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Cheap flights from London Heathrow Airport to Southeast Asia from £254

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 21/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
15 Oct — 22 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Heathrow to Southeast Asia

Keep the following information in mind while searching for Heathrow to Southeast Asia flight deals. Data was last updated 15 September 2025.

Round-trip from

£393

One-way from

£254

Popular in

December

Cheapest in

May

Average price

£541
Air China
  • Air China
  • 28/10-27/11
  • 2 total stops
  • 70h 45m total
  • London to Southeast Asia
Search Deals
Shenzhen Airlines
  • Shenzhen Airlines
  • 21/9
  • 1 total stop
  • 22h 15m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£45 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Heathrow to Southeast Asia

Cheapest flights from Heathrow to Southeast Asia
Explore the most affordable flight options available from Heathrow to Southeast Asia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2025.

Tue 28/1017:40LHR - HAN
1 stop35h 15mAir China
Thu 27/1113:20HAN - LHR
1 stop35h 30mAir China
Deal found 13/9£393
Mon 1/1220:25LHR - HAN
1 stop32h 35mAir China
Sun 14/1213:20HAN - LHR
1 stop35h 30mAir China
Deal found 13/9£396
Mon 27/1020:25LHR - HAN
1 stop32h 35mAir China
Mon 17/1113:20HAN - LHR
1 stop35h 30mAir China
Deal found 14/9£397
Wed 29/1020:25LHR - HAN
1 stop32h 35mAir China
Wed 5/1113:30HAN - LHR
1 stop35h 20mAir China
Deal found 14/9£400
Tue 14/1022:40LHR - HAN
1 stop31h 15mAir China
Wed 22/1013:25HAN - LHR
1 stop37h 05mAir China
Deal found 14/9£400
Tue 28/1020:25LHR - HAN
1 stop32h 30mAir China
Tue 4/1113:20HAN - LHR
1 stop35h 30mAir China
Deal found 13/9£401
Tue 14/1022:40LHR - HAN
1 stop31h 15mAir China
Sun 26/1013:20HAN - LHR
1 stop35h 30mAir China
Deal found 13/9£403
Tue 14/1022:40LHR - HAN
1 stop31h 15mAir China
Tue 28/1013:20HAN - LHR
1 stop35h 30mAir China
Deal found 13/9£405
Sun 23/1117:40LHR - HAN
1 stop35h 15mAir China
Sun 7/1213:20HAN - LHR
1 stop33h 35mAir China
Deal found 13/9£406
Tue 14/1022:40LHR - HAN
1 stop31h 15mAir China
Wed 29/1013:30HAN - LHR
1 stop33h 25mAir China
Deal found 14/9£407
Wed 15/1022:40LHR - HAN
1 stop31h 15mAir China
Wed 29/1013:30HAN - LHR
1 stop35h 20mAir China
Deal found 13/9£409
Wed 24/922:05LHR - HAN
1 stop28h 35mShenzhen Airlines
Tue 11/1119:40HAN - LHR
1 stop30h 30mShenzhen Airlines
Deal found 14/9£410

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow 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 858,174 searches. Data last updated 15 September 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Southeast Asia that are best for you.

Fly from

Heathrow

Fly to

Southeast Asia

Route

Depart

Return

Price

LondonHanoi

LHR - HAN

LHRHAN

London Heathrow

Sat 27/9

22:05-01:10

1 stop21h 05m

Hanoi Noibai

Sun 5/10

15:05-19:50

1 stop34h 45m

£411

LondonHanoi

LHR - HAN

LHRHAN

London Heathrow

Sun 28/9

22:05-01:10

1 stop21h 05m

Hanoi Noibai

Tue 21/10

18:40-20:00

1 stop31h 20m

£411

LondonHo Chi Minh City

LHR - SGN

LHRSGN

London Heathrow

Sat 1/11

21:10-01:50

1 stop21h 40m

Ho Chi Minh City

Thu 20/11

02:50-19:10

1 stop23h 20m

£461

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sun 21/9

09:30-09:40

1 stop17h 10m

Singapore Changi

Mon 29/9

21:10-18:45

1 stop28h 35m

£490

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 6/11

19:20-09:35

1 stop30h 15m

Singapore Changi

Mon 10/11

19:25-06:40

1 stop19h 15m

£491

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 28/10

14:25-18:00

2 stops19h 35m

Singapore Changi

Thu 6/11

00:05-08:05

1 stop16h 00m

£495

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Fri 21/11

20:05-18:00

1 stop37h 55m

Singapore Changi

Sat 6/12

00:05-13:40

2 stops21h 35m

£495

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sun 21/9

09:30-09:40

1 stop17h 10m

Singapore Changi

Thu 9/10

21:10-07:00

1 stop16h 50m

£505

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 11/11

08:50-09:35

1 stop16h 45m

Singapore Changi

Sun 30/11

19:25-06:40

1 stop19h 15m

£510

LondonHo Chi Minh City

LHR - SGN

LHRSGN

London Heathrow

Fri 14/11

21:10-01:50

1 stop21h 40m

Ho Chi Minh City

Sun 30/11

02:50-19:10

1 stop23h 20m

£515

Flights are sorted by cheapest return flights first.

Deals found on 14/9

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

Have a flexible travel schedule? Discover the best time to fly to Southeast Asia from Heathrow 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 Heathrow Airport to Southeast Asia

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

Currently, May is the cheapest month in which you can book a flight from London Heathrow Airport to Southeast Asia (average of £717). Flying from London Heathrow Airport to Southeast Asia in December is currently the most expensive (average of £1,123). 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 LHR to YJX?

Find hourly flight availability from Heathrow 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 15 September 2025.

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

Weekly flight availability from London Heathrow Airport to Southeast Asia

Explore weekly flight availability from Heathrow 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 15 September 2025.

The most flights from LHR 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 15 September 2025.
Check out reviews from past customers who have flown with Singapore Airlines, Cathay Pacific, andQatar Airways from London Heathrow Airport to Southeast Asia to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very Good
1,365 reviews
Check prices

Comfort

8.0

Overall

8.1

Food

7.7

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Singapore Airlines
8.1
Very Good
1,365 reviews
Singapore Airlines
8.1
Very Good
1,365 reviews
Check prices

Comfort

8.0

Overall

8.1

Food

7.7

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Cathay Pacific
7.6
Good
993 reviews
Singapore Airlines
8.1
Very Good
1,365 reviews
Check prices

Comfort

8.0

Overall

8.1

Food

7.7

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Qatar Airways
7.4
Good
3,624 reviews
Singapore Airlines
8.1
Very Good
1,365 reviews
Check prices

Comfort

8.0

Overall

8.1

Food

7.7

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Etihad Airways
7.4
Good
1,250 reviews
Singapore Airlines
8.1
Very Good
1,365 reviews
Check prices

Comfort

8.0

Overall

8.1

Food

7.7

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.
Air China
7.2
Good
99 reviews
Singapore Airlines
8.1
Very Good
1,365 reviews
Check prices

Comfort

8.0

Overall

8.1

Food

7.7

Crew

8.6

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.

Related info for your journey

Find useful and relevant information for your journey from Heathrow 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 Heathrow Airport to Southeast Asia?

    Shenzhen Airlines, Etihad Airways, and SWISS can get you from London Heathrow Airport to Southeast Asia in just under 17h 10m. Your travel time can differ by up to 16h 50m. The distance between London Heathrow Airport and Southeast Asia is about 6757 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    The cheapest airline one-way is Air China, with whom users have recently found tickets for as low as £286. However, be on the lookout for offers from China Southern and Shenzhen Airlines, as they are both options that can get you from London Heathrow Airport to Southeast Asia for a low price.

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

    While some choose either London Heathrow - Kuala Lumpur Intl or London Heathrow - Manila Ninoy Aquino Intl, London Heathrow - Bangkok Suvarnabhumi is the most popular route from London Heathrow Airport to Southeast Asia.

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

    The top 3 most reliable airlines when flying from London Heathrow Airport to Southeast Asia are EVA Air (82%), Thai Airways (77%) and Air Canada (69%).

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

    Looking for the cheapest flight from London Heathrow Airport to Southeast Asia? While on average our users pay £2,666, our data indicates the cheapest price to be £408. The most popular route (London Heathrow - Bangkok Suvarnabhumi), is priced around £391.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow 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 Heathrow Airport to Southeast Asia?

    Currently, May is the cheapest month in which you can book a flight from London Heathrow Airport to Southeast Asia (average of £717). Flying from London Heathrow Airport to Southeast Asia in December is currently the most expensive (average of £1,123). 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

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Alternative routes for Heathrow to Southeast Asia

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Suvarnabhumi flights
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London City to Haneda flights
Luton to Suvarnabhumi flights
Heathrow to Incheon Intl flights
Heathrow to Singapore flights
London City to Narita flights
Heathrow to Phuket City flights
Gatwick to Manila flights
Gatwick to Singapore flights
Stansted to Manila flights
Heathrow to Islamabad flights
Gatwick to New Delhi flights
Gatwick to Colombo flights
Gatwick to Kuala Lumpur Intl flights
Stansted to New Delhi flights
Stansted to Colombo flights
Gatwick to Mumbai flights
Stansted to Kuala Lumpur Intl flights
Heathrow to Lahore flights
Stansted to Mumbai flights
Heathrow to Ahmedabad flights
Gatwick to Hong Kong flights
London City to Manila flights
Heathrow to Ho Chi Minh City flights
London City to Kuala Lumpur Intl flights
Gatwick to Phuket City flights
Heathrow to Denpasar flights
London City to Hong Kong flights
Stansted to Hong Kong flights
Heathrow to Taiwan Taoyuan Intl flights
Heathrow to Hongqiao Intl flights
Heathrow to Gimpo Intl flights
Stansted to Phuket City flights
Heathrow to Hyderabad flights
Heathrow to Bangalore flights

Top 10 airlines flying from Heathrow to Southeast Asia

Discover the top 10 airlines that operate flights from Heathrow 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 858,174 searches. Data last updated 15 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£345Average£561FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
Hainan AirlinesCheapest£374Average£442FlexibilityNo cancel feeOn-time61%
Search Hainan Airlines flights
KLMCheapest£412Average£816FlexibilityNo cancel feeOn-time75%
Search KLM flights
SWISSCheapest£422Average£714FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Royal Brunei AirlinesCheapest£423Average£573FlexibilityNo cancel feeOn-time84%
Search Royal Brunei Airlines flights
LufthansaCheapest£436Average£699FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£450Average£794FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
FinnairCheapest£450Average£806FlexibilityNo cancel feeOn-time76%
Search Finnair flights
A.P.G.Cheapest£530Average£596FlexibilityNo cancel feeOn-timeN/A
Search A.P.G. flights
Royal JordanianCheapest£536Average£711FlexibilityNo cancel feeOn-time61%
Search Royal Jordanian 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 Heathrow to Southeast Asia?

When you search for this flight from Heathrow 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 Heathrow to Southeast Asia?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Southeast Asia from Heathrow.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Heathrow to Southeast Asia, users can toggle the no change fees filter when performing a flight search.

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

Yes! Start tracking prices for Heathrow to Southeast Asia flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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