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Cheap flights from London to Southeast Asia from $339

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 to Southeast Asia departing on 1/12. 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 to Southeast Asia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Hainan Airlines Logo
7:45 pm - 10:05 am
LHR
-
BKK
31h 20m1 stop
Hainan Airlines Logo
7:20 pm - 7:30 pm
BKK
-
LHR
30h 10m2 stops
$595Hainan Airlines
Wed, Mar 11 - Thu, May 7
Air China Logo
10:40 pm - 12:10 am
LHR
-
BKK
19h 30m1 stop
Air China Logo
1:30 am - 5:40 pm
BKK
-
LHR
22h 10m1 stop
$596Air China
Tue, Jun 2 - Mon, Jun 8
China Southern Logo
10:00 pm - 1:05 am
LHR
-
BKK
20h 05m1 stop
China Southern Logo
2:40 am - 6:35 pm
BKK
-
LHR
22h 55m2 stops
$598China Southern
Tue, Jan 27 - Mon, Feb 2
China Eastern Logo
10:30 am - 12:20 pm
LGW
-
BKK
18h 50m1 stop
China Eastern Logo
3:10 am - 6:30 am
BKK
-
LGW
34h 20m2 stops
$599China Eastern
Wed, Jan 21 - Mon, Feb 2
China Southern Logo
10:00 pm - 1:05 am
LHR
-
BKK
20h 05m1 stop
China Southern Logo
2:50 am - 6:35 pm
BKK
-
LHR
46h 45m2 stops
$606China Southern
Mon, Jan 26 - Thu, Feb 5
China Eastern Logo
5:00 pm - 5:50 pm
LGW
-
BKK
17h 50m1 stop
China Eastern Logo
1:55 am - 2:00 pm
BKK
-
LGW
19h 05m1 stop
$607China Eastern
Mon, Mar 2 - Sun, Mar 15
Etihad Airways Logo
8:50 am - 7:35 pm
LHR
-
KUL
26h 45m1 stop
Etihad Airways Logo
9:35 am - 2:30 pm
KUL
-
LHR
36h 55m1 stop
$691Etihad Airways
Sun, Jan 25 - Sat, Jan 31
Etihad Airways Logo
1:55 pm - 2:00 pm
LHR
-
LGK
40h 05m2 stops
Etihad Airways Logo
12:05 pm - 12:05 pm
LGK
-
LHR
56h 00m2 stops
$803Etihad Airways
Thu, Feb 5 - Tue, Feb 24
British Airways Logo
9:30 pm - 10:35 am
LHR
-
LGK
30h 05m1 stop
British Airways Logo
5:35 pm - 5:25 am
LGK
-
LHR
18h 50m1 stop
$1,013British Airways
Sat, Apr 11 - Thu, Apr 23
British Airways Logo
9:30 pm - 10:35 am
LHR
-
LGK
30h 05m1 stop
British Airways Logo
5:35 pm - 5:25 am
LGK
-
LHR
18h 50m1 stop
$1,038British Airways
Mon, Apr 13 - Wed, Apr 22

China Southern flights from London to Southeast Asia

Our best China Southern deals on London to Southeast Asia flight tickets
China Southern
Jan 27
LHR10:00 pmLondon Heathrow
20h 05m
1 stop
BKK1:05 amBangkok Suvarnabhumi
Feb 2
BKK2:40 amBangkok Suvarnabhumi
22h 55m
2 stops
LHR6:35 pmLondon Heathrow
$598
Find similar
China Southern
Jan 26
LHR10:00 pmLondon Heathrow
20h 05m
1 stop
BKK1:05 amBangkok Suvarnabhumi
Feb 5
BKK2:50 amBangkok Suvarnabhumi
46h 45m
2 stops
LHR6:35 pmLondon Heathrow
$606
Find similar
China Southern
Feb 26
LHR10:00 pmLondon Heathrow
29h 10m
1 stop
BKK10:10 amBangkok Suvarnabhumi
Mar 22
BKK2:10 amBangkok Suvarnabhumi
21h 50m
1 stop
LHR5:00 pmLondon Heathrow
$611
Find similar

Air China flights from London to Southeast Asia

Our best Air China deals on London to Southeast Asia flight tickets
Air China
Jun 2
LHR8:25 pmLondon Heathrow
21h 45m
1 stop
BKK12:10 amBangkok Suvarnabhumi
Jun 8
BKK1:30 amBangkok Suvarnabhumi
22h 10m
1 stop
LHR5:40 pmLondon Heathrow
$596
Find similar
Air China
Jan 13
LHR8:25 pmLondon Heathrow
21h 45m
1 stop
SGN1:10 amHo Chi Minh City
Jan 20
SGN5:00 amHo Chi Minh City
19h 50m
1 stop
LHR5:50 pmLondon Heathrow
$601
Find similar
Air China
Jan 15
LHR5:40 pmLondon Heathrow
17h 25m
1 stop
BKK6:05 pmBangkok Suvarnabhumi
Feb 11
BKK1:30 amBangkok Suvarnabhumi
23h 20m
1 stop
LHR5:50 pmLondon Heathrow
$605
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from London 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 832,500 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from London to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 3/11

7:45 pm-10:05 am

1 stop31h 20m

Bangkok Suvarnabhumi

Thu 5/7

7:20 pm-7:30 pm

2 stops30h 10m

$595

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 6/2

10:40 pm-12:10 am

1 stop19h 30m

Bangkok Suvarnabhumi

Mon 6/8

1:30 am-5:40 pm

1 stop22h 10m

$596

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 1/27

10:00 pm-1:05 am

1 stop20h 05m

Bangkok Suvarnabhumi

Mon 2/2

2:40 am-6:35 pm

2 stops22h 55m

$598

LondonBangkok

LGW - BKK

LGWBKK

London Gatwick

Wed 1/21

10:30 am-12:20 pm

1 stop18h 50m

Bangkok Suvarnabhumi

Mon 2/2

3:10 am-6:30 am

2 stops34h 20m

$599

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 1/26

10:00 pm-1:05 am

1 stop20h 05m

Bangkok Suvarnabhumi

Thu 2/5

2:50 am-6:35 pm

2 stops46h 45m

$606

LondonBangkok

LGW - BKK

LGWBKK

London Gatwick

Mon 3/2

5:00 pm-5:50 pm

1 stop17h 50m

Bangkok Suvarnabhumi

Sun 3/15

1:55 am-2:00 pm

1 stop19h 05m

$607

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Sun 1/25

8:50 am-7:35 pm

1 stop26h 45m

Kuala Lumpur Intl

Sat 1/31

9:35 am-2:30 pm

1 stop36h 55m

$691

LondonLangkawi

LHR - LGK

LHRLGK

London Heathrow

Thu 2/5

1:55 pm-2:00 pm

2 stops40h 05m

Langkawi

Tue 2/24

12:05 pm-12:05 pm

2 stops56h 00m

$803

LondonLangkawi

LHR - LGK

LHRLGK

London Heathrow

Sat 4/11

9:30 pm-10:35 am

1 stop30h 05m

Langkawi

Thu 4/23

5:35 pm-5:25 am

1 stop18h 50m

$1,013

LondonLangkawi

LHR - LGK

LHRLGK

London Heathrow

Mon 4/13

9:30 pm-10:35 am

1 stop30h 05m

Langkawi

Wed 4/22

5:35 pm-5:25 am

1 stop18h 50m

$1,038

Flights are sorted by cheapest round-trip 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 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 month of May is, on average, the cheapest month to fly to Southeast Asia from London, with most prices found around $530. If you don’t want to visit Southeast Asia in May, then you should wait until September to fly from London, when ticket prices are also cheap, with an average price of $726.

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

The cheapest day to depart from London to Southeast Asia is on a Monday when prices can be found for as low as $973. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,054. 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?

In the afternoon is the cheapest time of day to fly from London to Southeast Asia when you can find flight prices for as low as $798. Flying to Southeast Asia in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the evening because they tend to be around $1,046. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest London to Southeast Asia flight route?

Fly from London Gatwick to Bangkok Suvarnabhumi for the best London - 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 when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around $940 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Southeast Asia from London for as low as $876 on momondo.

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

There are 4 cabin classes available to choose from on London 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 to Southeast Asia flights?

No. A direct flight is the cheapest option for a flight between London to Southeast Asia.

Cheap London to Southeast Asia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Southeast Asia

Fastest flight time

11h 25m

Direct flights

Mon, Tue, Wed, Thu, Sat and Sun

Airports in Southeast Asia

295 airports
The fastest flight from London to Southeast Asia takes 11h 25m
Direct flights go from London to Southeast Asia on Monday, Tuesday, Wednesday, Thursday, Saturday and Sunday. There are no airlines offering direct flights.
There are 295 airports in Southeast Asia. From London there are direct flights to Bangkok Suvarnabhumi (BKK).
Search flight deals

  • When did momondo last update prices for flights from London to Southeast Asia?

    Prices for flights from London to Southeast Asia are refreshed on a daily basis.

  • How many operators does momondo search for flights from London to Southeast Asia?

  • How old do you have to be to fly from London to Southeast Asia?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London 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 license 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 to Southeast Asia?

Best airlines flying from London to Southeast Asia

Compare and see reviews for airlines that fly from London to Southeast Asia with momondo
Airline
Rating
Free Cancellation
Price
SAUDIAPriceFrom $407Free CancellationRating
7.4
647 reviews
Search SAUDIA flights
Shenzhen AirlinesPriceFrom $457Free CancellationRating
7.6
22 reviews
Search Shenzhen Airlines flights
Gulf AirPriceFrom $462Free CancellationRating
7.2
226 reviews
Search Gulf Air flights
Air IndiaPriceFrom $472Free CancellationRating
5.5
2,951 reviews
Search Air India flights
China EasternPriceFrom $490Free CancellationRating
7.2
178 reviews
Search China Eastern flights
Norse Atlantic UKPriceFrom $496Free CancellationRating
7.2
51 reviews
Search Norse Atlantic UK flights
China SouthernPriceFrom $559Free CancellationRating
7.5
122 reviews
Search China Southern flights
Hainan AirlinesPriceFrom $560Free CancellationRating
8.3
58 reviews
Search Hainan Airlines flights
British AirwaysPriceFrom $620Free CancellationRating
6.7
7,580 reviews
Search British Airways flights
Austrian AirlinesPriceFrom $641Free CancellationRating
7.6
879 reviews
Search Austrian Airlines 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. 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?

Once all potential London to Southeast Asia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
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