Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from London Heathrow Airport to Southeast Asia from €340

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

Discover deals from 900+ travel sites with momondo.

Voted the Winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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 - 01:50LHR-SGN
21h 40m1 stop
Shenzhen Airlines Logo
02:50 - 19:10SGN-LHR
23h 20m1 stop
€524Shenzhen Airlines
Find Deal
Fri, 20 Feb - Sun, 1 Mar
Air China Logo
17:40 - 00:10LHR-BKK
23h 30m1 stop
Air China Logo
01:30 - 15:55BKK-LHR
21h 25m1 stop
€525Air China
Find Deal
Wed, 3 Dec - Mon, 2 Mar
Shenzhen Airlines Logo
21:10 - 01:50LHR-SGN
21h 40m1 stop
Shenzhen Airlines Logo
02:50 - 19:10SGN-LHR
23h 20m1 stop
€526Shenzhen Airlines
Find Deal
Wed, 4 Feb - Sun, 15 Feb
Austrian Airlines Logo
09:05 - 12:20LHR-BKK
20h 15m1 stop
Austrian Airlines Logo
14:00 - 21:40BKK-LHR
14h 40m1 stop
€526Austrian Airlines
Find Deal
Sun, 11 Jan - Mon, 19 Jan
Austrian Airlines Logo
19:25 - 15:30LHR-BKK
13h 05m1 stop
Austrian Airlines Logo
14:00 - 21:40BKK-LHR
14h 40m1 stop
€528Austrian Airlines
Find Deal
Tue, 13 Jan - Thu, 29 Jan
Multiple Airlines Logo
13:45 - 10:45LHR-BKK
14h 00m1 stop
Multiple Airlines Logo
23:50 - 08:20BKK-LHR
15h 30m1 stop
€530Multiple Airlines
Find Deal
Thu, 4 Dec - Wed, 31 Dec
Hainan Airlines Logo
21:00 - 10:05LHR-BKK
30h 05m2 stops
Hainan Airlines Logo
11:10 - 16:20BKK-LHR
36h 10m1 stop
€532Hainan Airlines
Find Deal
Mon, 29 Dec - Tue, 13 Jan
Multiple Airlines Logo
13:45 - 10:45LHR-BKK
14h 00m1 stop
Multiple Airlines Logo
23:50 - 08:20BKK-LHR
15h 30m1 stop
€547Multiple Airlines
Find Deal
Wed, 3 Dec - Wed, 24 Dec
SWISS Logo
18:40 - 09:45LHR-BKK
33h 05m1 stop
SWISS Logo
12:50 - 07:55BKK-LHR
25h 05m1 stop
€551SWISS
Find Deal
Fri, 8 May - Fri, 29 May
SWISS Logo
07:00 - 10:45LHR-BKK
20h 45m2 stops
SWISS Logo
13:15 - 08:05BKK-LHR
25h 50m1 stop
€555SWISS
Find Deal
Tue, 2 Dec - Wed, 3 Dec

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
3 Dec
LHR17:40London Heathrow
23h 30m
1 stop
BKK00:10Bangkok Suvarnabhumi
2 Mar
BKK01:30Bangkok Suvarnabhumi
21h 25m
1 stop
LHR15:55London Heathrow
€525
Find similar
Air China
3 Dec
LHR17:40London Heathrow
17h 25m
1 stop
BKK18:05Bangkok Suvarnabhumi
2 Mar
BKK01:30Bangkok Suvarnabhumi
23h 20m
1 stop
LHR17:50London Heathrow
€526
Find similar
Air China
1 Mar
LHR17:40London Heathrow
17h 25m
1 stop
BKK18:05Bangkok Suvarnabhumi
18 Mar
BKK19:30Bangkok Suvarnabhumi
29h 20m
1 stop
LHR17:50London Heathrow
€533
Find similar

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
11 Jan
LHR09:05London Heathrow
20h 15m
1 stop
BKK12:20Bangkok Suvarnabhumi
19 Jan
BKK14:00Bangkok Suvarnabhumi
14h 40m
1 stop
LHR21:40London Heathrow
€526
Find similar
Austrian Airlines
13 Jan
LHR19:25London Heathrow
13h 05m
1 stop
BKK15:30Bangkok Suvarnabhumi
29 Jan
BKK14:00Bangkok Suvarnabhumi
14h 40m
1 stop
LHR21:40London Heathrow
€528
Find similar
Austrian Airlines
1 Jan
LHR19:25London Heathrow
13h 05m
1 stop
BKK15:30Bangkok Suvarnabhumi
14 Jan
BKK14:00Bangkok Suvarnabhumi
14h 40m
1 stop
LHR21:40London Heathrow
€545
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 9 November 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

LondonHo Chi Minh City

LHR - SGN

LHRSGN

London Heathrow

Fri 20/2

21:10-01:50

1 stop21h 40m

Ho Chi Minh City

Sun 1/3

02:50-19:10

1 stop23h 20m

€524

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 3/12

17:40-00:10

1 stop23h 30m

Bangkok Suvarnabhumi

Mon 2/3

01:30-15:55

1 stop21h 25m

€525

LondonHo Chi Minh City

LHR - SGN

LHRSGN

London Heathrow

Wed 4/2

21:10-01:50

1 stop21h 40m

Ho Chi Minh City

Sun 15/2

02:50-19:10

1 stop23h 20m

€526

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 11/1

09:05-12:20

1 stop20h 15m

Bangkok Suvarnabhumi

Mon 19/1

14:00-21:40

1 stop14h 40m

€526

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 13/1

19:25-15:30

1 stop13h 05m

Bangkok Suvarnabhumi

Thu 29/1

14:00-21:40

1 stop14h 40m

€528

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 4/12

13:45-10:45

1 stop14h 00m

Bangkok Suvarnabhumi

Wed 31/12

23:50-08:20

1 stop15h 30m

€530

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 29/12

21:00-10:05

2 stops30h 05m

Bangkok Suvarnabhumi

Tue 13/1

11:10-16:20

1 stop36h 10m

€532

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 3/12

13:45-10:45

1 stop14h 00m

Bangkok Suvarnabhumi

Wed 24/12

23:50-08:20

1 stop15h 30m

€547

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 8/5

18:40-09:45

1 stop33h 05m

Bangkok Suvarnabhumi

Fri 29/5

12:50-07:55

1 stop25h 05m

€551

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 2/12

07:00-10:45

2 stops20h 45m

Bangkok Suvarnabhumi

Wed 3/12

13:15-08:05

1 stop25h 50m

€555

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 €708, 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 €712.

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 €797. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €1,117. 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 €688. Flights to Southeast Asia are more costly in the evening, with an average ticket price of €861. 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 €816 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 €753 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

2 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 2 airports near Southeast Asia: Bangkok Suvarnabhumi (BKK), Ho Chi Minh City (SGN)
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 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 €448Free CancellationRating
7.1
122 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

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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 9/12
Tue 16/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Southeast Asia

Popular Cities in Southeast Asia

Popular flights according to clicks in the last 7 days on momondo
Flights to Dublinfrom €39
Flights to Bangkokfrom €445
Flights to Londonfrom €32
Flights to New Yorkfrom €256
Flights to Sao Paulofrom €608
Flights to Istanbulfrom €113
Flights to Parisfrom €30
Flights to Manilafrom €558
Flights to New Delhifrom €408
Flights to Dubaifrom €306
Flights to Copenhagenfrom €60
Flights to Lagosfrom €507