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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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
25 Dec — 1 Jan1
1 adult
1 adult, Economy, 0 bags

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 25 November 2025.

Round-trip from

£395

One-way from

£254

Popular in

December

Cheapest in

May

Average price

£608
China Eastern
  • China Eastern
  • 13/1-19/1
  • 2 total stops
  • 43h 30m total
  • London to Southeast Asia
Search Deals
Shenzhen Airlines
  • Shenzhen Airlines
  • 9/1
  • 1 total stop
  • 21h 00m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£47 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 November 2025
Search Deals

Find flight deals from Heathrow to Southeast Asia

Enter your travel dates to find the best prices.

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 25 November 2025.

Fri 28/1121:10LHR - HAN
1 stop28h 30mMultiple Airlines
Fri 12/1220:40HAN - LHR
2 stops27h 50mMultiple Airlines
Deal found 23/11£389
Thu 27/1121:35LHR - HAN
2 stops30h 40mAir China
Fri 5/1213:30HAN - LHR
1 stop35h 20mAir China
Deal found 24/11£395
Fri 28/1121:00LHR - HAN
1 stop21h 45mChina Eastern
Mon 26/118:45HAN - LHR
1 stop29h 45mChina Eastern
Deal found 22/11£397
Wed 26/1121:00LHR - HAN
1 stop21h 45mChina Eastern
Wed 10/1218:45HAN - LHR
1 stop29h 45mChina Eastern
Deal found 21/11£398
Tue 2/1221:00LHR - HAN
1 stop21h 45mChina Eastern
Mon 8/1202:45HAN - LHR
1 stop21h 45mChina Eastern
Deal found 24/11£398
Tue 25/1121:00LHR - HAN
1 stop34h 10mChina Eastern
Mon 1/1202:45HAN - LHR
1 stop21h 45mChina Eastern
Deal found 23/11£400
Mon 24/1121:00LHR - HAN
1 stop21h 45mChina Eastern
Mon 1/1218:45HAN - LHR
1 stop29h 45mChina Eastern
Deal found 23/11£401
Thu 27/1121:00LHR - HAN
1 stop37h 45mChina Eastern
Thu 11/1215:10HAN - LHR
1 stop33h 20mChina Eastern
Deal found 22/11£402
Tue 25/1121:00LHR - HAN
1 stop21h 45mChina Eastern
Wed 3/1218:45HAN - LHR
1 stop29h 45mChina Eastern
Deal found 22/11£403
Wed 26/1121:00LHR - HAN
1 stop21h 45mChina Eastern
Sun 14/1218:45HAN - LHR
1 stop29h 45mChina Eastern
Deal found 22/11£404
Sun 23/1121:00LHR - HAN
1 stop21h 45mChina Eastern
Sat 6/1202:45HAN - LHR
1 stop21h 45mChina Eastern
Deal found 23/11£405
Sun 7/1221:15LHR - BKK
1 stop29h 50mHainan Airlines
Sat 13/1219:10BKK - LHR
1 stop29h 45mHainan Airlines
Deal found 24/11£472

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 25 November 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

Sun 1/2

21:10-01:10

1 stop21h 00m

Hanoi Noibai

Thu 26/2

02:10-19:10

1 stop24h 00m

£465

LondonHanoi

LHR - HAN

LHRHAN

London Heathrow

Mon 2/2

21:10-08:40

1 stop28h 30m

Hanoi Noibai

Sun 22/2

02:10-19:10

1 stop24h 00m

£465

LondonHanoi

LHR - HAN

LHRHAN

London Heathrow

Mon 5/1

21:10-08:40

1 stop28h 30m

Hanoi Noibai

Sun 1/2

14:55-19:10

1 stop35h 15m

£466

LondonHanoi

LHR - HAN

LHRHAN

London Heathrow

Sat 24/1

21:10-08:40

1 stop28h 30m

Hanoi Noibai

Sun 8/2

19:40-19:10

1 stop30h 30m

£466

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 23/2

20:55-09:35

1 stop28h 40m

Singapore Changi

Wed 25/2

19:25-14:30

1 stop27h 05m

£519

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Wed 11/3

19:20-23:35

1 stop21h 15m

Phuket City

Tue 24/3

00:25-12:05

1 stop18h 40m

£521

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 23/2

09:30-12:30

1 stop19h 00m

Singapore Changi

Tue 24/2

04:40-16:20

1 stop19h 40m

£524

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sun 11/1

21:50-12:30

1 stop30h 40m

Singapore Changi

Sun 3/5

20:00-06:55

1 stop17h 55m

£527

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sat 24/1

09:30-12:30

1 stop19h 00m

Singapore Changi

Tue 10/2

20:00-06:35

1 stop18h 35m

£533

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Thu 5/3

20:55-19:35

1 stop14h 40m

Kuala Lumpur Intl

Thu 19/3

09:35-18:10

1 stop16h 35m

£534

Flights are sorted by cheapest return flights first.

Deals found on 22/11

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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Southeast Asia (average of £386). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of £565). 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 25 November 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Southeast Asia in the afternoon. If you’re flexible enough to do this you can expect to save up to 21% on your trip compared to booking a flight at midday.

What is the cheapest day to fly from London Heathrow Airport to Southeast Asia?

Use this chart to determine the cheapest time to fly return from Heathrow to Southeast Asia. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London Heathrow Airport to Southeast Asia flight should consider departing on Saturday afternoons when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 25 November 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 25 November 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
1,409 reviews
Check prices

Comfort

8.0

Overall

8.1

Crew

8.6

Food

7.8

Boarding

8.3

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Singapore Airlines
8.1
Very Good
1,409 reviews
Singapore Airlines
8.1
Very Good
1,409 reviews
Check prices

Comfort

8.0

Overall

8.1

Crew

8.6

Food

7.8

Boarding

8.3

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Cathay Pacific
7.6
Good
1,068 reviews
Singapore Airlines
8.1
Very Good
1,409 reviews
Check prices

Comfort

8.0

Overall

8.1

Crew

8.6

Food

7.8

Boarding

8.3

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Qatar Airways
7.4
Good
3,672 reviews
Singapore Airlines
8.1
Very Good
1,409 reviews
Check prices

Comfort

8.0

Overall

8.1

Crew

8.6

Food

7.8

Boarding

8.3

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Etihad Airways
7.4
Good
1,312 reviews
Singapore Airlines
8.1
Very Good
1,409 reviews
Check prices

Comfort

8.0

Overall

8.1

Crew

8.6

Food

7.8

Boarding

8.3

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Air China
7.2
Good
126 reviews
Singapore Airlines
8.1
Very Good
1,409 reviews
Check prices

Comfort

8.0

Overall

8.1

Crew

8.6

Food

7.8

Boarding

8.3

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.

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 Gulf Air can get you from London Heathrow Airport to Southeast Asia in just under 21h. Your travel time can differ by up to 9h 40m. The distance between London Heathrow Airport and Southeast Asia is about 5736 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 Shenzhen Airlines, with whom users have recently found tickets for as low as £256. However, be on the lookout for offers from China Eastern and Air China, 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 (85%), Thai Airways (82%) and Air Canada (78%).

  • 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 £2,479, our data indicates the cheapest price to be £470. The most popular route (London Heathrow - Bangkok Suvarnabhumi), is priced around £362.

  • 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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Southeast Asia (average of £386). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of £565). 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.
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Stansted to New Delhi flights
Stansted to Manila flights
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Stansted to Mumbai flights
Stansted to Colombo flights
London City to Haneda flights
Heathrow to Bangalore flights
Heathrow to Hyderabad flights
London City to Manila flights
Gatwick to Singapore flights
Stansted to Haneda flights
Heathrow to Dhaka flights
Stansted to Islamabad flights
Heathrow to Ahmedabad flights
Gatwick to Phuket City flights
Gatwick to Lahore flights
Gatwick to Kuala Lumpur Intl flights
Heathrow to Malé flights
Heathrow to Hanoi flights
London City to Kuala Lumpur Intl flights
Heathrow to Chennai flights
Heathrow to Denpasar flights
Gatwick to Hong Kong flights
Stansted to Phuket City 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 25 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Hainan AirlinesCheapest£387Average£451FlexibilityNo cancel feeOn-time61%
Search Hainan Airlines flights
KLMCheapest£427Average£804FlexibilityNo cancel feeOn-time75%
Search KLM flights
Royal Brunei AirlinesCheapest£438Average£585FlexibilityNo cancel feeOn-time84%
Search Royal Brunei Airlines flights
LufthansaCheapest£441Average£677FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
SWISSCheapest£443Average£733FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Austrian AirlinesCheapest£451Average£815FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
FinnairCheapest£463Average£796FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Norse Atlantic UKCheapest£467Average£571FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
Hahn AirCheapest£492Average£699FlexibilityNo cancel feeOn-timeN/A
Search Hahn Air flights
IndiGoCheapest£541Average£722FlexibilityNo cancel feeOn-time80%
Search IndiGo 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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