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Cheap flights from London Heathrow Airport to Southeast Asia from £296

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 22/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
17 Jul — 24 Jul1
1 adult

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 12 July 2025.

Round-trip from

£478

One-way from

£296

Popular in

December

Cheapest in

May

Average price

£829
Air India
  • Air India
  • 5/9-20/9
  • 2 total stops
  • 62h 30m total
  • London to Southeast Asia
Search Deals
Hainan Airlines
  • Hainan Airlines
  • 22/9
  • 2 total stops
  • 30h 00m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£43 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 July 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 12 July 2025.

Fri 5/912:30LHR - SIN
1 stop23h 00mAir India
Sat 20/923:00SIN - LHR
1 stop39h 30mAir India
Deal found 10/7£478
Wed 1/1022:05LHR - SIN
1 stop31h 15mGulf Air
Tue 28/1020:25SIN - LHR
1 stop18h 10mGulf Air
Deal found 10/7£480
Wed 5/1114:25LHR - SIN
2 stops19h 25mSWISS
Tue 25/1100:05SIN - LHR
1 stop16h 00mSWISS
Deal found 11/7£481
Sat 4/1021:00LHR - SIN
2 stops32h 15mChina Southern
Mon 27/1003:55SIN - LHR
1 stop22h 20mChina Southern
Deal found 12/7£481
Mon 6/1017:50LHR - SIN
1 stop15h 50mMultiple Airlines
Sun 26/1000:05SIN - LHR
1 stop19h 10mMultiple Airlines
Deal found 12/7£484
Tue 2/917:50LHR - SIN
1 stop15h 50mLufthansa
Sat 27/923:40SIN - LHR
1 stop16h 00mLufthansa
Deal found 11/7£484
Fri 5/922:05LHR - SIN
1 stop30h 50mShenzhen Airlines
Sat 13/903:30SIN - LHR
1 stop23h 30mShenzhen Airlines
Deal found 10/7£489
Thu 20/1121:30LHR - BKK
2 stops37h 25mChina Southern
Thu 18/1218:55BKK - LHR
1 stop30h 20mChina Southern
Deal found 10/7£500
Tue 9/921:05LHR - BKK
1 stop34h 30mAir India
Fri 26/914:45BKK - LHR
1 stop34h 45mAir India
Deal found 10/7£501
Mon 17/1121:00LHR - BKK
2 stops45h 20mChina Eastern
Wed 3/1201:55BKK - LHR
1 stop22h 35mChina Eastern
Deal found 12/7£502
Sat 23/822:05LHR - BKK
1 stop22h 10mMultiple Airlines
Tue 16/901:30BKK - LHR
1 stop24h 00mMultiple Airlines
Deal found 11/7£503
Sat 29/1121:35LHR - BKK
1 stop31h 55mAir China
Sat 20/1217:55BKK - LHR
2 stops30h 55mAir China
Deal found 11/7£507

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 12 July 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

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Fri 5/9

12:30-18:30

1 stop23h 00m

Singapore Changi

Sat 20/9

23:00-07:30

1 stop39h 30m

£478

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Wed 1/10

22:05-12:20

1 stop31h 15m

Singapore Changi

Tue 28/10

20:25-06:35

1 stop18h 10m

£480

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sat 4/10

21:00-12:15

2 stops32h 15m

Singapore Changi

Mon 27/10

03:55-18:15

1 stop22h 20m

£481

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 6/10

17:50-16:40

1 stop15h 50m

Singapore Changi

Sun 26/10

00:05-11:15

1 stop19h 10m

£484

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 2/9

17:50-16:40

1 stop15h 50m

Singapore Changi

Sat 27/9

23:40-08:40

1 stop16h 00m

£484

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Fri 5/9

22:05-11:55

1 stop30h 50m

Singapore Changi

Sat 13/9

03:30-20:00

1 stop23h 30m

£489

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sun 28/9

08:55-17:05

2 stops25h 10m

Singapore Changi

Wed 8/10

23:20-16:25

1 stop24h 05m

£495

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 20/11

21:30-17:55

2 stops37h 25m

Bangkok Suvarnabhumi

Thu 18/12

18:55-18:15

1 stop30h 20m

£500

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 9/9

21:05-13:35

1 stop34h 30m

Bangkok Suvarnabhumi

Fri 26/9

14:45-19:30

1 stop34h 45m

£501

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 17/11

21:00-14:55

3 stops34h 55m

Bangkok Suvarnabhumi

Wed 3/12

01:55-17:30

1 stop22h 35m

£502

Flights are sorted by cheapest return flights first.

Deals found on 9/7

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 £718). 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 12 July 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 12 July 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 12 July 2025.
Check out reviews from past customers who have flown with Hainan Airlines, Singapore Airlines, andAustrian Airlines 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.
Hainan Airlines
8.2
Very Good
41 reviews
Check prices

Overall

8.2

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

Entertainment

7.6

Reviews

1 / 2
10.0
Excellent

Anonymous,Mar 2025

CAN - PEK

Excellent services. The staff were amazing. Although if there was something that I could suggest to improve the services I’d say that snacks and drinks should be offered in between meals. Other than that then it was a lovely flight.
Hainan Airlines
8.2
Very Good
41 reviews
Hainan Airlines
8.2
Very Good
41 reviews
Check prices

Overall

8.2

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

Entertainment

7.6

Reviews

1 / 2
10.0
Excellent

Anonymous,Mar 2025

CAN - PEK

Excellent services. The staff were amazing. Although if there was something that I could suggest to improve the services I’d say that snacks and drinks should be offered in between meals. Other than that then it was a lovely flight.
Singapore Airlines
8.1
Very Good
1,324 reviews
Hainan Airlines
8.2
Very Good
41 reviews
Check prices

Overall

8.2

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

Entertainment

7.6

Reviews

1 / 2
10.0
Excellent

Anonymous,Mar 2025

CAN - PEK

Excellent services. The staff were amazing. Although if there was something that I could suggest to improve the services I’d say that snacks and drinks should be offered in between meals. Other than that then it was a lovely flight.
Austrian Airlines
7.6
Good
811 reviews
Hainan Airlines
8.2
Very Good
41 reviews
Check prices

Overall

8.2

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

Entertainment

7.6

Reviews

1 / 2
10.0
Excellent

Anonymous,Mar 2025

CAN - PEK

Excellent services. The staff were amazing. Although if there was something that I could suggest to improve the services I’d say that snacks and drinks should be offered in between meals. Other than that then it was a lovely flight.
China Southern
7.6
Good
103 reviews
Hainan Airlines
8.2
Very Good
41 reviews
Check prices

Overall

8.2

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

Entertainment

7.6

Reviews

1 / 2
10.0
Excellent

Anonymous,Mar 2025

CAN - PEK

Excellent services. The staff were amazing. Although if there was something that I could suggest to improve the services I’d say that snacks and drinks should be offered in between meals. Other than that then it was a lovely flight.

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.

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

    The cheapest airline one-way is Hainan Airlines, with whom users have recently found tickets for as low as £296. 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 Thai Airways (71%), EVA Air (70%) and Air Canada (67%).

  • 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 £2,578, our data indicates the cheapest price to be £366. The most popular route (London Heathrow - Bangkok Suvarnabhumi), is priced around £336.

  • 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 £718). 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
Gatwick to Suvarnabhumi flights
Heathrow to Haneda flights
London City to Suvarnabhumi flights
Stansted to Suvarnabhumi flights
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Heathrow to Narita flights
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Heathrow to Mumbai flights
Heathrow to Manila flights
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Heathrow to Singapore flights
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Heathrow to Incheon Intl flights
Stansted to Narita flights
Gatwick to Singapore flights
Gatwick to Manila flights
Gatwick to Kuala Lumpur Intl flights
London City to Haneda flights
London City to Narita flights
Heathrow to Ho Chi Minh City flights
Stansted to Kuala Lumpur Intl flights
Stansted to Manila flights
London City to Kuala Lumpur Intl flights
Heathrow to Denpasar flights
Heathrow to Hyderabad flights
Heathrow to Bangalore flights
London City to Manila flights
Heathrow to Taiwan Taoyuan Intl flights
Heathrow to Phuket City flights
Gatwick to Mumbai flights
Stansted to New Delhi flights
Gatwick to New Delhi flights
Luton to Suvarnabhumi flights
Gatwick to Denpasar flights
Heathrow to Lahore flights
Stansted to Mumbai flights
Heathrow to Gimpo Intl flights
Gatwick to Colombo flights
London City to Denpasar flights
Stansted to Denpasar flights
Heathrow to Hongqiao Intl flights
Stansted to Colombo flights
Heathrow to Don Mueang Intl flights
Heathrow to Islamabad flights
Gatwick to Hong Kong flights
Gatwick to Phuket City flights
Heathrow to Kathmandu 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 12 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Hainan AirlinesCheapest£375Average£436FlexibilityNo cancel feeOn-time61%
Search Hainan Airlines flights
KLMCheapest£413Average£848FlexibilityNo cancel feeOn-time75%
Search KLM flights
Royal Brunei AirlinesCheapest£424Average£579FlexibilityNo cancel feeOn-time84%
Search Royal Brunei Airlines flights
FinnairCheapest£456Average£821FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£481Average£764FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
SWISSCheapest£481Average£709FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Norse Atlantic UKCheapest£482Average£575FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
Austrian AirlinesCheapest£524Average£833FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Royal JordanianCheapest£536Average£707FlexibilityNo cancel feeOn-time61%
Search Royal Jordanian flights
Virgin AtlanticCheapest£539Average£653FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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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