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Cheap flights from London Heathrow Airport to Southeast Asia from $551

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 17/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
22 Mar — 29 Mar1
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 20 February 2026.

Fri 10/412:30
LHR
-
BKK
1 stop19h 05m
Air India
Tue 28/414:45
BKK
-
LHR
1 stop25h 30m
Air India
Deal found 17/2$805
Tue 2/621:20
LHR
-
HKT
1 stop18h 40m
China Eastern
Mon 15/600:20
HKT
-
LHR
1 stop24h 20m
China Eastern
Deal found 18/2$816
Mon 11/521:20
LHR
-
BKK
1 stop17h 35m
China Eastern
Mon 25/509:50
BKK
-
LHR
1 stop38h 50m
China Eastern
Deal found 18/2$816
Sat 7/321:10
LHR
-
BKK
1 stop38h 20m
Shenzhen Airlines
Sun 15/319:30
BKK
-
LHR
1 stop30h 40m
Shenzhen Airlines
Deal found 19/2$818
Wed 20/521:20
LHR
-
BKK
1 stop17h 35m
China Eastern
Tue 2/621:55
BKK
-
LHR
1 stop26h 45m
China Eastern
Deal found 19/2$819
Tue 9/621:20
LHR
-
HKT
1 stop18h 40m
China Eastern
Tue 16/623:05
HKT
-
LHR
1 stop25h 35m
China Eastern
Deal found 17/2$821
Sun 10/521:20
LHR
-
BKK
1 stop21h 20m
China Eastern
Wed 27/521:55
BKK
-
LHR
1 stop26h 45m
China Eastern
Deal found 17/2$821
Sun 19/421:20
LHR
-
BKK
1 stop24h 45m
China Eastern
Sun 10/521:55
BKK
-
LHR
1 stop26h 45m
China Eastern
Deal found 16/2$822
Mon 2/321:10
LHR
-
BKK
1 stop22h 05m
Shenzhen Airlines
Thu 28/512:10
BKK
-
LHR
1 stop37h 50m
Shenzhen Airlines
Deal found 17/2$823
Mon 2/321:10
LHR
-
BKK
1 stop31h 00m
Shenzhen Airlines
Tue 10/303:15
BKK
-
LHR
1 stop22h 55m
Shenzhen Airlines
Deal found 16/2$825
Tue 19/521:20
LHR
-
HKT
1 stop18h 40m
China Eastern
Mon 1/618:55
HKT
-
LHR
2 stops53h 45m
China Eastern
Deal found 19/2$826
Mon 20/421:20
LHR
-
BKK
1 stop24h 45m
China Eastern
Sat 16/513:20
BKK
-
LHR
2 stops59h 20m
China Eastern
Deal found 19/2$826

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 20 February 2026.

Round-trip from

$791

One-way from

$551

Popular in

July

Cheapest in

May

Average price

$1,178
China Eastern
  • China Eastern
  • 7/3-22/3
  • 2 total stops
  • 47h 50m total
  • London to Southeast Asia
Search Deals
Air China
  • Air China
  • 17/6
  • 1 total stop
  • 37h 05m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($229 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($51 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 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 20 February 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

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 7/3

21:10-18:30

1 stop38h 20m

Bangkok Suvarnabhumi

Sun 15/3

19:30-19:10

1 stop30h 40m

$818

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 2/3

21:10-02:15

1 stop22h 05m

Bangkok Suvarnabhumi

Tue 17/3

19:30-19:10

1 stop30h 40m

$823

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 11/5

21:20-22:45

1 stop19h 25m

Phuket City

Mon 25/5

18:55-18:40

2 stops53h 45m

$833

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 6/3

21:10-11:10

1 stop31h 00m

Bangkok Suvarnabhumi

Thu 19/3

12:10-19:10

1 stop38h 00m

$839

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 1/5

22:05-18:30

1 stop38h 25m

Bangkok Suvarnabhumi

Sun 31/5

12:10-19:50

1 stop37h 40m

$843

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Sat 11/4

22:05-02:15

1 stop22h 10m

Bangkok Suvarnabhumi

Tue 28/4

03:15-20:00

1 stop22h 45m

$860

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 8/4

22:05-02:15

1 stop22h 10m

Bangkok Suvarnabhumi

Thu 7/5

19:30-20:00

1 stop30h 30m

$866

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 23/4

13:50-13:35

1 stop17h 45m

Bangkok Suvarnabhumi

Thu 14/5

20:20-10:15

1 stop19h 55m

$890

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 11/3

21:00-01:15

3 stops45h 15m

Bangkok Suvarnabhumi

Fri 27/3

19:05-17:30

1 stop29h 25m

$928

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Mon 9/3

21:00-22:45

1 stop18h 45m

Phuket City

Sat 28/3

19:35-17:40

2 stops53h 05m

$930

Flights are sorted by cheapest return flights first.

Deals found on 16/2

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 $706). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,018). 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 20 February 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 20 February 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 20 February 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
1,463 reviews
Check prices

Boarding

8.3

Crew

8.6

Overall

8.2

Comfort

8.0

Entertainment

8.0

Food

7.8

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
1,463 reviews
Singapore Airlines
8.2
Very Good
1,463 reviews
Check prices

Boarding

8.3

Crew

8.6

Overall

8.2

Comfort

8.0

Entertainment

8.0

Food

7.8

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
384 reviews
Singapore Airlines
8.2
Very Good
1,463 reviews
Check prices

Boarding

8.3

Crew

8.6

Overall

8.2

Comfort

8.0

Entertainment

8.0

Food

7.8

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?

    Shenzhen Airlines, China Eastern, and Etihad Airways can get you from London Heathrow Airport to Southeast Asia in just under 19h 25m. Your travel time can differ by up to 18h 55m. 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 - Singapore Changi or London Heathrow - Denpasar Bali Ngurah Rai.

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

    Consider Thai Airways (86%), EVA Air (84%) or Air Canada (83%) 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 $1,287. While the most popular route (London Heathrow - Bangkok Suvarnabhumi) can be booked for $1,487 on average, our data indicates $1,456 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 $706). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,018). 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.
Heathrow to Suvarnabhumi flights
Heathrow to Singapore flights
Gatwick to Suvarnabhumi 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 20 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Thai AirwaysCheapest$1,095Average$1,125FlexibilityNo 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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