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Cheap flights from London Heathrow Airport to Southeast Asia from $520

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 17/6. 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

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Find the cheapest flights from London Heathrow Airport to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
China Eastern Logo
21:00 - 22:25
LHR
-
BKK
18h 25m
1 stop
China Eastern Logo
05:45 - 17:30
BKK
-
LHR
18h 45m
1 stop
$806China Eastern
Wed, 18 Feb - Thu, 5 Mar
China Eastern Logo
21:00 - 22:25
LHR
-
BKK
18h 25m
1 stop
China Eastern Logo
19:55 - 17:30
BKK
-
LHR
28h 35m
1 stop
$810China Eastern
Wed, 18 Feb - Mon, 16 Mar
China Eastern Logo
21:00 - 22:45
LHR
-
HKT
18h 45m
1 stop
China Eastern Logo
23:05 - 17:30
HKT
-
LHR
25h 25m
1 stop
$812China Eastern
Wed, 18 Feb - Mon, 9 Mar
SWISS Logo
18:40 - 18:00
LHR
-
SIN
15h 20m
1 stop
SWISS Logo
00:05 - 08:05
SIN
-
LHR
16h 00m
1 stop
$941SWISS
Thu, 12 Mar - Sun, 22 Mar
Lufthansa Logo
17:50 - 16:35
LHR
-
SIN
15h 45m
1 stop
Lufthansa Logo
23:40 - 08:40
SIN
-
LHR
16h 00m
1 stop
$946Lufthansa
Wed, 15 Apr - Mon, 25 May
Shenzhen Airlines Logo
21:10 - 12:10
LHR
-
SIN
31h 00m
1 stop
Shenzhen Airlines Logo
18:30 - 19:10
SIN
-
LHR
32h 40m
1 stop
$949Shenzhen Airlines
Fri, 6 Mar - Tue, 10 Mar
SWISS Logo
20:05 - 18:00
LHR
-
SIN
37h 55m
1 stop
SWISS Logo
00:05 - 13:40
SIN
-
LHR
21h 35m
2 stops
$959SWISS
Thu, 5 Mar - Tue, 17 Mar
Shenzhen Airlines Logo
21:10 - 12:10
LHR
-
SIN
31h 00m
1 stop
Shenzhen Airlines Logo
18:30 - 19:10
SIN
-
LHR
32h 40m
1 stop
$961Shenzhen Airlines
Wed, 11 Mar - Sun, 15 Mar
Air India Logo
09:45 - 13:35
LHR
-
DPS
20h 50m
1 stop
Air India Logo
14:35 - 19:00
DPS
-
LHR
35h 25m
1 stop
$982Air India
Thu, 30 Apr - Sun, 17 May
Air India Logo
13:15 - 13:35
LHR
-
DPS
41h 20m
1 stop
Air India Logo
14:35 - 20:00
DPS
-
LHR
36h 25m
1 stop
$983Air India
Mon, 13 Apr - Mon, 27 Apr

China Southern flights from London Heathrow Airport to Southeast Asia

Our best China Southern deals on London Heathrow Airport to Southeast Asia flight tickets
China Southern
12 Mar
LHR22:00London Heathrow
33h 05m
1 stop
BKK14:05Bangkok Suvarnabhumi
19 Mar
BKK19:15Bangkok Suvarnabhumi
29h 40m
2 stops
LHR17:55London Heathrow
$921
China Southern
14 Mar
LHR22:00London Heathrow
25h 35m
1 stop
DPS07:35Denpasar Bali Ngurah Rai
29 Mar
DPS00:30Denpasar Bali Ngurah Rai
25h 30m
1 stop
LHR19:00London Heathrow
$1,067

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
11 Mar
LHR21:10London Heathrow
31h 00m
1 stop
BKK11:10Bangkok Suvarnabhumi
7 May
BKK19:30Bangkok Suvarnabhumi
30h 30m
1 stop
LHR20:00London Heathrow
$875
Shenzhen Airlines
18 Feb
LHR21:10London Heathrow
22h 05m
1 stop
BKK02:15Bangkok Suvarnabhumi
3 Mar
BKK19:30Bangkok Suvarnabhumi
30h 40m
1 stop
LHR19:10London Heathrow
$879
Shenzhen Airlines
4 Mar
LHR21:10London Heathrow
22h 05m
1 stop
BKK02:15Bangkok Suvarnabhumi
17 Mar
BKK19:30Bangkok Suvarnabhumi
30h 40m
1 stop
LHR19:10London Heathrow
$887

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 28 January 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

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 18/2

21:00-22:25

1 stop18h 25m

Bangkok Suvarnabhumi

Thu 5/3

05:45-17:30

1 stop18h 45m

$806

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 18/2

21:00-22:25

1 stop18h 25m

Bangkok Suvarnabhumi

Mon 16/3

19:55-17:30

1 stop28h 35m

$810

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Wed 18/2

21:00-22:45

1 stop18h 45m

Phuket City

Mon 9/3

23:05-17:30

1 stop25h 25m

$812

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 12/3

18:40-18:00

1 stop15h 20m

Singapore Changi

Sun 22/3

00:05-08:05

1 stop16h 00m

$941

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Wed 15/4

17:50-16:35

1 stop15h 45m

Singapore Changi

Mon 25/5

23:40-08:40

1 stop16h 00m

$946

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Fri 6/3

21:10-12:10

1 stop31h 00m

Singapore Changi

Tue 10/3

18:30-19:10

1 stop32h 40m

$949

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 5/3

20:05-18:00

1 stop37h 55m

Singapore Changi

Tue 17/3

00:05-13:40

2 stops21h 35m

$959

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Wed 11/3

21:10-12:10

1 stop31h 00m

Singapore Changi

Sun 15/3

18:30-19:10

1 stop32h 40m

$961

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Thu 30/4

09:45-13:35

1 stop20h 50m

Denpasar Bali Ngurah Rai

Sun 17/5

14:35-19:00

1 stop35h 25m

$982

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Mon 13/4

13:15-13:35

1 stop41h 20m

Denpasar Bali Ngurah Rai

Mon 27/4

14:35-20:00

1 stop36h 25m

$983

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 $1,288, 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 $1,341.

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

Fly from London Heathrow to Ho Chi Minh City for the best London Heathrow - 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 Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around $1,540 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 $1,428 on momondo.

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

There are 4 cabin classes available to choose from on London Heathrow 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 40m

Direct flights

Every day

Airports in Southeast Asia

295 airports
The fastest flight from London Heathrow Airport to Southeast Asia takes 11h 40m
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

  • 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?

Best airlines flying from London Heathrow Airport to Southeast Asia

Compare and see reviews for airlines that fly from London Heathrow Airport to Southeast Asia with momondo
Airline
Rating
Free cancellation
Price
Thai AirwaysPriceFrom $1,112Free cancellationRating
7.8
380 reviews
Search Thai Airways flights

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.

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.
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