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Cheap flights from London Heathrow Airport to Southeast Asia from $555

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 Heathrow Airport to Southeast Asia departing on 16/9. 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
1 adult, Economy, 0 bags

Find the cheapest flights from London Heathrow Airport to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
Shenzhen Airlines Logo
21:10 - 02:15
LHR
-
BKK
22h 05m
1 stop
Shenzhen Airlines Logo
03:15 - 19:10
BKK
-
LHR
22h 55m
1 stop
$885Shenzhen Airlines
Mon, 2 Nov - Fri, 13 Nov
Shenzhen Airlines Logo
21:10 - 11:10
LHR
-
BKK
31h 00m
1 stop
Shenzhen Airlines Logo
12:10 - 19:10
BKK
-
LHR
38h 00m
1 stop
$886Shenzhen Airlines
Mon, 2 Nov - Thu, 26 Nov
Shenzhen Airlines Logo
21:10 - 02:15
LHR
-
BKK
22h 05m
1 stop
Shenzhen Airlines Logo
03:15 - 19:10
BKK
-
LHR
22h 55m
1 stop
$887Shenzhen Airlines
Mon, 2 Nov - Fri, 27 Nov
Hainan Airlines Logo
19:45 - 10:05
LHR
-
BKK
31h 20m
1 stop
Hainan Airlines Logo
19:10 - 16:20
BKK
-
LHR
28h 10m
1 stop
$894Hainan Airlines
Wed, 4 Nov - Tue, 1 Dec
Air China Logo
21:35 - 12:30
LHR
-
BKK
31h 55m
1 stop
Air China Logo
13:50 - 19:40
BKK
-
LHR
36h 50m
1 stop
$900Air China
Sat, 31 Oct - Wed, 2 Dec
China Eastern Logo
21:00 - 14:55
LHR
-
BKK
58h 55m
3 stops
China Eastern Logo
01:55 - 17:30
BKK
-
LHR
22h 35m
1 stop
$991China Eastern
Wed, 4 Nov - Sat, 7 Nov
Air China Logo
21:35 - 12:30
LHR
-
BKK
31h 55m
1 stop
Air China Logo
01:30 - 17:50
BKK
-
LHR
23h 20m
1 stop
$1,000Air China
Tue, 3 Nov - Sun, 29 Nov
China Eastern Logo
21:00 - 14:55
LHR
-
BKK
34h 55m
2 stops
China Eastern Logo
18:15 - 17:30
BKK
-
LHR
30h 15m
2 stops
$1,001China Eastern
Wed, 2 Dec - Fri, 4 Dec
Multiple Airlines Logo
18:40 - 18:05
LHR
-
SIN
15h 25m
1 stop
Multiple Airlines Logo
23:55 - 08:45
SIN
-
LHR
16h 50m
1 stop
$1,106Multiple Airlines
Tue, 1 Dec - Mon, 14 Dec
Multiple Airlines Logo
22:00 - 11:25
LHR
-
KUL
30h 25m
2 stops
Multiple Airlines Logo
09:50 - 18:45
KUL
-
LHR
15h 55m
1 stop
$1,106Multiple Airlines
Mon, 6 Jul - Thu, 16 Jul

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Shenzhen Airlines flights from London Heathrow Airport to Southeast Asia

Our best Shenzhen Airlines deals on London Heathrow Airport to Southeast Asia flight tickets
Shenzhen Airlines
2 Nov
LHR21:10London Heathrow
22h 05m
1 stop
BKK02:15Bangkok Suvarnabhumi
13 Nov
BKK03:15Bangkok Suvarnabhumi
22h 55m
1 stop
LHR19:10London Heathrow
$885
Shenzhen Airlines
2 Nov
LHR21:10London Heathrow
31h 00m
1 stop
BKK11:10Bangkok Suvarnabhumi
26 Nov
BKK12:10Bangkok Suvarnabhumi
38h 00m
1 stop
LHR19:10London Heathrow
$886
Shenzhen Airlines
2 Nov
LHR21:10London Heathrow
22h 05m
1 stop
BKK02:15Bangkok Suvarnabhumi
1 Dec
BKK03:15Bangkok Suvarnabhumi
22h 55m
1 stop
LHR19:10London Heathrow
$887

China Eastern flights from London Heathrow Airport to Southeast Asia

Our best China Eastern deals on London Heathrow Airport to Southeast Asia flight tickets
China Eastern
4 Nov
LHR21:00London Heathrow
58h 55m
3 stops
BKK14:55Bangkok Suvarnabhumi
7 Nov
BKK01:55Bangkok Suvarnabhumi
22h 35m
1 stop
LHR17:30London Heathrow
$991
China Eastern
2 Dec
LHR21:00London Heathrow
34h 55m
2 stops
BKK14:55Bangkok Suvarnabhumi
4 Dec
BKK18:15Bangkok Suvarnabhumi
30h 15m
2 stops
LHR17:30London Heathrow
$1,001
China Eastern
8 Sept
LHR21:20London Heathrow
17h 35m
1 stop
BKK20:55Bangkok Suvarnabhumi
8 Dec
BKK13:35Bangkok Suvarnabhumi
34h 55m
1 stop
LHR17:30London Heathrow
$1,005

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport 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 78,305 searches. Data last updated 13 June 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 2/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Fri 13/11

03:15-19:10

1 stop22h 55m

$885

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 2/11

21:10-11:10

1 stop31h 00m

Bangkok Suvarnabhumi

Thu 26/11

12:10-19:10

1 stop38h 00m

$886

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 2/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Fri 27/11

03:15-19:10

1 stop22h 55m

$887

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 4/11

19:45-10:05

1 stop31h 20m

Bangkok Suvarnabhumi

Tue 1/12

19:10-16:20

1 stop28h 10m

$894

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 31/10

21:35-12:30

1 stop31h 55m

Bangkok Suvarnabhumi

Wed 2/12

13:50-19:40

1 stop36h 50m

$900

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 4/11

21:00-14:55

3 stops58h 55m

Bangkok Suvarnabhumi

Sat 7/11

01:55-17:30

1 stop22h 35m

$991

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 3/11

21:35-12:30

1 stop31h 55m

Bangkok Suvarnabhumi

Sun 29/11

01:30-17:50

1 stop23h 20m

$1,000

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 2/12

21:00-14:55

2 stops34h 55m

Bangkok Suvarnabhumi

Fri 4/12

18:15-17:30

2 stops30h 15m

$1,001
Fastest return journey

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 1/12

18:40-18:05

1 stop15h 25m

Singapore Changi

Mon 14/12

23:55-08:45

1 stop16h 50m

$1,106

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 6/7

22:00-11:25

2 stops30h 25m

Kuala Lumpur Intl

Thu 16/7

09:50-18:45

1 stop15h 55m

$1,106

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 Heathrow Airport 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 Heathrow Airport is in November. Flight prices, which tend to average around $1,200, are often lower during this time because this is during the off-season. The month of September is another great option to travel to Southeast Asia, with average flight prices from London Heathrow Airport averaging around $1,234.

What is the cheapest London Heathrow to Southeast Asia flight route?

Fly from London Heathrow to Phuket City for the best London Heathrow - Southeast Asia flight prices

How far in advance should I book a flight from London Heathrow Airport to Southeast Asia?

You are more likely to see cheaper flights to Southeast Asia from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around $1,536 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 Heathrow Airport for as low as $1,417 on momondo.

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

There are 4 cabin classes available to choose from on London Heathrow Airport 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 Heathrow Airport to Southeast Asia flights?

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

Cheap London Heathrow Airport to Southeast Asia flight deals and tips

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

Fastest flight time

11h 25m

Direct flights

Every day

Airports in Southeast Asia

295 airports
The fastest flight from London Heathrow Airport to Southeast Asia takes 11h 25m
Direct flights go from London Heathrow Airport to Southeast Asia every day.
There are 295 airports in Southeast Asia. From London Heathrow Airport there are direct flights to Bangkok Suvarnabhumi (BKK).
Search flight deals

Frequently asked questions about flying from London Heathrow Airport to Southeast Asia

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

    Prices for flights from London Heathrow Airport to Southeast Asia are updated daily.

  • How many operators does momondo search for flights from London Heathrow Airport to Southeast Asia?

  • How old do you have to be to fly from London Heathrow Airport 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 Heathrow Airport to Southeast Asia.

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

    The travel and health documents required for your trip to Southeast Asia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Southeast Asia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Southeast Asia from London.

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

Yes. momondo enables you to select and highlight flights to Southeast Asia from London with this policy.

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?

Price alerts on flights to Southeast Asia from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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