathrow
€504
Find similar
China Eastern
22 Jan
LGW10:30London Gatwick
22h 54m
1 stop
SIN17:24Singapore Changi
3 Feb
SIN00:25Singapore Changi
21h 35m
1 stop
LGW14:00London Gatwick
€580
Find similar

Shenzhen Airlines flights from London to Southeast Asia

Our best Shenzhen Airlines deals on London to Southeast Asia flight tickets
Shenzhen Airlines
1 Mar
LHR21:10London Heathrow
31h 00m
1 stop
BKK11:10Bangkok Suvarnabhumi
17 Mar
BKK03:15Bangkok Suvarnabhumi
22h 55m
1 stop
LHR19:10London Heathrow
€509
Find similar
Shenzhen Airlines
18 Mar
LHR21:10London Heathrow
22h 05m
1 stop
BKK02:15Bangkok Suvarnabhumi
29 Mar
BKK03:15Bangkok Suvarnabhumi
22h 35m
1 stop
LHR19:50London Heathrow
€510
Find similar
Shenzhen Airlines
17 Jan
LHR21:10London Heathrow
31h 00m
1 stop
BKK11:10Bangkok Suvarnabhumi
12 Feb
BKK12:10Bangkok Suvarnabhumi
38h 00m
1 stop
LHR19:10London Heathrow
€550
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 23 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 11/3

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Fri 27/3

01:30-15:55

1 stop21h 25m

€492

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 8/3

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Wed 25/3

01:30-15:55

1 stop21h 25m

€493

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 9/3

21:00-22:25

1 stop18h 25m

Bangkok Suvarnabhumi

Sun 29/3

05:05-17:40

1 stop19h 35m

€503

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 11/3

21:00-22:25

1 stop18h 25m

Bangkok Suvarnabhumi

Mon 30/3

05:05-18:40

1 stop19h 35m

€504

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 12/1

21:00-22:25

1 stop18h 25m

Bangkok Suvarnabhumi

Thu 29/1

19:10-17:35

2 stops29h 25m

€505

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 1/3

21:10-11:10

1 stop31h 00m

Bangkok Suvarnabhumi

Tue 17/3

03:15-19:10

1 stop22h 55m

€509

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 18/3

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Sun 29/3

03:15-19:50

1 stop22h 35m

€510

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Sun 1/3

14:25-03:20

1 stop28h 55m

Singapore Changi

Thu 12/3

02:45-21:45

1 stop27h 00m

€541

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Sun 26/4

11:25-12:20

1 stop17h 55m

Singapore Changi

Thu 7/5

20:00-06:55

1 stop17h 55m

€545

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Sun 11/1

10:35-12:30

1 stop17h 55m

Singapore Changi

Tue 3/2

20:00-06:30

1 stop18h 30m

€554

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 €451, 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 €618.

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 €785. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around €1,135. 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 €677. Flights to Southeast Asia are more costly in the evening, with an average ticket price of €849. 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 €801 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 €746 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

11h 40m

Direct flights

Every day

Airports in Southeast Asia

295 airports
The fastest flight from London to Southeast Asia takes 11h 40m
Direct flights go from London to Southeast Asia every day.
There are 295 airports in Southeast Asia. From London there are direct flights to 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
132 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

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