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Cheap flights from London Heathrow Airport to Southeast Asia from $559

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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
18 Jun — 25 Jun1
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 19 May 2026.

Tue 2/621:20
LHR
-
BKK
1 stop38h 45m
China Eastern
Tue 16/611:50
BKK
-
LHR
1 stop36h 50m
China Eastern
Deal found 17/5$854
Tue 2/621:20
LHR
-
BKK
1 stop33h 10m
China Eastern
Thu 11/602:10
BKK
-
LHR
1 stop22h 30m
China Eastern
Deal found 16/5$855
Sun 14/622:10
LHR
-
BKK
1 stop19h 55m
SAUDIA
Sat 27/615:25
BKK
-
LHR
1 stop22h 05m
SAUDIA
Deal found 15/5$857
Tue 2/621:20
LHR
-
BKK
1 stop21h 20m
China Eastern
Mon 15/607:50
BKK
-
LHR
2 stops40h 50m
China Eastern
Deal found 17/5$864
Sun 14/622:10
LHR
-
BKK
1 stop19h 55m
SAUDIA
Sun 28/615:25
BKK
-
LHR
1 stop22h 05m
SAUDIA
Deal found 15/5$867
Thu 11/621:20
LHR
-
BKK
1 stop18h 35m
China Eastern
Mon 15/620:50
BKK
-
LHR
2 stops27h 50m
China Eastern
Deal found 19/5$872
Sat 28/1121:10
LHR
-
BKK
1 stop22h 05m
Shenzhen Airlines
Sat 12/1212:10
BKK
-
LHR
1 stop38h 00m
Shenzhen Airlines
Deal found 18/5$875
Mon 2/1121:10
LHR
-
BKK
1 stop31h 00m
Shenzhen Airlines
Thu 12/1119:30
BKK
-
LHR
1 stop30h 40m
Shenzhen Airlines
Deal found 16/5$876
Fri 13/1121:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Sat 28/1112:10
BKK
-
LHR
1 stop38h 00m
Shenzhen Airlines
Deal found 19/5$878
Mon 16/1121:10
LHR
-
BKK
1 stop22h 05m
Shenzhen Airlines
Thu 26/1103:15
BKK
-
LHR
1 stop22h 55m
Shenzhen Airlines
Deal found 19/5$879
Wed 11/1121:10
LHR
-
BKK
1 stop31h 00m
Shenzhen Airlines
Sat 21/1119:30
BKK
-
LHR
1 stop30h 40m
Shenzhen Airlines
Deal found 18/5$881
Thu 26/1120:25
LHR
-
BKK
1 stop20h 45m
Air China
Thu 3/1219:30
BKK
-
LHR
1 stop27h 25m
Air China
Deal found 19/5$883

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 19 May 2026.

Round-trip from

$854

One-way from

$559

Popular in

December

Cheapest in

September

Average price

$1,027
China Eastern
  • China Eastern
  • 2/6-16/6
  • 2 total stops
  • 43h 50m total
  • London to Southeast Asia
Search Deals
9/6
  • 9/6
  • 2 total stops
  • 30h 25m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($96 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($49 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 19 May 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

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 1/6

22:05-02:05

1 stop21h 00m

Kuala Lumpur Intl

Tue 30/6

12:50-20:00

1 stop38h 10m

$996

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 21/9

21:20-14:40

3 stops58h 20m

Kuala Lumpur Intl

Wed 14/10

04:05-18:40

2 stops45h 35m

$1,022

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 3/11

21:00-12:20

1 stop32h 20m

Bangkok Suvarnabhumi

Mon 30/11

01:55-17:30

1 stop22h 35m

$1,024

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 27/10

21:00-20:10

2 stops40h 10m

Bangkok Suvarnabhumi

Thu 12/11

13:35-17:30

1 stop34h 55m

$1,031

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Thu 25/6

14:45-12:05

1 stop15h 20m

Phuket City

Tue 14/7

02:25-12:45

1 stop16h 20m

$1,052

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 29/6

21:45-12:05

1 stop32h 20m

Phuket City

Fri 10/7

15:45-12:45

1 stop27h 00m

$1,052

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Tue 10/11

21:00-19:35

2 stops63h 35m

Phuket City

Tue 17/11

20:50-17:30

2 stops51h 40m

$1,052

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Fri 3/7

14:45-07:35

1 stop34h 50m

Phuket City

Thu 9/7

02:25-15:05

1 stop18h 40m

$1,067

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Sat 7/11

09:30-12:50

1 stop19h 20m

Singapore Changi

Mon 16/11

20:00-14:45

1 stop26h 45m

$1,114

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 26/10

20:55-23:50

1 stop19h 55m

Phuket City

Thu 12/11

02:40-14:30

1 stop18h 50m

$1,122

Flights are sorted by cheapest return flights first.

Deals found on 19/5

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 $1,170). Flying from London Heathrow Airport to Southeast Asia in December is currently the most expensive (average of $1,925). 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 19 May 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 19 May 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 19 May 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
2,958 reviews
Check prices

Overall

5.5

Entertainment

4.6

Boarding

6.3

Food

5.8

Comfort

5.5

Crew

6.7

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
2,958 reviews
Air India
5.5
Fair
2,958 reviews
Check prices

Overall

5.5

Entertainment

4.6

Boarding

6.3

Food

5.8

Comfort

5.5

Crew

6.7

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, Etihad Airways, and Gulf Air can get you from London Heathrow Airport to Southeast Asia in just under 15h 05m. Your travel time can differ by up to 43h 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 - Bangkok Suvarnabhumi. You may also consider London Heathrow - Kuala Lumpur Intl or London Heathrow - Singapore Changi.

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

    Consider TAP AIR PORTUGAL (87%), Thai Airways (78%) or Air Canada (75%) 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 $1,227. While the most popular route (London Heathrow - Bangkok Suvarnabhumi) can be booked for $1,015 on average, our data indicates $1,713 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 $1,170). Flying from London Heathrow Airport to Southeast Asia in December is currently the most expensive (average of $1,925). 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 Suvarnabhumi flights
Heathrow to Singapore flights
Gatwick 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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