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Cheap flights from London Heathrow Airport to Southeast Asia from $535

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 22/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London Heathrow Airport to Southeast Asia

Cheap return flights

Logo
19:25 - 15:30LHR-BKK
13h 05m1 stop
Logo
23:30 - 10:25BKK-LHR
17h 55m1 stop
$896
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Wed, 4 Feb - Thu, 12 Feb
Logo
16:40 - 14:50LHR-BKK
15h 10m1 stop
Logo
23:40 - 08:20BKK-LHR
14h 40m1 stop
$900
Find Deal
Wed, 25 Feb - Wed, 13 May
Austrian Airlines Logo
14:50 - 15:30LHR-BKK
17h 40m1 stop
Austrian Airlines Logo
23:40 - 08:20BKK-LHR
14h 40m1 stop
$902Austrian Airlines
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Tue, 24 Feb - Wed, 13 May
Shenzhen Airlines Logo
21:10 - 11:10LHR-BKK
31h 00m1 stop
Shenzhen Airlines Logo
12:10 - 19:10BKK-LHR
38h 00m1 stop
$908Shenzhen Airlines
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Fri, 7 Nov - Thu, 4 Dec
Shenzhen Airlines Logo
21:10 - 02:15LHR-BKK
22h 05m1 stop
Shenzhen Airlines Logo
19:30 - 19:10BKK-LHR
30h 40m1 stop
$909Shenzhen Airlines
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Mon, 3 Nov - Tue, 11 Nov
Austrian Airlines Logo
14:50 - 15:30LHR-BKK
17h 40m1 stop
Austrian Airlines Logo
23:50 - 14:05BKK-LHR
21h 15m1 stop
$914Austrian Airlines
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Thu, 5 Mar - Fri, 20 Mar
Air India Logo
13:30 - 18:30LHR-SIN
21h 00m1 stop
Air India Logo
23:00 - 11:30SIN-LHR
20h 30m1 stop
$917Air India
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Thu, 5 Feb - Sun, 15 Feb
Air India Logo
20:30 - 13:35LHR-BKK
34h 05m1 stop
Air India Logo
20:50 - 11:05BKK-LHR
21h 15m1 stop
$921Air India
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Mon, 24 Nov - Sat, 29 Nov
Etihad Airways Logo
09:30 - 09:40LHR-SIN
17h 10m1 stop
Etihad Airways Logo
21:10 - 07:00SIN-LHR
16h 50m1 stop
$998Etihad Airways
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Wed, 24 Sep - Tue, 30 Sep
Etihad Airways Logo
21:45 - 09:40LHR-SIN
28h 55m1 stop
Etihad Airways Logo
21:10 - 18:45SIN-LHR
28h 35m1 stop
$1,000Etihad Airways
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Thu, 2 Oct - Mon, 13 Oct

Austrian Airlines flights from London Heathrow Airport to Southeast Asia

Our best Austrian Airlines deals on London Heathrow Airport to Southeast Asia flight tickets
Austrian Airlines
24 Feb
LHR14:50London Heathrow
17h 40m
1 stop
BKK15:30Bangkok Suvarnabhumi
13 May
BKK23:40Bangkok Suvarnabhumi
14h 40m
1 stop
LHR08:20London Heathrow
$902
Find similar
Austrian Airlines
5 Mar
LHR14:50London Heathrow
17h 40m
1 stop
BKK15:30Bangkok Suvarnabhumi
20 Mar
BKK23:50Bangkok Suvarnabhumi
21h 15m
1 stop
LHR14:05London Heathrow
$914
Find similar
Austrian Airlines
29 Jan
LHR14:50London Heathrow
17h 40m
1 stop
BKK15:30Bangkok Suvarnabhumi
14 May
BKK23:40Bangkok Suvarnabhumi
20h 40m
1 stop
LHR14:20London Heathrow
$917
Find similar

Air China flights from London Heathrow Airport to Southeast Asia

Our best Air China deals on London Heathrow Airport to Southeast Asia flight tickets
Air China
27 Oct
LHR17:40London Heathrow
17h 25m
1 stop
BKK18:05Bangkok Suvarnabhumi
3 Nov
BKK13:50Bangkok Suvarnabhumi
37h 25m
1 stop
LHR20:15London Heathrow
$947
Find similar
Air China
27 Oct
LHR20:25London Heathrow
37h 05m
1 stop
HKT16:30Phuket City
3 Nov
HKT14:00Phuket City
37h 15m
1 stop
LHR20:15London Heathrow
$998
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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 14 September 2025.
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 4/2

19:25-15:30

1 stop13h 05m

Bangkok Suvarnabhumi

Thu 12/2

23:30-10:25

1 stop17h 55m

$896

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 25/2

16:40-14:50

1 stop15h 10m

Bangkok Suvarnabhumi

Wed 13/5

23:40-08:20

1 stop14h 40m

$900

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 24/2

14:50-15:30

1 stop17h 40m

Bangkok Suvarnabhumi

Wed 13/5

23:40-08:20

1 stop14h 40m

$902

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 7/11

21:10-11:10

1 stop31h 00m

Bangkok Suvarnabhumi

Thu 4/12

12:10-19:10

1 stop38h 00m

$908

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 3/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Tue 11/11

19:30-19:10

1 stop30h 40m

$909

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 5/3

14:50-15:30

1 stop17h 40m

Bangkok Suvarnabhumi

Fri 20/3

23:50-14:05

1 stop21h 15m

$914

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 5/2

13:30-18:30

1 stop21h 00m

Singapore Changi

Sun 15/2

23:00-11:30

1 stop20h 30m

$917

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 24/11

20:30-13:35

1 stop34h 05m

Bangkok Suvarnabhumi

Sat 29/11

20:50-11:05

1 stop21h 15m

$921

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Wed 24/9

09:30-09:40

1 stop17h 10m

Singapore Changi

Tue 30/9

21:10-07:00

1 stop16h 50m

$998

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 2/10

21:45-09:40

1 stop28h 55m

Singapore Changi

Mon 13/10

21:10-18:45

1 stop28h 35m

$1,000

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 $1,425, are often lower during this time because this is during the off-season. The month of March is another great option to travel to Southeast Asia, with average flight prices from London Heathrow Airport averaging around $1,428.

What is the cheapest day to depart on your flight to Southeast Asia?

Our data shows that Tuesday is the least expensive day to fly to Southeast Asia. Tickets to fly out on this day can be as low as $1,405. On the other hand, Thursday is the most expensive day to depart from London Heathrow Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around $2,106.

What is the cheapest time of day to depart on your flight to Southeast Asia?

In the morning is the cheapest time of day to fly from London Heathrow Airport to Southeast Asia when you can find flight prices for as low as $1,462. Flying to Southeast Asia in the morning is an ideal time because this is during off-peak travel hours. Flights in the evening are often more expensive, with an average ticket price of $1,656.

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 $1,649 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 $1,512 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 25m

Direct flights

Every day

Airports in Southeast Asia

1 airport
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 is 1 airport near Southeast Asia: Bangkok Suvarnabhumi (BKK)
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  • 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
Etihad AirwaysPriceFrom $1,058Free cancellationRating
7.4
1,250 reviews
Search Etihad Airways flights
Thai AirwaysPriceFrom $1,161Free cancellationRating
7.8
350 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.

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