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Cheap flights from London to Southeast Asia from $512

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 25/4. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BKK
10 Apr — 17 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap 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 11 March 2026.

Wed 13/521:20
LHR
-
BKK
1 stop18h 35m
China Eastern
Mon 18/505:05
BKK
-
LHR
1 stop19h 35m
China Eastern
Deal found 11/3$810
Mon 4/522:05
LHR
-
BKK
1 stop22h 10m
Shenzhen Airlines
Sun 17/503:15
BKK
-
LHR
1 stop22h 35m
Shenzhen Airlines
Deal found 9/3$813
Tue 12/521:20
LHR
-
BKK
1 stop33h 10m
China Eastern
Mon 18/503:00
BKK
-
LHR
2 stops21h 40m
China Eastern
Deal found 10/3$815
Tue 5/521:20
LHR
-
BKK
1 stop17h 35m
China Eastern
Tue 12/503:00
BKK
-
LHR
2 stops21h 40m
China Eastern
Deal found 7/3$816
Tue 8/921:20
LHR
-
BKK
1 stop22h 35m
China Eastern
Tue 10/1107:50
BKK
-
LHR
2 stops40h 40m
China Eastern
Deal found 9/3$817
Tue 5/521:20
LHR
-
BKK
1 stop21h 20m
China Eastern
Mon 11/503:00
BKK
-
LHR
2 stops21h 40m
China Eastern
Deal found 9/3$819
Wed 6/521:20
LHR
-
BKK
1 stop17h 35m
China Eastern
Wed 17/607:50
BKK
-
LHR
2 stops40h 50m
China Eastern
Deal found 10/3$820
Sat 13/622:05
LHR
-
BKK
1 stop31h 05m
Shenzhen Airlines
Sat 20/612:10
BKK
-
LHR
1 stop37h 50m
Shenzhen Airlines
Deal found 9/3$823
Fri 1/522:05
LHR
-
BKK
1 stop31h 05m
Shenzhen Airlines
Sun 10/503:15
BKK
-
LHR
1 stop22h 35m
Shenzhen Airlines
Deal found 10/3$824
Sun 31/522:05
LHR
-
BKK
1 stop22h 10m
Shenzhen Airlines
Tue 9/612:10
BKK
-
LHR
1 stop37h 50m
Shenzhen Airlines
Deal found 6/3$826
Mon 27/422:05
LHR
-
BKK
1 stop22h 10m
Shenzhen Airlines
Sat 9/519:15
BKK
-
LHR
1 stop30h 45m
Shenzhen Airlines
Deal found 9/3$827
Fri 29/522:05
LHR
-
BKK
1 stop38h 10m
Shenzhen Airlines
Thu 25/603:15
BKK
-
LHR
1 stop22h 45m
Shenzhen Airlines
Deal found 8/3$829

Find 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 11 March 2026.

Round-trip from

$813

One-way from

$512

Popular in

July

Cheapest in

May

Average price

$1,180
Shenzhen Airlines
  • Shenzhen Airlines
  • 4/5-17/5
  • 2 total stops
  • 44h 45m total
  • London to Southeast Asia
Search Deals
25/4
  • 25/4
  • 2 total stops
  • 23h 00m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($213 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($50 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
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 11 March 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

Cheapest return flight

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 3/5

21:20-04:05

1 stop24h 45m

Bangkok Suvarnabhumi

Mon 18/5

07:50-18:40

2 stops40h 50m

$815

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 13/4

21:20-00:40

1 stop21h 20m

Bangkok Suvarnabhumi

Sun 24/5

03:00-18:40

2 stops21h 40m

$815

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 3/5

21:20-01:55

1 stop22h 35m

Bangkok Suvarnabhumi

Wed 13/5

20:50-18:40

2 stops27h 50m

$819

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 25/4

22:05-02:15

1 stop22h 10m

Bangkok Suvarnabhumi

Fri 22/5

12:10-19:50

1 stop37h 40m

$826

LondonKuala Lumpur

LTN - KUL

LTNKUL

London Luton

Thu 23/4

17:30-19:45

2 stops19h 15m

Kuala Lumpur Intl

Thu 30/4

09:50-22:40

2 stops19h 50m

$1,027

LondonKuala Lumpur

LTN - KUL

LTNKUL

London Luton

Sat 25/4

14:25-19:45

2 stops22h 20m

Kuala Lumpur Intl

Sat 2/5

09:50-00:30

2 stops21h 40m

$1,083

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 9/5

20:50-17:45

1 stop14h 55m

Bangkok Suvarnabhumi

Thu 16/7

09:00-19:10

1 stop16h 10m

$1,102

LondonDenpasar

LTN - DPS

LTNDPS

London Luton

Tue 21/4

06:35-11:25

2 stops21h 50m

Denpasar Bali Ngurah Rai

Tue 28/4

14:05-14:35

3 stops31h 30m

$1,121

LondonKuala Lumpur

LTN - KUL

LTNKUL

London Luton

Wed 22/4

12:45-19:45

2 stops24h 00m

Kuala Lumpur Intl

Thu 30/4

09:50-22:40

2 stops19h 50m

$1,173

LondonDenpasar

LTN - DPS

LTNDPS

London Luton

Fri 10/4

07:30-23:55

2 stops33h 25m

Denpasar Bali Ngurah Rai

Fri 17/4

11:15-14:35

3 stops34h 20m

$1,199

Flights are sorted by cheapest return flights first.

Deals found on 10/3

Showing 1-10 of 60 resultsSorted by cheapest first
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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, November is the cheapest month in which you can book a flight from London to Southeast Asia (average of $573). Flying from London to Southeast Asia in July is currently the most expensive (average of $777). 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 11 March 2026.

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 at midday, which can drop the price by up to 47% versus a flight in the morning.

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 11 March 2026.

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).

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?

    China Eastern, Shenzhen Airlines, and Oman Air can get you from London to Southeast Asia in just under 14h 55m. Your travel time can differ by up to 9h 50m. Airlines will cover a distance of 9571 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: Thai Airways (88%), Air Canada (85%), EVA Air (85%).

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

    On average you can expect to pay $1,435 for a flight from London to Southeast Asia. The cheapest flight overall is $769 while the most popular route, (London City - Denpasar Bali Ngurah Rai) is currently priced at $858.

  • 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, November is the cheapest month in which you can book a flight from London to Southeast Asia (average of $573). Flying from London to Southeast Asia in July is currently the most expensive (average of $777). 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
Gatwick to Suvarnabhumi flights
Heathrow to Singapore flights

Top airline flying from London to Southeast Asia

Discover the top airline 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 11 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Thai AirwaysCheapest$1,087Average$1,117FlexibilityNo 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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