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Cheap flights from London Heathrow Airport to Southeast Asia from $547

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 18/5. 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

Find the cheapest flights from London Heathrow Airport to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
SAUDIA Logo
16:15 - 13:45
LHR
-
BKK
15h 30m
1 stop
SAUDIA Logo
15:25 - 07:30
BKK
-
LHR
22h 05m
1 stop
$835SAUDIA
Fri, 5 Jun - Sun, 14 Jun
SAUDIA Logo
16:15 - 13:45
LHR
-
BKK
15h 30m
1 stop
SAUDIA Logo
15:25 - 07:30
BKK
-
LHR
22h 05m
1 stop
$837SAUDIA
Fri, 5 Jun - Tue, 9 Jun
SAUDIA Logo
22:10 - 00:05
LHR
-
BKK
19h 55m
1 stop
SAUDIA Logo
15:25 - 07:30
BKK
-
LHR
22h 05m
1 stop
$838SAUDIA
Sun, 10 May - Sat, 13 Jun
Hainan Airlines Logo
22:00 - 11:25
LHR
-
KUL
30h 25m
2 stops
Hainan Airlines Logo
21:05 - 19:30
KUL
-
LHR
29h 25m
2 stops
$862Hainan Airlines
Mon, 1 Jun - Thu, 11 Jun
Shenzhen Airlines Logo
22:05 - 02:05
LHR
-
KUL
21h 00m
1 stop
Shenzhen Airlines Logo
04:20 - 19:10
KUL
-
LHR
22h 50m
1 stop
$894Shenzhen Airlines
Mon, 28 Sep - Mon, 26 Oct
Shenzhen Airlines Logo
22:05 - 02:05
LHR
-
KUL
21h 00m
1 stop
Shenzhen Airlines Logo
20:30 - 19:10
KUL
-
LHR
30h 40m
1 stop
$896Shenzhen Airlines
Mon, 28 Sep - Tue, 27 Oct
Multiple Airlines Logo
16:15 - 19:40
LHR
-
HKT
21h 25m
2 stops
Multiple Airlines Logo
10:15 - 07:30
HKT
-
LHR
27h 15m
2 stops
$945Multiple Airlines
Wed, 17 Jun - Sun, 28 Jun
Multiple Airlines Logo
10:00 - 16:50
LHR
-
HKT
24h 50m
2 stops
Multiple Airlines Logo
07:30 - 07:30
HKT
-
LHR
30h 00m
2 stops
$946Multiple Airlines
Sat, 6 Jun - Sat, 13 Jun
Gulf Air Logo
10:00 - 12:45
LHR
-
SIN
19h 45m
1 stop
Gulf Air Logo
20:00 - 06:55
SIN
-
LHR
17h 55m
1 stop
$998Gulf Air
Mon, 1 Jun - Thu, 11 Jun
Gulf Air Logo
22:05 - 12:45
LHR
-
SIN
31h 40m
1 stop
Gulf Air Logo
20:00 - 15:20
SIN
-
LHR
26h 20m
1 stop
$1,023Gulf Air
Mon, 15 Jun - Mon, 22 Jun

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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
13 Sept
LHR21:20London Heathrow
17h 35m
1 stop
BKK20:55Bangkok Suvarnabhumi
4 Dec
BKK07:50Bangkok Suvarnabhumi
40h 40m
2 stops
LHR17:30London Heathrow
$887
China Eastern
16 Sept
LHR21:20London Heathrow
21h 20m
1 stop
BKK00:40Bangkok Suvarnabhumi
15 Dec
BKK15:55Bangkok Suvarnabhumi
32h 35m
2 stops
LHR17:30London Heathrow
$889
China Eastern
26 Apr
LHR21:20London Heathrow
21h 20m
1 stop
BKK00:40Bangkok Suvarnabhumi
13 May
BKK21:55Bangkok Suvarnabhumi
26h 45m
1 stop
LHR18:40London Heathrow
$985

SAUDIA flights from London Heathrow Airport to Southeast Asia

Our best SAUDIA deals on London Heathrow Airport to Southeast Asia flight tickets
SAUDIA
5 June
LHR16:15London Heathrow
15h 30m
1 stop
BKK13:45Bangkok Suvarnabhumi
14 June
BKK15:25Bangkok Suvarnabhumi
22h 05m
1 stop
LHR07:30London Heathrow
$835
SAUDIA
5 June
LHR16:15London Heathrow
15h 30m
1 stop
BKK13:45Bangkok Suvarnabhumi
9 June
BKK15:25Bangkok Suvarnabhumi
22h 05m
1 stop
LHR07:30London Heathrow
$837
SAUDIA
10 May
LHR22:10London Heathrow
19h 55m
1 stop
BKK00:05Bangkok Suvarnabhumi
13 June
BKK15:25Bangkok Suvarnabhumi
22h 05m
1 stop
LHR07:30London Heathrow
$838

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 24 April 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
Fastest return journey

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 5/6

16:15-13:45

1 stop15h 30m

Bangkok Suvarnabhumi

Sun 14/6

15:25-07:30

1 stop22h 05m

$835

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 5/6

16:15-13:45

1 stop15h 30m

Bangkok Suvarnabhumi

Tue 9/6

15:25-07:30

1 stop22h 05m

$837

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 10/5

22:10-00:05

1 stop19h 55m

Bangkok Suvarnabhumi

Sat 13/6

15:25-07:30

1 stop22h 05m

$838

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 1/6

22:00-11:25

2 stops30h 25m

Kuala Lumpur Intl

Thu 11/6

21:05-19:30

2 stops29h 25m

$862

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 28/9

22:05-02:05

1 stop21h 00m

Kuala Lumpur Intl

Mon 26/10

04:20-19:10

1 stop22h 50m

$894

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 28/9

22:05-02:05

1 stop21h 00m

Kuala Lumpur Intl

Tue 27/10

20:30-19:10

1 stop30h 40m

$896

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Wed 17/6

16:15-19:40

2 stops21h 25m

Phuket City

Sun 28/6

10:15-07:30

2 stops27h 15m

$945

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Sat 6/6

10:00-16:50

2 stops24h 50m

Phuket City

Sat 13/6

07:30-07:30

2 stops30h 00m

$946

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 1/6

10:00-12:45

1 stop19h 45m

Singapore Changi

Thu 11/6

20:00-06:55

1 stop17h 55m

$998

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 15/6

22:05-12:45

1 stop31h 40m

Singapore Changi

Mon 22/6

20:00-15:20

1 stop26h 20m

$1,023

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 $1,223, are often lower during this time because this is during the off-season. The month of May is another great option to travel to Southeast Asia, with average flight prices from London Heathrow Airport averaging around $1,318.

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

Fly from London Heathrow to Singapore Changi 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 $1,514 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 $1,380 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 55m

Direct flights

Every day

Airports in Southeast Asia

295 airports
The fastest flight from London Heathrow Airport to Southeast Asia takes 11h 55m
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 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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