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Cheap flights from London Heathrow Airport to Southeast Asia from $570

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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
5 Jul — 12 Jul1
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 June 2026.

Sat 14/1121:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Tue 17/1103:15
BKK
-
LHR
1 stop22h 55m
Shenzhen Airlines
Deal found 1/6$879
Wed 11/1121:10
LHR
-
BKK
1 stop22h 05m
Shenzhen Airlines
Sun 22/1119:30
BKK
-
LHR
1 stop30h 40m
Shenzhen Airlines
Deal found 4/6$880
Sun 8/1121:10
LHR
-
BKK
1 stop22h 05m
Shenzhen Airlines
Tue 24/1112:10
BKK
-
LHR
1 stop38h 00m
Shenzhen Airlines
Deal found 2/6$882
Wed 1/722:00
LHR
-
BKK
1 stop30h 00m
Hainan Airlines
Sun 12/719:20
BKK
-
LHR
2 stops30h 10m
Hainan Airlines
Deal found 2/6$915
Fri 20/1121:00
LHR
-
BKK
1 stop32h 20m
China Eastern
Sun 22/1115:55
BKK
-
LHR
2 stops32h 35m
China Eastern
Deal found 2/6$981
Wed 1/722:00
LHR
-
KUL
1 stop38h 55m
Multiple Airlines
Mon 13/709:50
KUL
-
LHR
1 stop15h 55m
Multiple Airlines
Deal found 1/6$984
Thu 12/1121:00
LHR
-
BKK
2 stops61h 15m
China Eastern
Sun 15/1121:05
BKK
-
LHR
3 stops51h 25m
China Eastern
Deal found 4/6$989
Tue 8/922:40
LHR
-
BKK
1 stop19h 30m
Multiple Airlines
Tue 15/920:15
BKK
-
LHR
1 stop16h 40m
Multiple Airlines
Deal found 2/6$995
Wed 21/1022:05
LHR
-
KUL
1 stop37h 40m
Shenzhen Airlines
Fri 6/1104:20
KUL
-
LHR
1 stop22h 50m
Shenzhen Airlines
Deal found 2/6$996
Wed 4/1121:10
LHR
-
KUL
1 stop22h 10m
Shenzhen Airlines
Thu 12/1104:20
KUL
-
LHR
1 stop22h 50m
Shenzhen Airlines
Deal found 1/6$998
Thu 17/921:20
LHR
-
HKT
1 stop18h 40m
China Eastern
Fri 16/1000:05
HKT
-
LHR
1 stop24h 35m
China Eastern
Deal found 3/6$1,002
Sun 1/1121:10
LHR
-
BKK
1 stop22h 05m
Shenzhen Airlines
Thu 26/1103:15
BKK
-
LHR
1 stop22h 55m
Shenzhen Airlines
Deal found 4/6$1,002

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 June 2026.

Round-trip from

$879

One-way from

$570

Popular in

December

Cheapest in

September

Average price

$1,036
Shenzhen Airlines
  • Shenzhen Airlines
  • 14/11-17/11
  • 2 total stops
  • 61h 15m total
  • London to Southeast Asia
Search Deals
China Eastern
  • China Eastern
  • 1/9
  • 1 total stop
  • 21h 20m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($100 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($50 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 June 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

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Tue 3/11

21:00-05:25

1 stop24h 25m

Singapore Changi

Sun 6/12

23:00-17:30

1 stop26h 30m

$1,048

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Tue 30/6

08:25-18:50

1 stop28h 25m

Phuket City

Tue 14/7

09:20-08:00

1 stop28h 40m

$1,134

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Fri 2/10

21:45-06:40

1 stop26h 55m

Phuket City

Mon 19/10

15:20-12:45

1 stop27h 25m

$1,166

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Fri 13/11

21:10-18:05

Nonstop12h 55m

Kuala Lumpur Intl

Sun 29/11

23:15-05:20

Nonstop14h 05m

$1,218

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 16/11

21:00-14:45

3 stops57h 45m

Kuala Lumpur Intl

Mon 30/11

15:45-17:30

2 stops33h 45m

$1,219

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Tue 22/9

21:20-23:30

2 stops43h 10m

Denpasar Bali Ngurah Rai

Tue 13/10

00:55-18:40

1 stop24h 45m

$1,233

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 12/11

09:30-09:20

1 stop16h 50m

Bangkok Suvarnabhumi

Fri 19/2

19:15-14:45

1 stop26h 30m

$1,354

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 13/11

10:45-10:05

1 stop16h 20m

Bangkok Suvarnabhumi

Sat 20/2

03:00-13:45

1 stop17h 45m

$1,362

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Mon 9/11

18:40-15:55

Nonstop13h 15m

Singapore Changi

Thu 10/12

23:15-05:55

Nonstop14h 40m

$1,403

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Fri 28/8

08:25-13:20

2 stops22h 55m

Phuket City

Sat 12/9

20:20-06:30

1 stop16h 10m

$1,431

Flights are sorted by cheapest return flights first.

Deals found on 4/6

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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 $1,176). Flying from London Heathrow Airport to Southeast Asia in December is currently the most expensive (average of $1,947). 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 June 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 June 2026.

The most flights from LHR to zzYJX are scheduled on a Monday (9 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (9 on average).

How far ahead should I book a flight from London Heathrow Airport to Southeast Asia?

Booking 81 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Southeast Asia. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 5 June 2026.
See what other customers who have flown with Air India 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.
Air India
5.5
Fair
2,960 reviews
Check prices

Crew

6.7

Overall

5.5

Entertainment

4.6

Comfort

5.5

Food

5.8

Boarding

6.3

Reviews

1 / 20
6.0
Good

Anonymous,May 2024

BHX - DEL

The entertainment was not working for the entire flight duration and it’s a shame for such a long flight Horus.
Air India
5.5
Fair
2,960 reviews
Air India
5.5
Fair
2,960 reviews
Check prices

Crew

6.7

Overall

5.5

Entertainment

4.6

Comfort

5.5

Food

5.8

Boarding

6.3

Reviews

1 / 20
6.0
Good

Anonymous,May 2024

BHX - DEL

The entertainment was not working for the entire flight duration and it’s a shame for such a long flight Horus.

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?

    China Eastern, SAUDIA, and Etihad Airways can get you from London Heathrow Airport to Southeast Asia in just under 20h 40m. Your travel time can differ by up to 6h 15m. Airlines will cover a distance of 9571 km. This flight may include one or multiple stops.

  • 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 - Denpasar Bali Ngurah Rai or London Heathrow - Bangkok Suvarnabhumi.

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

    Consider Thai Airways (92%), EVA Air (91%) or Air Canada (91%) 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 $1,279. While the most popular route (London Heathrow - Kuala Lumpur Intl) can be booked for $1,090 on average, our data indicates $1,622 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 $1,176). Flying from London Heathrow Airport to Southeast Asia in December is currently the most expensive (average of $1,947). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Heathrow to Southeast Asia

See prices for flight routes from nearby airports that may be better suited for you.
Gatwick to Suvarnabhumi flights
Heathrow to Singapore flights
Heathrow to Suvarnabhumi 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?

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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