HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Southeast Asia

$351+ Cheap flights from London (LON) to Southeast Asia

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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BKK
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from London to Southeast Asia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 15, 2025.

Round-trip from

$552
(Gotogate)

One-way from

$351
(Mytrip)

Popular in

December

Cheapest in

November

Average price

$764
From London (LON) to Southeast Asia
Search Deals
One-way flight from London (LON) to Southeast Asia
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 15, 2025.

This Gotogate deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/18:25 pmLHR - HAN
1 stop32h 35mAir China
Sat 12/131:20 pmHAN - LHR
1 stop33h 35mAir China
Deal found 9/14$552
This Shenzhen Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Shenzhen Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/110:05 pmLHR - HAN
1 stop34h 00mShenzhen Airlines
Thu 10/93:05 pmHAN - LHR
1 stop34h 55mShenzhen Airlines
Deal found 9/15$556
This Shenzhen Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Shenzhen Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1710:05 pmLHR - HAN
1 stop21h 05mShenzhen Airlines
Sat 10/112:10 amHAN - LHR
1 stop23h 50mShenzhen Airlines
Deal found 9/15$557
This Air China deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air China is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/175:40 pmLHR - SGN
1 stop24h 30mAir China
Mon 12/15:00 amSGN - LHR
1 stop19h 50mAir China
Deal found 9/14$570
This Air China deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air China is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/148:25 pmLHR - HAN
1 stop33h 30mAir China
Thu 11/61:20 pmHAN - LHR
1 stop33h 35mAir China
Deal found 9/14$575
This Trip.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/169:45 amLHR - SGN
1 stop28h 10mAir India
Thu 10/98:55 pmSGN - LHR
1 stop16h 35mAir India
Deal found 9/14$580
This Air China deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air China is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/275:40 pmLHR - BKK
1 stop17h 25mAir China
Sun 12/211:30 amBKK - LHR
1 stop23h 20mAir China
Deal found 9/15$588
This Shenzhen Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Shenzhen Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2410:05 pmLHR - SGN
1 stop21h 15mShenzhen Airlines
Fri 10/172:20 amSGN - LHR
1 stop23h 30mShenzhen Airlines
Deal found 9/15$589
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/36:35 amLGW - BKK
1 stop15h 45mMultiple Airlines
Thu 12/2512:25 pmBKK - LGW
Nonstop12h 55mMultiple Airlines
Deal found 9/15$591
This China Southern deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure China Southern is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2810:00 pmLHR - BKK
1 stop33h 30mChina Southern
Fri 12/268:20 amBKK - LHR
1 stop17h 15mChina Southern
Deal found 9/15$593
This Shenzhen Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Shenzhen Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2410:05 pmLHR - HAN
1 stop21h 05mShenzhen Airlines
Fri 10/172:10 amHAN - LHR
1 stop23h 40mShenzhen Airlines
Deal found 9/15$594
This Trip.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/129:50 pmLGW - BKK
2 stops42h 50mMultiple Airlines
Mon 11/312:30 pmBKK - LGW
Nonstop13h 00mMultiple Airlines
Deal found 9/14$596

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated September 15, 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 11/2

9:10 pm-11:10 am

1 stop31h 00m

Bangkok Suvarnabhumi

Sat 11/29

3:15 am-7:10 pm

1 stop22h 55m

$604

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 10/30

5:50 pm-5:25 pm

1 stop15h 35m

Singapore Changi

Wed 11/5

12:05 am-8:05 am

1 stop16h 00m

$615

LondonHo Chi Minh City

LHR - SGN

LHRSGN

London Heathrow

Sat 10/4

10:05 pm-1:20 am

1 stop21h 15m

Ho Chi Minh City

Sat 10/25

2:50 am-8:10 pm

1 stop23h 20m

$625

LondonHo Chi Minh City

LHR - SGN

LHRSGN

London Heathrow

Sat 11/1

9:10 pm-1:50 am

1 stop21h 40m

Ho Chi Minh City

Thu 11/20

2:50 am-7:10 pm

1 stop23h 20m

$625

LondonHanoi

LHR - HAN

LHRHAN

London Heathrow

Sun 10/26

9:10 pm-8:40 am

1 stop28h 30m

Hanoi Noibai

Tue 11/4

7:40 pm-7:10 pm

1 stop30h 30m

$630

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 10/30

8:50 am-9:35 am

1 stop16h 45m

Singapore Changi

Fri 11/14

7:25 pm-6:40 am

1 stop19h 15m

$664

LondonBangkok

LGW - BKK

LGWBKK

London Gatwick

Tue 11/4

4:00 pm-10:25 am

Nonstop11h 25m

Bangkok Suvarnabhumi

Mon 11/17

12:30 pm-6:30 pm

Nonstop13h 00m

$684

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Fri 10/31

8:50 am-9:35 am

1 stop16h 45m

Singapore Changi

Thu 11/13

7:25 pm-2:30 pm

1 stop27h 05m

$691

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 10/28

8:50 am-9:35 am

1 stop16h 45m

Singapore Changi

Sat 11/15

7:25 pm-6:40 am

1 stop19h 15m

$691

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 10/30

8:50 am-9:35 am

1 stop16h 45m

Singapore Changi

Sat 11/15

7:25 pm-6:40 am

1 stop19h 15m

$691

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 60 results
1
2
3
...
6

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 round-trip 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, September is the cheapest month in which you can book a flight from London to Southeast Asia (average of $900). Flying from London to Southeast Asia in December is currently the most expensive (average of $1,507). 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 September 15, 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 September 15, 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 September 15, 2025.
Read through reviews of airlines operating flights from London to Southeast Asia, such as Singapore Airlines, China Southern, and Qatar Airways. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 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
1,365 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 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
China Southern
7.5
Good
110 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 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
Qatar Airways
7.4
Good
3,624 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 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
China Eastern
7.2
Good
165 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 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
Air China
7.2
Good
99 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 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, Etihad Airways, and Norse Atlantic UK can get you from London to Southeast Asia in just under 11h 25m. Your travel time can differ by up to 19h 35m. The distance from London to Southeast Asia is about 5942 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    To fly one-way, consider booking your trip with Air China, which is currently one of the cheapest options available, starting at $399. China Eastern flights start at $400 while deals on Shenzhen Airlines start at $412 one-way.

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

    When deciding which route to take from London to Southeast Asia consider London Heathrow - Bangkok Suvarnabhumi, London Gatwick - Bangkok Suvarnabhumi or London Heathrow - Langkawi as they are the most popular.

  • 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 (82%), Thai Airways (77%), Air Canada (69%).

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

    On average you can expect to pay $2,696 for a flight from London to Southeast Asia. The cheapest flight overall is $652 while the most popular route, (London Heathrow - Bangkok Suvarnabhumi) is currently priced at $604.

  • 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 vacation 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, September is the cheapest month in which you can book a flight from London to Southeast Asia (average of $900). Flying from London to Southeast Asia in December is currently the most expensive (average of $1,507). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 Haneda flights
Heathrow to Narita flights
Heathrow to New Delhi flights
Heathrow to Hong Kong flights
Heathrow to Mumbai flights
Heathrow to Manila flights
Gatwick to Singapore flights
Heathrow to Kuala Lumpur Intl flights
Heathrow to Incheon Intl flights
Heathrow to Phuket City flights
Heathrow to Hongqiao Intl flights
Heathrow to Hanoi flights
Heathrow to Ho Chi Minh City flights
Heathrow to Taiwan Taoyuan Intl flights
London City to New Delhi flights
Heathrow to Singapore flights
Heathrow to Denpasar flights
Heathrow to Islamabad flights
Heathrow to Chennai flights
Gatwick to Pu Dong flights
Heathrow to Pu Dong flights
Heathrow to Capital flights
Gatwick to Hong Kong flights
Heathrow to Soekarno-Hatta Intl flights
Heathrow to Lahore flights
Heathrow to Karachi flights
Heathrow to Ahmedabad flights
Birmingham to Suvarnabhumi flights

Top 10 airlines flying from London to Southeast Asia

Discover the top 10 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 2,558,603 searches. Data last updated September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
SAUDIACheapest$407Average$821FlexibilityNo cancel feeOn-time86%
Shenzhen AirlinesCheapest$457Average$568FlexibilityNo cancel feeOn-time63%
China EasternCheapest$519Average$667FlexibilityNo cancel feeOn-time62%
Norse Atlantic UKCheapest$533Average$700FlexibilityNo cancel feeOn-timeN/A
China SouthernCheapest$555Average$754FlexibilityNo cancel feeOn-time69%
Hainan AirlinesCheapest$560Average$636FlexibilityNo cancel feeOn-time61%
Air IndiaCheapest$590Average$835FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$620Average$1,003FlexibilityNo cancel feeOn-time70%
Gulf AirCheapest$625Average$789FlexibilityNo cancel feeOn-time67%
Austrian AirlinesCheapest$641Average$1,087FlexibilityNo cancel feeOn-time78%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.