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Cheap flights from London Heathrow Airport to Southeast Asia from $538

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
12 Oct — 19 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 12 September 2025.

Round-trip from

$903

One-way from

$538

Popular in

December

Cheapest in

May

Average price

$1,108
Austrian Airlines
  • Austrian Airlines
  • 25/2-13/5
  • 2 total stops
  • 29h 50m total
  • London to Southeast Asia
Search Deals
Shenzhen Airlines
  • Shenzhen Airlines
  • 21/9
  • 1 total stop
  • 38h 10m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($176 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($67 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 12 September 2025.

Mon 3/1121:10LHR - BKK
1 stop22h 05mShenzhen Airlines
Thu 20/1103:15BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 10/9$909
Fri 7/1121:10LHR - BKK
1 stop38h 20mShenzhen Airlines
Thu 4/1212:10BKK - LHR
1 stop38h 00mShenzhen Airlines
Deal found 11/9$911
Wed 29/1021:10LHR - BKK
1 stop22h 05mShenzhen Airlines
Tue 4/1103:15BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 11/9$914
Mon 24/1120:30LHR - BKK
1 stop34h 05mAir India
Sat 29/1120:50BKK - LHR
1 stop21h 15mAir India
Deal found 11/9$920
Mon 3/1116:40LHR - SIN
1 stop16h 45mMultiple Airlines
Sun 23/1100:05SIN - LHR
1 stop16h 00mMultiple Airlines
Deal found 11/9$926
Thu 6/1117:50LHR - SIN
1 stop15h 35mMultiple Airlines
Mon 24/1100:05SIN - LHR
1 stop16h 00mMultiple Airlines
Deal found 10/9$927
Fri 14/1117:50LHR - SIN
1 stop15h 35mLufthansa
Wed 3/1223:55SIN - LHR
1 stop17h 50mLufthansa
Deal found 10/9$929
Sat 25/1021:05LHR - BKK
1 stop34h 30mAir India
Sat 1/1114:45BKK - LHR
1 stop35h 10mAir India
Deal found 10/9$942
Fri 26/922:05LHR - BKK
1 stop22h 10mShenzhen Airlines
Tue 28/1019:30BKK - LHR
1 stop30h 40mShenzhen Airlines
Deal found 11/9$955
Fri 26/922:05LHR - BKK
1 stop22h 10mShenzhen Airlines
Tue 21/1019:30BKK - LHR
1 stop30h 30mShenzhen Airlines
Deal found 12/9$956
Tue 9/1217:50LHR - SIN
1 stop15h 35mLufthansa
Wed 24/1223:45SIN - LHR
1 stop18h 40mLufthansa
Deal found 10/9$958
Fri 7/1121:00LHR - BKK
1 stop18h 25mChina Eastern
Sun 7/1221:05BKK - LHR
2 stops27h 25mChina Eastern
Deal found 10/9$958

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 647,157 searches. Data last updated 12 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

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 3/12

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Sat 13/12

19:30-19:10

1 stop30h 40m

$911

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 3/11

16:40-17:25

1 stop16h 45m

Singapore Changi

Sun 23/11

00:05-08:05

1 stop16h 00m

$926

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 3/11

20:05-18:00

1 stop37h 55m

Singapore Changi

Sun 23/11

00:05-13:40

2 stops21h 35m

$1,012

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 14/10

17:50-16:40

1 stop15h 50m

Singapore Changi

Sun 16/11

00:05-08:05

1 stop16h 00m

$1,040

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Sat 4/10

22:05-03:20

1 stop22h 15m

Kuala Lumpur Intl

Sun 2/11

04:20-19:10

1 stop22h 50m

$1,053

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 28/10

18:40-18:00

1 stop15h 20m

Singapore Changi

Mon 3/11

00:05-13:40

2 stops21h 35m

$1,074

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 7/11

20:55-23:20

1 stop19h 25m

Bangkok Suvarnabhumi

Mon 10/11

20:50-14:30

1 stop24h 40m

$1,080

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Tue 7/10

14:45-23:35

1 stop26h 50m

Phuket City

Mon 1/12

00:25-14:30

1 stop21h 05m

$1,107

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sun 15/2

13:55-23:20

1 stop26h 25m

Bangkok Suvarnabhumi

Tue 3/3

02:55-12:05

1 stop16h 10m

$1,111

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 22/9

14:45-18:25

1 stop21h 40m

Phuket City

Wed 15/10

00:55-12:45

1 stop17h 50m

$1,113

Flights are sorted by cheapest return flights first.

Deals found on 11/9

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, February is the cheapest month in which you can book a flight from London Heathrow Airport to Southeast Asia (average of $489). Flying from London Heathrow Airport to Southeast Asia in December is currently the most expensive (average of $911). 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 September 2025.

When flying from London Heathrow Airport to Southeast Asia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 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 12 September 2025.
See what other customers who have flown with Singapore Airlines, Thai Airways, andEtihad Airways from London Heathrow Airport to Southeast Asia have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very Good
1,365 reviews
Check prices

Crew

8.6

Food

7.7

Overall

8.1

Boarding

8.2

Comfort

8.0

Entertainment

8.0

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

Crew

8.6

Food

7.7

Overall

8.1

Boarding

8.2

Comfort

8.0

Entertainment

8.0

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.
Thai Airways
7.8
Good
350 reviews
Singapore Airlines
8.1
Very Good
1,365 reviews
Check prices

Crew

8.6

Food

7.7

Overall

8.1

Boarding

8.2

Comfort

8.0

Entertainment

8.0

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

Crew

8.6

Food

7.7

Overall

8.1

Boarding

8.2

Comfort

8.0

Entertainment

8.0

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, SWISS, and Etihad Airways can get you from London Heathrow Airport to Southeast Asia in just under 19h 25m. Your travel time can differ by up to 18h 30m. Airlines will cover a distance of 9571 km. This flight may include one or multiple stops.

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

    To fly one-way, consider booking your trip with Shenzhen Airlines, which is currently one of the cheapest options available, starting at $538. Austrian Airlines flights start at $624 while deals on Air India start at $636 one-way.

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

    The most popular route from London Heathrow Airport to Southeast Asia is London Heathrow - Bangkok Suvarnabhumi. You may also consider London Heathrow - Denpasar Bali Ngurah Rai or London Heathrow - Kuala Lumpur Intl.

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

    Consider EVA Air (82%), Thai Airways (77%) or Air Canada (69%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Southeast Asia.

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

    Looking at all options, your cheapest flight can be booked for $1,214. While the most popular route (London Heathrow - Bangkok Suvarnabhumi) can be booked for $921 on average, our data indicates $1,440 when flying from London Heathrow Airport to Southeast Asia.

  • 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to Southeast Asia (average of $489). Flying from London Heathrow Airport to Southeast Asia in December is currently the most expensive (average of $911). 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 Singapore flights

Top 2 airlines flying from Heathrow to Southeast Asia

Discover the top 2 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 647,157 searches. Data last updated 12 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Etihad AirwaysCheapest$1,061Average$1,345FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Thai AirwaysCheapest$1,165Average$1,208FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights

Fly with Cheapflights

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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?

Cheapflights helps you find that perfect flight to Southeast Asia from Heathrow by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Heathrow to Southeast Asia flexibly with Cheapflights today.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Southeast Asia from Heathrow today and book when prices fit your budget.

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