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Cheap flights from London Heathrow Airport to Southeast Asia from $545

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 16/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
6 Apr — 13 Apr1
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 7 March 2026.

Mon 16/321:10
LHR
-
BKK
1 stop22h 05m
Shenzhen Airlines
Sun 17/503:15
BKK
-
LHR
1 stop22h 35m
Shenzhen Airlines
Deal found 4/3$812
Sat 2/521:20
LHR
-
BKK
1 stop22h 35m
China Eastern
Mon 18/502:10
BKK
-
LHR
1 stop22h 30m
China Eastern
Deal found 4/3$813
Wed 11/321:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Sat 2/519:30
BKK
-
LHR
1 stop30h 30m
Shenzhen Airlines
Deal found 3/3$814
Tue 26/521:20
LHR
-
BKK
1 stop17h 35m
China Eastern
Wed 3/605:05
BKK
-
LHR
1 stop19h 35m
China Eastern
Deal found 3/3$816
Sun 10/521:20
LHR
-
BKK
1 stop17h 35m
China Eastern
Thu 14/505:05
BKK
-
LHR
1 stop19h 35m
China Eastern
Deal found 3/3$817
Thu 9/421:20
LHR
-
BKK
1 stop18h 35m
China Eastern
Sat 16/519:10
BKK
-
LHR
1 stop29h 30m
China Eastern
Deal found 2/3$819
Sun 15/321:10
LHR
-
BKK
1 stop22h 05m
Shenzhen Airlines
Thu 14/512:10
BKK
-
LHR
1 stop37h 50m
Shenzhen Airlines
Deal found 2/3$820
Wed 11/321:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Thu 7/512:10
BKK
-
LHR
1 stop37h 50m
Shenzhen Airlines
Deal found 2/3$822
Tue 5/521:20
LHR
-
BKK
2 stops40h 30m
China Eastern
Tue 2/621:55
BKK
-
LHR
1 stop26h 45m
China Eastern
Deal found 4/3$824
Thu 7/521:20
LHR
-
BKK
1 stop18h 35m
China Eastern
Tue 26/503:00
BKK
-
LHR
2 stops21h 40m
China Eastern
Deal found 3/3$826
Wed 8/421:20
LHR
-
BKK
1 stop18h 35m
China Eastern
Sun 7/615:55
BKK
-
LHR
2 stops32h 45m
China Eastern
Deal found 1/3$830
Wed 11/321:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Sat 4/412:10
BKK
-
LHR
1 stop37h 50m
Shenzhen Airlines
Deal found 3/3$833

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 7 March 2026.

Round-trip from

$813

One-way from

$545

Popular in

July

Cheapest in

May

Average price

$1,195
China Eastern
  • China Eastern
  • 2/6-7/6
  • 2 total stops
  • 44h 20m total
  • London to Southeast Asia
Search Deals
Air China
  • Air China
  • 16/6
  • 1 total stop
  • 37h 05m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($217 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($52 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 7 March 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

Mon 4/5

20:50-08:00

1 stop29h 10m

Phuket City

Fri 15/5

21:00-06:30

1 stop15h 30m

$931

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 20/4

20:50-19:00

1 stop16h 10m

Phuket City

Sun 10/5

21:00-06:30

1 stop15h 30m

$933

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Sun 5/4

08:25-08:00

1 stop17h 35m

Phuket City

Wed 22/4

21:00-19:10

1 stop28h 10m

$938

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Tue 12/5

21:20-22:45

1 stop19h 25m

Phuket City

Tue 19/5

18:55-18:40

2 stops53h 45m

$954

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Thu 23/4

21:20-22:45

1 stop19h 25m

Phuket City

Sat 2/5

18:55-18:40

3 stops53h 45m

$954

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 16/4

20:50-06:50

1 stop28h 00m

Bangkok Suvarnabhumi

Thu 23/4

19:10-06:30

1 stop17h 20m

$980

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 20/4

08:25-19:00

1 stop28h 35m

Phuket City

Mon 27/4

20:50-19:10

1 stop28h 20m

$988

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Fri 1/5

20:50-08:00

1 stop29h 10m

Phuket City

Fri 8/5

21:00-06:30

1 stop15h 30m

$988

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Sat 18/4

20:50-19:55

1 stop17h 05m

Phuket City

Sun 3/5

09:10-06:30

1 stop27h 20m

$988

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Sun 19/4

21:20-18:00

2 stops38h 40m

Phuket City

Sun 10/5

23:05-18:40

1 stop25h 35m

$1,047

Flights are sorted by cheapest return flights first.

Deals found on 3/3

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 $709). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,011). 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 7 March 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 7 March 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 7 March 2026.
See what other customers who have flown with Singapore Airlines and Thai 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
8.2
Very Good
1,470 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

Comfort

8.0

Crew

8.6

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
8.2
Very Good
1,470 reviews
Singapore Airlines
8.2
Very Good
1,470 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

Comfort

8.0

Crew

8.6

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
391 reviews
Singapore Airlines
8.2
Very Good
1,470 reviews
Check prices

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

Comfort

8.0

Crew

8.6

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?

    Oman Air, China Eastern, and Air India can get you from London Heathrow Airport to Southeast Asia in just under 19h 25m. Your travel time can differ by up to 9h 45m. Airlines will cover a distance of 9896 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 Thai Airways (88%), Air Canada (85%) or EVA Air (85%) 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 $779. While the most popular route (London Heathrow - Bangkok Suvarnabhumi) can be booked for $1,536 on average, our data indicates $1,452 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 $709). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,011). 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
Gatwick to Suvarnabhumi flights
Heathrow to Singapore flights

Top airline flying from Heathrow to Southeast Asia

Discover the top airline 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 7 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Thai AirwaysCheapest$1,100Average$1,117FlexibilityNo 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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