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Cheap flights from London Heathrow Airport to Southeast Asia from €333

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 12/3. 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 Heathrow Airport to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
Shenzhen Airlines Logo
21:10 - 11:10LHR-BKK
31h 00m1 stop
Shenzhen Airlines Logo
19:30 - 19:10BKK-LHR
30h 40m1 stop
€515Shenzhen Airlines
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Sun, 8 Mar - Sun, 22 Mar
China Southern Logo
22:00 - 11:25LHR-BKK
30h 25m1 stop
China Southern Logo
15:45 - 14:00BKK-LHR
29h 15m2 stops
€517China Southern
Find Deal
Sat, 7 Mar - Sat, 14 Mar
Shenzhen Airlines Logo
21:10 - 01:50LHR-SGN
21h 40m1 stop
Shenzhen Airlines Logo
02:50 - 19:10SGN-LHR
23h 20m1 stop
€528Shenzhen Airlines
Find Deal
Fri, 14 Nov - Thu, 27 Nov
Multiple Airlines Logo
16:40 - 14:50LHR-BKK
15h 10m1 stop
Multiple Airlines Logo
12:50 - 21:45BKK-LHR
14h 55m1 stop
€535Multiple Airlines
Find Deal
Sun, 15 Mar - Tue, 2 Jun
Multiple Airlines Logo
13:55 - 12:20LHR-BKK
15h 25m1 stop
Multiple Airlines Logo
12:50 - 21:45BKK-LHR
14h 55m1 stop
€538Multiple Airlines
Find Deal
Sun, 22 Mar - Tue, 2 Jun
Air China Logo
17:40 - 18:05LHR-BKK
17h 25m1 stop
Air China Logo
01:30 - 15:55BKK-LHR
21h 25m1 stop
€540Air China
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Sun, 16 Nov - Sun, 30 Nov
KLM Logo
17:05 - 18:45LHR-KUL
17h 40m2 stops
KLM Logo
23:50 - 09:00KUL-LHR
17h 10m1 stop
€543KLM
Find Deal
Tue, 25 Nov - Tue, 2 Dec
Austrian Airlines Logo
09:05 - 12:20LHR-BKK
20h 15m1 stop
Austrian Airlines Logo
23:40 - 08:20BKK-LHR
14h 40m1 stop
€546Austrian Airlines
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Sun, 22 Mar - Tue, 26 May
KLM Logo
15:45 - 18:45LHR-KUL
19h 00m2 stops
KLM Logo
23:50 - 07:40KUL-LHR
15h 50m1 stop
€549KLM
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Mon, 1 Dec - Thu, 4 Dec
Air China Logo
17:40 - 18:05LHR-BKK
17h 25m1 stop
Air China Logo
01:30 - 15:55BKK-LHR
21h 25m1 stop
€559Air China
Find Deal
Mon, 17 Nov - Wed, 3 Dec

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
8 Mar
LHR21:10London Heathrow
31h 00m
1 stop
BKK11:10Bangkok Suvarnabhumi
22 Mar
BKK19:30Bangkok Suvarnabhumi
30h 40m
1 stop
LHR19:10London Heathrow
€515
Find similar
Shenzhen Airlines
14 Nov
LHR21:10London Heathrow
21h 40m
1 stop
SGN01:50Ho Chi Minh City
27 Nov
SGN02:50Ho Chi Minh City
23h 20m
1 stop
LHR19:10London Heathrow
€528
Find similar
Shenzhen Airlines
16 Nov
LHR21:10London Heathrow
21h 40m
1 stop
SGN01:50Ho Chi Minh City
27 Nov
SGN02:50Ho Chi Minh City
23h 20m
1 stop
LHR19:10London Heathrow
€531
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
16 Nov
LHR17:40London Heathrow
17h 25m
1 stop
BKK18:05Bangkok Suvarnabhumi
30 Nov
BKK01:30Bangkok Suvarnabhumi
21h 25m
1 stop
LHR15:55London Heathrow
€540
Find similar
Air China
17 Nov
LHR17:40London Heathrow
17h 25m
1 stop
BKK18:05Bangkok Suvarnabhumi
3 Dec
BKK01:30Bangkok Suvarnabhumi
21h 25m
1 stop
LHR15:55London Heathrow
€559
Find similar
Air China
14 Mar
LHR21:35London Heathrow
31h 55m
1 stop
BKK12:30Bangkok Suvarnabhumi
18 Mar
BKK01:30Bangkok Suvarnabhumi
21h 25m
1 stop
LHR15:55London Heathrow
€567
Find similar

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 13,528 searches. Data last updated 28 October 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

Sun 8/3

21:10-11:10

1 stop31h 00m

Bangkok Suvarnabhumi

Sun 22/3

19:30-19:10

1 stop30h 40m

€515

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 7/3

22:00-11:25

1 stop30h 25m

Bangkok Suvarnabhumi

Sat 14/3

15:45-14:00

2 stops29h 15m

€517

LondonHo Chi Minh City

LHR - SGN

LHRSGN

London Heathrow

Fri 14/11

21:10-01:50

1 stop21h 40m

Ho Chi Minh City

Thu 27/11

02:50-19:10

1 stop23h 20m

€528

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 15/3

16:40-14:50

1 stop15h 10m

Bangkok Suvarnabhumi

Tue 2/6

12:50-21:45

1 stop14h 55m

€535

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 22/3

13:55-12:20

1 stop15h 25m

Bangkok Suvarnabhumi

Tue 2/6

12:50-21:45

1 stop14h 55m

€538

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 16/11

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Sun 30/11

01:30-15:55

1 stop21h 25m

€540

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Tue 25/11

17:05-18:45

2 stops17h 40m

Kuala Lumpur Intl

Tue 2/12

23:50-09:00

1 stop17h 10m

€543

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 22/3

09:05-12:20

1 stop20h 15m

Bangkok Suvarnabhumi

Tue 26/5

23:40-08:20

1 stop14h 40m

€546

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 1/12

15:45-18:45

2 stops19h 00m

Kuala Lumpur Intl

Thu 4/12

23:50-07:40

1 stop15h 50m

€549

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 17/11

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Wed 3/12

01:30-15:55

1 stop21h 25m

€559

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 September. Flight prices, which tend to average around €704, are often lower during this time because this is during the off-season. If you’re not able to fly to Southeast Asia in September, then May is your next best option. Flight prices from London Heathrow Airport to Southeast Asia during May average around €709.

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

The cheapest day to depart from London Heathrow Airport 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 €792. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €1,162. 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 Heathrow Airport to Southeast Asia during this time can be as low as €683. Flights to Southeast Asia are more costly in the evening, with an average ticket price of €922. 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 Heathrow to Southeast Asia flight route?

Fly from London Heathrow to Bangkok Suvarnabhumi 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 €811 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 €748 on momondo.

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

There are 2 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 refreshed on a daily basis.

  • 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?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Southeast Asia.

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

    The necessary travel and health documents for your Southeast Asia trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • 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
Air ChinaPriceFrom €445Free CancellationRating
7.2
117 reviews
Search Air China flights

Why use momondo?

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

Finding the right flight to Southeast Asia from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Southeast Asia quick and easy, saving you time and money.

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

Yes. All flights to Southeast Asia from London on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from London to Southeast Asia?

momondo helps you find the best flight between London and Southeast Asia by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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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