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Cheap flights from London to Southeast Asia from $532

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 28/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BKK
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheap flight deals from London to Southeast Asia

Keep the following information in mind while searching for London to Southeast Asia flight deals. Data was last updated 18 September 2025.

Round-trip from

$893

One-way from

$532

Popular in

December

Cheapest in

May

Average price

$1,100
Shenzhen Airlines
  • Shenzhen Airlines
  • 1/11-8/11
  • 2 total stops
  • 69h 00m total
  • London to Southeast Asia
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28/9
  • 28/9
  • 3 total stops
  • 59h 00m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($187 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($68 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
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Find flight deals from London to Southeast Asia

Cheapest flights from London to Southeast Asia
Explore the most affordable flight options available from London to Southeast Asia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Sat 1/1121:10LHR - BKK
1 stop38h 20mShenzhen Airlines
Sat 8/1119:30BKK - LHR
1 stop30h 40mShenzhen Airlines
Deal found 17/9$893
Sun 2/1121:10LHR - BKK
1 stop31h 00mShenzhen Airlines
Sat 29/1103:15BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 16/9$907
Fri 7/1121:10LHR - BKK
1 stop31h 00mShenzhen Airlines
Tue 25/1119:30BKK - LHR
1 stop30h 40mShenzhen Airlines
Deal found 16/9$908
Sat 29/1121:10LHR - BKK
1 stop31h 00mShenzhen Airlines
Sat 20/1219:30BKK - LHR
1 stop30h 40mShenzhen Airlines
Deal found 16/9$910
Mon 3/1121:10LHR - BKK
1 stop31h 00mShenzhen Airlines
Sat 22/1112:10BKK - LHR
1 stop38h 00mShenzhen Airlines
Deal found 18/9$911
Tue 25/1121:00LHR - BKK
1 stop20h 55mChina Eastern
Fri 30/105:05BKK - LHR
1 stop19h 25mChina Eastern
Deal found 16/9$916
Mon 24/1113:30LHR - BKK
1 stop17h 05mAir India
Sat 29/1114:45BKK - LHR
1 stop27h 20mAir India
Deal found 16/9$920
Sat 1/1120:25LHR - BKK
1 stop20h 45mAir China
Fri 7/1101:30BKK - LHR
1 stop23h 20mAir China
Deal found 17/9$928
Fri 26/922:05LHR - BKK
1 stop22h 10mShenzhen Airlines
Sat 18/1003:15BKK - LHR
1 stop22h 45mShenzhen Airlines
Deal found 16/9$953
Fri 26/922:05LHR - BKK
1 stop22h 10mShenzhen Airlines
Tue 11/1103:15BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 18/9$956
Tue 25/1120:25LHR - BKK
1 stop20h 45mAir China
Thu 29/101:30BKK - LHR
1 stop23h 20mAir China
Deal found 17/9$962
Sat 4/1022:05LHR - BKK
1 stop22h 10mShenzhen Airlines
Tue 4/1112:10BKK - LHR
1 stop38h 00mShenzhen Airlines
Deal found 18/9$967

Cheapflights 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, Cheapflights users made 647,157 searches. Data last updated 18 September 2025.
Use the filters below to find and compare flights from London to Southeast Asia that are best for you.

Fly from

London

Fly to

Southeast Asia

Route

Depart

Return

Price

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 30/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Sun 14/12

03:15-19:10

1 stop22h 55m

$911

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 29/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Tue 16/12

03:15-19:10

1 stop22h 55m

$911

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 19/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Tue 16/12

03:15-19:10

1 stop22h 55m

$911

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 28/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Tue 16/12

03:15-19:10

1 stop22h 55m

$911

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 26/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Thu 11/12

03:15-19:10

1 stop22h 55m

$911

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 29/11

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Sun 14/12

03:15-19:10

1 stop22h 55m

$911

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 1/10

20:55-18:50

1 stop15h 55m

Bangkok Suvarnabhumi

Wed 29/10

08:55-18:10

1 stop16h 15m

$1,058

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 30/10

13:55-23:30

2 stops26h 35m

Bangkok Suvarnabhumi

Wed 3/12

02:55-14:30

1 stop18h 35m

$1,084

LondonKuala Lumpur

LCY - KUL

LCYKUL

London City

Fri 28/11

17:05-15:40

1 stop14h 35m

Kuala Lumpur Intl

Mon 8/12

23:50-07:15

1 stop15h 25m

$1,108

LondonKuala Lumpur

LTN - KUL

LTNKUL

London Luton

Fri 31/10

10:25-20:05

3 stops25h 40m

Kuala Lumpur Intl

Fri 7/11

10:05-23:10

1 stop21h 05m

$1,166

Flights are sorted by cheapest return flights first.

Deals found on 16/9

Showing 1-10 of 60 results
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Best time to book a flight from London to Southeast Asia

Have a flexible travel schedule? Discover the best time to fly to Southeast Asia from London with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Southeast Asia

What is the cheapest month to book a flight from London to Southeast Asia?

Currently, February is the cheapest month in which you can book a flight from London to Southeast Asia (average of $489). Flying from London to Southeast Asia in December is currently the most expensive (average of $911). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LON to YJX?

Find hourly flight availability from London to Southeast Asia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 September 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Southeast Asia as you normally would.

Weekly flight availability from London to Southeast Asia

Explore weekly flight availability from London to Southeast Asia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 18 September 2025.

The most flights from LON to zzYJX are scheduled on a Monday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (7 on average).

Reviews of airlines servicing Southeast Asia

Get insights into the airlines that provide service to Southeast Asia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Southeast Asia. Reviews last updated 18 September 2025.
See what other customers who have flown with Singapore Airlines and Etihad Airways from London to Southeast Asia have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Entertainment

8.0

Food

7.7

Comfort

8.0

Overall

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered
Singapore Airlines
8.1
Very Good
1,367 reviews
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Entertainment

8.0

Food

7.7

Comfort

8.0

Overall

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered
Etihad Airways
7.4
Good
1,251 reviews
Singapore Airlines
8.1
Very Good
1,367 reviews
Check prices

Entertainment

8.0

Food

7.7

Comfort

8.0

Overall

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,July 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered

Related info for your journey

Find useful and relevant information for your journey from London to Southeast Asia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London to Southeast Asia?

    Shenzhen Airlines, KLM, and SWISS can get you from London to Southeast Asia in just under 14h 35m. Your travel time can differ by up to 15h 55m. Airlines will cover a distance of 10562 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines to fly from London to Southeast Asia one-way?

    The cheapet airlines for a one-way flight from London to Southeast Asia are SWISS ($673), Hainan Airlines ($679), and Etihad Airways ($702).

  • What are the most popular routes from London to Southeast Asia?

    While some choose either London Stansted - Denpasar Bali Ngurah Rai or London City - Phuket City, London City - Denpasar Bali Ngurah Rai is the most popular route from London to Southeast Asia.

  • What are the most reliable airlines from London to Southeast Asia?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from London to Southeast Asia on time: EVA Air (78%), Thai Airways (76%), Air Canada (69%).

  • What are the cheapest flights from London to Southeast Asia?

    On average you can expect to pay $1,477 for a flight from London to Southeast Asia. The cheapest flight overall is $1,191 while the most popular route, (London City - Denpasar Bali Ngurah Rai) is currently priced at $914.

  • Can I find deals for flights from London to Southeast Asia that include hotel bookings?

    Yes. In addition to deals on London to Southeast Asia flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Southeast Asia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Southeast Asia.

  • Can I find deals for business class flights from London to Southeast Asia?

    Yes. Cheapflights offers flight deals from London to Southeast Asia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London to Southeast Asia?

    Currently, February is the cheapest month in which you can book a flight from London to Southeast Asia (average of $489). Flying from London to Southeast Asia in December is currently the most expensive (average of $911). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to Southeast Asia

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Suvarnabhumi flights
Heathrow to Singapore flights
Gatwick to Suvarnabhumi flights

Top 2 airlines flying from London to Southeast Asia

Discover the top 2 airlines that operate flights from London to Southeast Asia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 18 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Etihad AirwaysCheapest$1,055Average$1,337FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Thai AirwaysCheapest$1,158Average$1,201FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to Southeast Asia?

When you search for this flight from London to Southeast Asia, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from London to Southeast Asia?

Cheapflights helps you find that perfect flight to Southeast Asia from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from London to Southeast Asia with no change fees?

Yes! Cheapflights helps users easily find flights from London to Southeast Asia with no change fees.

Can Cheapflights notify me if prices for flights from London to Southeast Asia become cheaper?

Not ready to book yet? You can track prices for flights from London to Southeast Asia on Cheapflights with our Price Alert feature and get notified when better prices are available.

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