Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from London to Southeast Asia from £254

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 10/2. 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 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 to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
China Eastern Logo
21:00 - 04:45
LHR
-
BKK
24h 45m
1 stop
China Eastern Logo
05:45 - 17:30
BKK
-
LHR
18h 45m
1 stop
£397China Eastern
Tue, 17 Feb - Tue, 10 Mar
China Eastern Logo
11:35 - 14:55
LGW
-
BKK
21h 20m
2 stops
China Eastern Logo
02:10 - 15:10
BKK
-
LGW
19h 00m
1 stop
£397China Eastern
Sat, 2 May - Sun, 17 May
China Southern Logo
20:20 - 01:50
LGW
-
BKK
22h 30m
1 stop
China Southern Logo
15:45 - 17:20
BKK
-
LGW
32h 35m
2 stops
£399China Southern
Tue, 3 Mar - Fri, 13 Mar
Air India Logo
13:30 - 13:35
LHR
-
BKK
17h 05m
1 stop
Air India Logo
20:50 - 11:05
BKK
-
LHR
21h 15m
1 stop
£399Air India
Thu, 26 Feb - Sun, 22 Mar
Air India Logo
20:30 - 19:35
LHR
-
BKK
16h 05m
1 stop
Air India Logo
20:50 - 11:05
BKK
-
LHR
21h 15m
1 stop
£400Air India
Wed, 4 Mar - Sun, 22 Mar
China Southern Logo
20:20 - 01:50
LGW
-
BKK
22h 30m
1 stop
China Southern Logo
18:05 - 07:05
BKK
-
LGW
19h 00m
1 stop
£402China Southern
Tue, 3 Mar - Thu, 30 Apr
Air China Logo
22:40 - 00:10
LHR
-
BKK
19h 30m
1 stop
Air China Logo
01:30 - 20:25
BKK
-
LHR
24h 55m
1 stop
£402Air China
Wed, 22 Apr - Sat, 9 May
Air China Logo
22:40 - 17:45
LHR
-
HKT
37h 05m
1 stop
Air China Logo
19:25 - 20:25
HKT
-
LHR
31h 00m
1 stop
£404Air China
Tue, 21 Apr - Mon, 11 May
Etihad Airways Logo
08:50 - 19:35
LHR
-
KUL
26h 45m
1 stop
Etihad Airways Logo
09:35 - 18:10
KUL
-
LHR
16h 35m
1 stop
£506Etihad Airways
Tue, 10 Feb - Tue, 10 Mar
Etihad Airways Logo
13:55 - 19:35
LHR
-
KUL
21h 40m
1 stop
Etihad Airways Logo
09:35 - 18:10
KUL
-
LHR
16h 35m
1 stop
£508Etihad Airways
Thu, 26 Feb - Thu, 5 Mar

KLM flights from London to Southeast Asia

Our best KLM deals on London to Southeast Asia flight tickets
KLM
6 May
LCY08:25London City
19h 05m
1 stop
BKK09:30Bangkok Suvarnabhumi
19 May
BKK12:05Bangkok Suvarnabhumi
34h 35m
1 stop
LCY16:40London City
£571
KLM
3 May
LCY13:45London City
13h 45m
1 stop
BKK09:30Bangkok Suvarnabhumi
19 May
BKK12:05Bangkok Suvarnabhumi
25h 50m
1 stop
LCY07:55London City
£573
KLM
2 Feb
LCY08:40London City
15h 30m
1 stop
BKK07:10Bangkok Suvarnabhumi
6 Feb
BKK09:15Bangkok Suvarnabhumi
17h 20m
1 stop
LCY19:35London City
£752

Etihad Airways flights from London to Southeast Asia

Our best Etihad Airways deals on London to Southeast Asia flight tickets
Etihad Airways
8 Feb
LHR13:55London Heathrow
26h 30m
1 stop
BKK23:25Bangkok Suvarnabhumi
11 May
BKK09:45Bangkok Suvarnabhumi
35h 20m
1 stop
LHR15:05London Heathrow
£418
Etihad Airways
2 Feb
LHR08:50London Heathrow
31h 35m
1 stop
BKK23:25Bangkok Suvarnabhumi
9 Feb
BKK14:40Bangkok Suvarnabhumi
23h 00m
1 stop
LHR06:40London Heathrow
£423
Etihad Airways
23 Feb
LHR13:55London Heathrow
14h 50m
1 stop
BKK11:45Bangkok Suvarnabhumi
18 May
BKK03:15Bangkok Suvarnabhumi
17h 50m
1 stop
LHR15:05London Heathrow
£425

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 29 January 2026.
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

Tue 17/2

21:00-04:45

1 stop24h 45m

Bangkok Suvarnabhumi

Tue 10/3

05:45-17:30

1 stop18h 45m

£397

LondonBangkok

LGW - BKK

LGWBKK

London Gatwick

Sat 2/5

11:35-14:55

2 stops21h 20m

Bangkok Suvarnabhumi

Sun 17/5

02:10-15:10

1 stop19h 00m

£397

LondonBangkok

LGW - BKK

LGWBKK

London Gatwick

Tue 3/3

20:20-01:50

1 stop22h 30m

Bangkok Suvarnabhumi

Fri 13/3

15:45-17:20

2 stops32h 35m

£399

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 26/2

13:30-13:35

1 stop17h 05m

Bangkok Suvarnabhumi

Sun 22/3

20:50-11:05

1 stop21h 15m

£399

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 4/3

20:30-19:35

1 stop16h 05m

Bangkok Suvarnabhumi

Sun 22/3

20:50-11:05

1 stop21h 15m

£400

LondonBangkok

LGW - BKK

LGWBKK

London Gatwick

Tue 3/3

20:20-01:50

1 stop22h 30m

Bangkok Suvarnabhumi

Thu 30/4

18:05-07:05

1 stop19h 00m

£402

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 22/4

22:40-00:10

1 stop19h 30m

Bangkok Suvarnabhumi

Sat 9/5

01:30-20:25

1 stop24h 55m

£402

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Tue 21/4

22:40-17:45

1 stop37h 05m

Phuket City

Mon 11/5

19:25-20:25

1 stop31h 00m

£404

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Tue 10/2

08:50-19:35

1 stop26h 45m

Kuala Lumpur Intl

Tue 10/3

09:35-18:10

1 stop16h 35m

£506

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Thu 26/2

13:55-19:35

1 stop21h 40m

Kuala Lumpur Intl

Thu 5/3

09:35-18:10

1 stop16h 35m

£508

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 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 £381. If you are unable to visit Southeast Asia during the month of May, then departing from London during the month September is also very affordable. Most momondo users find prices during this month for around £526.

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 £696. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to Southeast Asia on Saturday is £745.

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 to Southeast Asia when you can find flight prices for as low as £705. Flying to Southeast Asia in the morning 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 £716. 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 £679 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 for as low as £634 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 15m

Direct flights

Mon, Wed, Thu, Sat and Sun

Airports in Southeast Asia

295 airports
The fastest flight from London to Southeast Asia takes 11h 15m
Direct flights go from London to Southeast Asia on Monday, 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 updated daily.

  • 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
Turkmenistan AirlinesPriceFrom £262Free CancellationRating
0.0
0 reviews
Search Turkmenistan Airlines flights
Hahn AirPriceFrom £267Free CancellationRating
0.0
Search Hahn Air flights
Scandinavian AirlinesPriceFrom £276Free CancellationRating
7.3
1,674 reviews
Search Scandinavian Airlines flights
China AirlinesPriceFrom £330Free CancellationRating
8.3
802 reviews
Search China Airlines flights
Air ArabiaPriceFrom £340Free CancellationRating
7.7
55 reviews
Search Air Arabia flights
Hainan AirlinesPriceFrom £343Free CancellationRating
8.2
62 reviews
Search Hainan Airlines flights
ITA AirwaysPriceFrom £356Free CancellationRating
6.7
1,137 reviews
Search ITA Airways flights
KLMPriceFrom £359Free CancellationRating
7.7
1,443 reviews
Search KLM flights
Royal JordanianPriceFrom £404Free CancellationRating
6.8
453 reviews
Search Royal Jordanian flights
Royal Brunei AirlinesPriceFrom £416Free CancellationRating
0.0
0 reviews
Search Royal Brunei Airlines flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Southeast Asia. momondo saves you time and could save you money on your trip.

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

All flight searches from London to Southeast Asia on momondo can be filtered to show those which offer flexible booking policies.

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?

Yes momondo offers price alerts on flights to Southeast Asia from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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
Sat 28/2
Sat 7/3
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 Londonfrom £28
Flights to Bangkokfrom £279
Flights to New Yorkfrom £232
Flights to Dubaifrom £194
Flights to Manchesterfrom £32
Flights to Islamabadfrom £325
Flights to Istanbulfrom £51
Flights to Manilafrom £388
Flights to Jeddahfrom £139
Flights to New Delhifrom £335
Flights to Copenhagenfrom £32
Flights to Mumbaifrom £221