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Cheap flights from London Heathrow Airport to Southeast Asia from £297

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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
20 Jul — 27 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 15 July 2025.

Round-trip from

£483

One-way from

£297

Popular in

December

Cheapest in

May

Average price

£835
Air China
  • Air China
  • 2/11-27/11
  • 2 total stops
  • 46h 10m total
  • London to Southeast Asia
Search Deals
Hainan Airlines
  • Hainan Airlines
  • 1/12
  • 2 total stops
  • 38h 05m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£42 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 15 July 2025.

Sun 2/1117:40LHR - SIN
1 stop20h 15mAir China
Thu 27/1123:55SIN - LHR
1 stop25h 55mAir China
Deal found 14/7£483
Wed 22/1017:10LHR - SIN
1 stop16h 55mSWISS
Sun 26/1000:05SIN - LHR
1 stop19h 10mSWISS
Deal found 14/7£484
Sun 19/1006:30LHR - SIN
1 stop26h 55mLufthansa
Tue 28/1023:55SIN - LHR
1 stop16h 50mLufthansa
Deal found 14/7£484
Thu 7/809:45LHR - SIN
1 stop29h 00mAir India
Thu 14/823:00SIN - LHR
1 stop19h 30mAir India
Deal found 12/7£486
Mon 3/1121:00LHR - SIN
2 stops30h 10mMultiple Airlines
Sat 15/1121:20SIN - LHR
1 stop26h 05mMultiple Airlines
Deal found 12/7£487
Wed 1/1022:05LHR - SIN
1 stop31h 15mGulf Air
Tue 28/1020:25SIN - LHR
1 stop26h 20mGulf Air
Deal found 13/7£489
Mon 1/922:05LHR - SIN
1 stop21h 25mShenzhen Airlines
Fri 5/918:10SIN - LHR
1 stop32h 40mShenzhen Airlines
Deal found 13/7£492
Mon 15/922:00LHR - SIN
2 stops30h 00mHainan Airlines
Sun 21/912:05SIN - LHR
2 stops38h 25mHainan Airlines
Deal found 13/7£496
Sun 7/922:10LHR - SIN
1 stop18h 20mChina Southern
Wed 5/1103:55SIN - LHR
2 stops46h 00mChina Southern
Deal found 13/7£504
Sat 20/912:30LHR - BKK
1 stop19h 05mAir India
Sat 11/1020:50BKK - LHR
1 stop19h 25mAir India
Deal found 13/7£505
Wed 5/1122:00LHR - BKK
1 stop31h 55mChina Southern
Sat 15/1102:10BKK - LHR
1 stop23h 05mChina Southern
Deal found 14/7£506
Tue 18/1121:00LHR - BKK
3 stops34h 55mChina Eastern
Wed 3/1201:55BKK - LHR
1 stop22h 35mChina Eastern
Deal found 13/7£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 15 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

Sun 2/11

17:40-21:55

1 stop20h 15m

Singapore Changi

Thu 27/11

23:55-17:50

1 stop25h 55m

£483

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Wed 22/10

17:10-17:05

1 stop16h 55m

Singapore Changi

Sun 26/10

00:05-11:15

1 stop19h 10m

£484

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sun 19/10

07:30-16:25

1 stop25h 55m

Singapore Changi

Mon 27/10

23:55-10:45

1 stop18h 50m

£484

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 7/8

09:45-21:45

1 stop29h 00m

Singapore Changi

Thu 14/8

23:00-11:30

1 stop19h 30m

£486

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 3/11

21:00-11:10

2 stops30h 10m

Singapore Changi

Sat 15/11

21:20-15:25

1 stop26h 05m

£487

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Wed 1/10

22:05-12:20

1 stop31h 15m

Singapore Changi

Tue 28/10

20:25-14:45

1 stop26h 20m

£489

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 1/9

22:05-02:30

1 stop21h 25m

Singapore Changi

Fri 5/9

18:10-19:50

1 stop32h 40m

£492

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 15/9

22:00-11:00

2 stops30h 00m

Singapore Changi

Sun 21/9

12:05-19:30

2 stops38h 25m

£496

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sun 7/9

22:10-23:30

1 stop18h 20m

Singapore Changi

Wed 5/11

03:55-17:55

2 stops46h 00m

£504

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 20/9

12:30-13:35

1 stop19h 05m

Bangkok Suvarnabhumi

Sat 11/10

20:50-10:15

1 stop19h 25m

£505

Flights are sorted by cheapest return flights first.

Deals found on 14/7

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 15 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 15 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 15 July 2025.
Check out reviews from past customers who have flown with Hainan Airlines, Emirates, andSingapore 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

Entertainment

7.6

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

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

Entertainment

7.6

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

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.
Emirates
8.1
Very Good
3,286 reviews
Hainan Airlines
8.2
Very Good
41 reviews
Check prices

Overall

8.2

Entertainment

7.6

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

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
1,326 reviews
Hainan Airlines
8.2
Very Good
41 reviews
Check prices

Overall

8.2

Entertainment

7.6

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

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
814 reviews
Hainan Airlines
8.2
Very Good
41 reviews
Check prices

Overall

8.2

Entertainment

7.6

Boarding

8.6

Comfort

8.1

Crew

8.9

Food

8.6

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 £297. However, be on the lookout for offers from Shenzhen Airlines and China Southern, 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 £2,687, our data indicates the cheapest price to be £393. The most popular route (London Heathrow - Bangkok Suvarnabhumi), is priced around £335.

  • 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
Heathrow to Kuala Lumpur Intl flights
Heathrow to Narita flights
Heathrow to Manila flights
Heathrow to Hong Kong flights
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Heathrow to Mumbai flights
Heathrow to Colombo flights
Gatwick to Narita flights
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Heathrow to Singapore flights
Stansted to Narita flights
Heathrow to Incheon Intl flights
Gatwick to Manila flights
London City to Haneda flights
Heathrow to Ho Chi Minh City flights
Stansted to Manila flights
Heathrow to Denpasar flights
London City to Narita flights
Gatwick to Kuala Lumpur Intl flights
Gatwick to Singapore flights
Stansted to Kuala Lumpur Intl flights
London City to Kuala Lumpur Intl flights
London City to Manila flights
Heathrow to Bangalore flights
Heathrow to Lahore flights
Heathrow to Phuket City flights
Heathrow to Taiwan Taoyuan Intl flights
Gatwick to Denpasar flights
London City to Denpasar flights
Stansted to Denpasar flights
Luton to Suvarnabhumi flights
Heathrow to Hyderabad flights
Heathrow to Gimpo Intl flights
Gatwick to Ho Chi Minh City flights
Gatwick to Hong Kong flights
Stansted to New Delhi flights
Gatwick to Colombo flights
London City to Hong Kong flights
Heathrow to Don Mueang Intl flights
Stansted to Hong Kong flights
Stansted to Mumbai flights
Gatwick to New Delhi flights
Stansted to Colombo flights
Heathrow to Ahmedabad flights
Gatwick to Mumbai 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 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Hainan AirlinesCheapest£376Average£450FlexibilityNo cancel feeOn-time61%
Search Hainan Airlines flights
KLMCheapest£415Average£836FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air FranceCheapest£416Average£641FlexibilityNo cancel feeOn-time77%
Search Air France flights
Royal Brunei AirlinesCheapest£426Average£576FlexibilityNo cancel feeOn-time84%
Search Royal Brunei Airlines flights
FinnairCheapest£459Average£831FlexibilityNo cancel feeOn-time76%
Search Finnair flights
SWISSCheapest£479Average£713FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Norse Atlantic UKCheapest£485Average£571FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
LufthansaCheapest£485Average£768FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£526Average£838FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Royal JordanianCheapest£540Average£710FlexibilityNo 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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