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Cheap flights from London to Southeast Asia from $859

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 23/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BKK
5 Dec — 12 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from London to Southeast Asia

Enter your travel dates to find the best prices.

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 5 November 2025.

Tue 11/1117:05LCY - KUL
1 stop14h 35mKLM
Thu 11/1223:50KUL - LCY
1 stop15h 25mKLM
Deal found 3/11$1,019
Tue 11/1117:05LCY - KUL
1 stop14h 35mKLM
Tue 2/1223:50KUL - LCY
1 stop15h 25mKLM
Deal found 4/11$1,031
Tue 18/1110:00LCY - KUL
1 stop21h 40mKLM
Mon 8/1223:50KUL - LCY
1 stop15h 25mKLM
Deal found 4/11$1,041
Mon 1/1217:05LCY - KUL
1 stop14h 35mKLM
Mon 8/1223:50KUL - LCY
1 stop15h 25mKLM
Deal found 3/11$1,062
Sun 9/1113:45LCY - KUL
1 stop17h 55mKLM
Thu 13/1123:50KUL - LCY
1 stop16h 20mKLM
Deal found 3/11$1,068
Mon 24/1117:05LCY - KUL
1 stop14h 35mKLM
Mon 1/1223:50KUL - LCY
1 stop17h 00mKLM
Deal found 3/11$1,084
Sat 29/1108:40LCY - KUL
1 stop23h 00mKLM
Tue 2/1223:50KUL - LCY
1 stop15h 25mKLM
Deal found 4/11$1,111
Mon 10/1119:10LCY - DPS
2 stops21h 10mSWISS
Wed 4/310:30DPS - LCY
2 stops30h 10mSWISS
Deal found 3/11$1,216
Mon 1/1213:55STN - DPS
2 stops24h 55mMultiple Airlines
Mon 8/1219:15DPS - STN
3 stops29h 40mMultiple Airlines
Deal found 3/11$1,250
Wed 3/1219:10LCY - DPS
2 stops21h 10mSWISS
Wed 4/313:00DPS - LCY
2 stops27h 40mSWISS
Deal found 3/11$1,257
Mon 1/1206:25LTN - DPS
2 stops32h 25mMultiple Airlines
Mon 8/1219:15DPS - LTN
3 stops35h 05mMultiple Airlines
Deal found 3/11$1,265
Sun 16/1120:05LCY - DPS
2 stops40h 15mKLM
Tue 25/1121:40DPS - LCY
2 stops27h 40mKLM
Deal found 4/11$1,313

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 5 November 2025.

Round-trip from

$1,031

One-way from

$859

Popular in

December

Cheapest in

May

Average price

$1,225
KLM
  • KLM
  • 2/12-9/12
  • 2 total stops
  • 37h 05m total
  • London to Southeast Asia
Search Deals
SWISS
  • SWISS
  • 23/3
  • 2 total stops
  • 31h 55m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($202 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($70 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 5 November 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

LondonKuala Lumpur

LCY - KUL

LCYKUL

London City

Mon 1/12

17:05-15:40

1 stop14h 35m

Kuala Lumpur Intl

Mon 8/12

23:50-07:15

1 stop15h 25m

$1,062

LondonKuala Lumpur

LTN - KUL

LTNKUL

London Luton

Sat 7/2

06:00-17:20

2 stops27h 20m

Kuala Lumpur Intl

Fri 13/2

04:25-07:35

2 stops35h 10m

$1,122

LondonKuala Lumpur

LCY - KUL

LCYKUL

London City

Thu 4/12

17:05-18:45

2 stops17h 40m

Kuala Lumpur Intl

Fri 26/12

17:20-09:30

2 stops24h 10m

$1,208

LondonDenpasar

LCY - DPS

LCYDPS

London City

Thu 23/4

19:20-00:05

2 stops21h 45m

Denpasar Bali Ngurah Rai

Thu 7/5

13:05-12:30

2 stops30h 25m

$1,248

LondonDenpasar

LTN - DPS

LTNDPS

London Luton

Mon 1/12

06:25-22:50

2 stops32h 25m

Denpasar Bali Ngurah Rai

Mon 8/12

19:15-22:20

3 stops35h 05m

$1,265

LondonKuala Lumpur

LCY - KUL

LCYKUL

London City

Tue 2/12

10:00-15:40

1 stop21h 40m

Kuala Lumpur Intl

Sun 21/12

23:50-08:50

1 stop17h 00m

$1,303

LondonDenpasar

LCY - DPS

LCYDPS

London City

Fri 28/11

09:20-20:20

2 stops27h 00m

Denpasar Bali Ngurah Rai

Sun 7/12

21:40-17:20

2 stops27h 40m

$1,313

LondonDenpasar

LCY - DPS

LCYDPS

London City

Tue 18/11

17:05-20:20

2 stops19h 15m

Denpasar Bali Ngurah Rai

Thu 4/12

19:15-08:50

2 stops21h 35m

$1,316

LondonKuala Lumpur

LCY - KUL

LCYKUL

London City

Fri 30/1

09:20-15:40

1 stop22h 20m

Kuala Lumpur Intl

Sun 8/2

23:50-09:30

1 stop17h 40m

$1,334

LondonPhuket City

STN - HKT

STNHKT

London Stansted

Thu 19/2

14:05-19:40

1 stop22h 35m

Phuket City

Tue 24/3

19:05-12:05

1 stop24h 00m

$1,348

Flights are sorted by cheapest return flights first.

Deals found on 3/11

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, May is the cheapest month in which you can book a flight from London to Southeast Asia (average of $693). Flying from London to Southeast Asia in July is currently the most expensive (average of $1,076). 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 5 November 2025.

When flying from London to Southeast Asia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 26% versus a flight in the evening.

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 5 November 2025.

The most flights from LON to zzYJX are scheduled on a Tuesday (10 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (8 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 5 November 2025.
See what other customers who have flown with Singapore Airlines 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
1,391 reviews
Check prices

Food

7.7

Overall

8.1

Boarding

8.3

Comfort

8.0

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Juliet,Oct 2025

PUS - SIN

Very kind staff to arrange my luggage and really appreciate all help.
Singapore Airlines
8.1
Very Good
1,391 reviews
Singapore Airlines
8.1
Very Good
1,391 reviews
Check prices

Food

7.7

Overall

8.1

Boarding

8.3

Comfort

8.0

Crew

8.6

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Juliet,Oct 2025

PUS - SIN

Very kind staff to arrange my luggage and really appreciate all help.

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?

    KLM, SWISS, and Emirates can get you from London to Southeast Asia in just under 14h 35m. Your travel time can differ by up to 8h. 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 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 (81%), Thai Airways (78%), Air Canada (73%).

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

    On average you can expect to pay $1,658 for a flight from London to Southeast Asia. The cheapest flight overall is $1,035 while the most popular route, (London City - Denpasar Bali Ngurah Rai) is currently priced at $938.

  • 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, May is the cheapest month in which you can book a flight from London to Southeast Asia (average of $693). Flying from London to Southeast Asia in July is currently the most expensive (average of $1,076). 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 Singapore flights
Gatwick to Suvarnabhumi flights
Heathrow 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 5 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Etihad AirwaysCheapest$1,082Average$1,445FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Thai AirwaysCheapest$1,187Average$1,232FlexibilityNo 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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