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Cheap flights from London Heathrow Airport to Southeast Asia from $542

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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
21 Feb — 28 Feb1
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 22 January 2026.

Tue 10/313:30
LHR
-
BKK
1 stop17h 05m
Air India
Wed 18/320:50
BKK
-
LHR
1 stop21h 15m
Air India
Deal found 21/1$817
Wed 4/321:00
LHR
-
BKK
1 stop18h 25m
China Eastern
Tue 10/300:55
BKK
-
LHR
1 stop23h 35m
China Eastern
Deal found 20/1$825
Mon 26/121:00
LHR
-
HKT
1 stop18h 45m
China Eastern
Sun 8/222:30
HKT
-
LHR
1 stop26h 00m
China Eastern
Deal found 20/1$826
Fri 30/121:00
LHR
-
BKK
1 stop21h 55m
China Eastern
Tue 3/319:55
BKK
-
LHR
1 stop28h 35m
China Eastern
Deal found 21/1$826
Mon 26/121:00
LHR
-
HKT
1 stop18h 45m
China Eastern
Tue 3/200:05
HKT
-
LHR
1 stop24h 25m
China Eastern
Deal found 21/1$828
Thu 29/121:00
LHR
-
BKK
1 stop18h 25m
China Eastern
Sun 8/201:55
BKK
-
LHR
1 stop22h 35m
China Eastern
Deal found 21/1$828
Thu 22/121:00
LHR
-
BKK
1 stop18h 25m
China Eastern
Wed 4/221:05
BKK
-
LHR
2 stops27h 25m
China Eastern
Deal found 19/1$835
Sun 25/121:00
LHR
-
HKT
2 stops38h 35m
China Eastern
Sun 8/222:30
HKT
-
LHR
1 stop26h 00m
China Eastern
Deal found 20/1$837
Mon 26/121:00
LHR
-
BKK
1 stop18h 25m
China Eastern
Tue 3/221:05
BKK
-
LHR
2 stops27h 25m
China Eastern
Deal found 20/1$837
Mon 9/321:00
LHR
-
HKT
1 stop18h 45m
China Eastern
Sun 29/318:55
HKT
-
LHR
3 stops53h 45m
China Eastern
Deal found 21/1$838
Sat 31/121:00
LHR
-
BKK
2 stops21h 15m
China Eastern
Fri 6/305:45
BKK
-
LHR
1 stop18h 45m
China Eastern
Deal found 21/1$838
Tue 3/321:00
LHR
-
HKT
2 stops38h 35m
China Eastern
Tue 10/319:35
HKT
-
LHR
2 stops28h 55m
China Eastern
Deal found 20/1$849

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 22 January 2026.

Round-trip from

$817

One-way from

$542

Popular in

July

Cheapest in

May

Average price

$1,213
Air India
  • Air India
  • 10/3-18/3
  • 2 total stops
  • 38h 20m total
  • London to Southeast Asia
Search Deals
China Eastern
  • China Eastern
  • 8/3
  • 1 total stop
  • 19h 55m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($257 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($55 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 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 22 January 2026.
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

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 16/2

21:00-18:15

2 stops38h 15m

Phuket City

Tue 3/3

00:05-17:30

2 stops24h 25m

$850

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 20/4

21:20-18:00

2 stops38h 40m

Phuket City

Mon 11/5

18:55-18:40

3 stops53h 45m

$871

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 10/4

14:45-23:50

1 stop27h 05m

Bangkok Suvarnabhumi

Tue 16/6

09:45-07:00

1 stop27h 15m

$973

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 15/4

21:45-23:50

1 stop20h 05m

Bangkok Suvarnabhumi

Thu 18/6

09:45-18:45

1 stop15h 00m

$973

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Wed 11/3

21:10-12:10

1 stop31h 00m

Singapore Changi

Sun 15/3

18:30-19:10

1 stop32h 40m

$974

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Wed 15/4

21:20-22:00

1 stop18h 40m

Phuket City

Sat 2/5

23:05-18:40

1 stop25h 35m

$979

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 13/4

21:20-22:45

1 stop19h 25m

Phuket City

Sat 2/5

23:05-18:40

1 stop25h 35m

$979

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Tue 21/4

21:20-22:00

1 stop18h 40m

Phuket City

Mon 11/5

00:20-18:40

1 stop24h 20m

$982

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Thu 30/4

20:35-13:35

1 stop34h 00m

Denpasar Bali Ngurah Rai

Sun 17/5

14:35-19:00

1 stop35h 25m

$997

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Thu 25/6

14:00-08:30

1 stop35h 30m

Denpasar Bali Ngurah Rai

Sun 5/7

14:35-07:30

1 stop23h 55m

$998

Flights are sorted by cheapest return flights first.

Deals found on 20/1

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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Southeast Asia (average of $737). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,085). 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 22 January 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 22 January 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).

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 22 January 2026.
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
1,434 reviews
Check prices

Overall

8.1

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

Boarding

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Singapore Airlines
8.1
Very Good
1,434 reviews
Singapore Airlines
8.1
Very Good
1,434 reviews
Check prices

Overall

8.1

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

Boarding

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Thai Airways
7.8
Good
379 reviews
Singapore Airlines
8.1
Very Good
1,434 reviews
Check prices

Overall

8.1

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

Boarding

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Etihad Airways
7.3
Good
1,374 reviews
Singapore Airlines
8.1
Very Good
1,434 reviews
Check prices

Overall

8.1

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

Boarding

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.
Air India
5.5
Fair
2,977 reviews
Singapore Airlines
8.1
Very Good
1,434 reviews
Check prices

Overall

8.1

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

Boarding

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

BCN - SIN

Staff at Barcelona were fantastic, they helped me change a flight and nothing was any problem. Thank you Dina.

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 Shenzhen Airlines can get you from London Heathrow Airport to Southeast Asia in just under 27h 05m. Your travel time can differ by up to 11h 10m. 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 - Denpasar Bali Ngurah Rai. You may also consider London Heathrow - Bangkok Suvarnabhumi or London Heathrow - Singapore Changi.

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

    Consider EVA Air (80%), Thai Airways (79%) or Air Canada (76%) 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 $1,110. While the most popular route (London Heathrow - Denpasar Bali Ngurah Rai) can be booked for $1,103 on average, our data indicates $1,601 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 $737). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,085). 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

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 22 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Etihad AirwaysCheapest$1,042Average$1,382FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Thai AirwaysCheapest$1,144Average$1,187FlexibilityNo cancel feeOn-time77%
Search Thai Airways 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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