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Cheap flights from London Heathrow Airport to Southeast Asia from $556

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 29/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
5 May — 12 May1
1 adult
1 adult, Economy, 0 bags

Cheap 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 5 April 2026.

Mon 8/622:05
LHR
-
BKK
1 stop22h 10m
Shenzhen Airlines
Thu 25/603:15
BKK
-
LHR
1 stop22h 45m
Shenzhen Airlines
Deal found 5/4$837
Sun 3/522:05
LHR
-
BKK
1 stop31h 05m
Shenzhen Airlines
Thu 4/603:15
BKK
-
LHR
1 stop22h 45m
Shenzhen Airlines
Deal found 1/4$839
Mon 11/522:05
LHR
-
BKK
1 stop22h 10m
Shenzhen Airlines
Tue 2/603:15
BKK
-
LHR
1 stop22h 45m
Shenzhen Airlines
Deal found 31/3$840
Sun 7/622:05
LHR
-
BKK
1 stop38h 10m
Shenzhen Airlines
Thu 25/612:10
BKK
-
LHR
1 stop37h 50m
Shenzhen Airlines
Deal found 2/4$843
Sun 10/522:05
LHR
-
BKK
1 stop22h 10m
Shenzhen Airlines
Thu 29/1012:10
BKK
-
LHR
1 stop38h 00m
Shenzhen Airlines
Deal found 1/4$856
Sun 17/522:05
LHR
-
BKK
1 stop22h 10m
Shenzhen Airlines
Fri 19/603:15
BKK
-
LHR
1 stop22h 35m
Shenzhen Airlines
Deal found 31/3$858
Sun 17/522:05
LHR
-
BKK
1 stop38h 10m
Shenzhen Airlines
Sat 6/619:15
BKK
-
LHR
1 stop30h 45m
Shenzhen Airlines
Deal found 31/3$859
Mon 8/622:05
LHR
-
BKK
1 stop38h 10m
Shenzhen Airlines
Thu 25/612:10
BKK
-
LHR
1 stop37h 50m
Shenzhen Airlines
Deal found 1/4$876
Sun 1/1121:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Tue 17/1112:10
BKK
-
LHR
1 stop38h 00m
Shenzhen Airlines
Deal found 31/3$895
Mon 2/1121:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Sun 15/1112:10
BKK
-
LHR
1 stop38h 00m
Shenzhen Airlines
Deal found 3/4$897
Wed 11/1121:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Sat 21/1112:10
BKK
-
LHR
1 stop38h 00m
Shenzhen Airlines
Deal found 1/4$898
Wed 2/921:20
LHR
-
BKK
1 stop21h 20m
China Eastern
Wed 7/1016:50
BKK
-
LHR
1 stop31h 50m
China Eastern
Deal found 4/4$900

Find 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 5 April 2026.

Round-trip from

$837

One-way from

$556

Popular in

July

Cheapest in

May

Average price

$1,202
Shenzhen Airlines
  • Shenzhen Airlines
  • 8/6-25/6
  • 2 total stops
  • 44h 55m total
  • London to Southeast Asia
Search Deals
Etihad Airways
  • Etihad Airways
  • 29/4
  • 1 total stop
  • 15h 45m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($196 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($53 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 5 April 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Tue 12/5

21:45-18:20

1 stop14h 35m

Phuket City

Wed 20/5

09:25-18:45

1 stop15h 20m

$1,049

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Thu 16/4

20:45-07:50

1 stop29h 05m

Phuket City

Thu 30/4

09:25-19:20

1 stop15h 55m

$1,049

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Sat 30/5

14:45-12:15

1 stop15h 30m

Phuket City

Tue 9/6

02:25-12:45

1 stop16h 20m

$1,075

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 17/4

14:50-19:00

1 stop22h 10m

Bangkok Suvarnabhumi

Sat 9/5

03:15-15:05

1 stop17h 50m

$1,081

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 29/4

21:10-18:10

1 stop15h 00m

Bangkok Suvarnabhumi

Thu 7/5

03:15-12:45

1 stop15h 30m

$1,082

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Fri 15/5

21:45-23:55

1 stop20h 10m

Phuket City

Fri 29/5

09:25-15:05

1 stop35h 40m

$1,088

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Sun 21/6

09:30-19:45

1 stop27h 15m

Kuala Lumpur Intl

Wed 19/8

09:50-07:00

1 stop28h 10m

$1,102

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Tue 28/4

09:05-14:05

1 stop23h 00m

Phuket City

Tue 5/5

20:45-14:00

1 stop23h 15m

$1,165

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 9/6

20:50-00:10

2 stops20h 20m

Singapore Changi

Tue 16/6

06:20-19:10

2 stops19h 50m

$1,166

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 21/4

20:50-00:10

2 stops20h 20m

Singapore Changi

Thu 23/4

21:15-19:10

2 stops28h 55m

$1,224

Flights are sorted by cheapest return flights first.

Deals found on 3/4

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $721). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,029). 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 5 April 2026.

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 5 April 2026.

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).

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 Oman Air can get you from London Heathrow Airport to Southeast Asia in just under 16h 35m. Your travel time can differ by up to 14h 30m. Airlines will cover a distance of 9896 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 Singapore Airlines, which is currently one of the cheapest options available, starting at $629. Qatar Airways flights start at $785 while deals on Thai Airways start at $1,043 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 - Kuala Lumpur Intl. You may also consider London Heathrow - Singapore Changi or London Heathrow - Phuket City.

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

    Consider Thai Airways (75%), Air Canada (70%) or EVA Air (70%) 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 $1,113. While the most popular route (London Heathrow - Kuala Lumpur Intl) can be booked for $1,047 on average, our data indicates $2,030 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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Southeast Asia (average of $721). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,029). 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

Browse thousands of different options on Cheapflights for your next trip

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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 Singapore flights
Gatwick to Suvarnabhumi flights
Heathrow to Suvarnabhumi 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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