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Cheap flights from London Heathrow Airport to Southeast Asia from $633

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 26/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BKK
18 Dec — 25 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap 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 18 November 2025.

Round-trip from

$953

One-way from

$633

Popular in

December

Cheapest in

May

Average price

$1,224
Austrian Airlines
  • Austrian Airlines
  • 16/3-7/5
  • 2 total stops
  • 28h 40m total
  • London to Southeast Asia
Search Deals
26/3
  • 26/3
  • 1 total stop
  • 21h 05m total
  • London to Southeast Asia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($188 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($67 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Find 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 18 November 2025.

Sun 23/1121:10LHR - BKK
1 stop22h 05mShenzhen Airlines
Sat 20/1203:15BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 15/11$958
Sun 23/1121:10LHR - BKK
1 stop38h 20mShenzhen Airlines
Tue 2/1219:30BKK - LHR
1 stop30h 40mShenzhen Airlines
Deal found 16/11$960
Wed 31/1221:10LHR - BKK
1 stop38h 20mShenzhen Airlines
Thu 5/219:30BKK - LHR
1 stop30h 40mShenzhen Airlines
Deal found 16/11$979
Wed 3/1217:40LHR - SIN
1 stop29h 10mAir China
Wed 10/1217:15SIN - LHR
1 stop30h 40mAir China
Deal found 17/11$1,010
Sun 23/1121:10LHR - BKK
1 stop31h 00mShenzhen Airlines
Tue 24/219:30BKK - LHR
1 stop30h 40mShenzhen Airlines
Deal found 15/11$1,012
Sun 7/1221:10LHR - BKK
1 stop31h 00mShenzhen Airlines
Thu 12/203:15BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 17/11$1,013
Sun 30/1121:10LHR - KUL
1 stop22h 10mShenzhen Airlines
Tue 2/1204:20KUL - LHR
1 stop22h 50mShenzhen Airlines
Deal found 17/11$1,029
Fri 21/1121:10LHR - BKK
1 stop22h 05mShenzhen Airlines
Fri 5/1203:15BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 17/11$1,036
Fri 28/1121:10LHR - SIN
1 stop36h 20mShenzhen Airlines
Fri 5/1213:10SIN - LHR
1 stop38h 00mShenzhen Airlines
Deal found 17/11$1,039
Sat 29/1121:10LHR - KUL
1 stop38h 20mShenzhen Airlines
Sat 6/1213:25KUL - LHR
1 stop37h 45mShenzhen Airlines
Deal found 17/11$1,044
Fri 5/1217:50LHR - SIN
1 stop15h 35mLufthansa
Tue 5/523:40SIN - LHR
1 stop16h 00mLufthansa
Deal found 16/11$1,046
Tue 2/1222:00LHR - BKK
1 stop36h 55mChina Southern
Sun 7/1219:15BKK - LHR
2 stops30h 20mChina Southern
Deal found 16/11$1,055

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 18 November 2025.
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

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Fri 8/5

18:40-00:05

2 stops22h 25m

Denpasar Bali Ngurah Rai

Tue 19/5

19:00-14:20

2 stops26h 20m

$1,035

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Wed 6/5

18:40-00:05

2 stops22h 25m

Denpasar Bali Ngurah Rai

Tue 19/5

19:00-14:20

2 stops26h 20m

$1,036

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Thu 7/5

18:40-00:05

2 stops22h 25m

Denpasar Bali Ngurah Rai

Tue 19/5

19:00-14:20

2 stops26h 20m

$1,036

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Thu 7/5

18:40-00:05

2 stops22h 25m

Denpasar Bali Ngurah Rai

Wed 20/5

19:00-08:20

2 stops20h 20m

$1,036

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Wed 6/5

18:40-00:05

2 stops22h 25m

Denpasar Bali Ngurah Rai

Wed 20/5

19:00-08:20

2 stops20h 20m

$1,036

LondonDenpasar

LHR - DPS

LHRDPS

London Heathrow

Thu 16/4

18:40-00:05

2 stops22h 25m

Denpasar Bali Ngurah Rai

Thu 4/6

19:00-08:20

2 stops20h 20m

$1,036

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Fri 28/11

21:10-17:30

1 stop36h 20m

Singapore Changi

Fri 5/12

13:10-19:10

1 stop38h 00m

$1,039

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Sat 29/11

21:10-19:30

1 stop38h 20m

Kuala Lumpur Intl

Sat 6/12

13:25-19:10

1 stop37h 45m

$1,044

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Wed 14/1

20:55-19:35

1 stop14h 40m

Kuala Lumpur Intl

Mon 26/1

09:35-18:10

1 stop16h 35m

$1,067

LondonKuala Lumpur

LHR - KUL

LHRKUL

London Heathrow

Mon 26/1

08:50-19:35

1 stop26h 45m

Kuala Lumpur Intl

Tue 3/3

09:35-06:40

1 stop29h 05m

$1,067

Flights are sorted by cheapest return flights first.

Deals found on 17/11

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 $777). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,135). 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 18 November 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 30% on flights from London Heathrow Airport to Southeast Asia by exploring options for tickets in the afternoon.

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 18 November 2025.

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 18 November 2025.
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
1,404 reviews
Check prices

Food

7.8

Entertainment

8.0

Boarding

8.3

Comfort

8.0

Crew

8.6

Overall

8.1

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
1,404 reviews
Singapore Airlines
8.1
Very Good
1,404 reviews
Check prices

Food

7.8

Entertainment

8.0

Boarding

8.3

Comfort

8.0

Crew

8.6

Overall

8.1

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
362 reviews
Singapore Airlines
8.1
Very Good
1,404 reviews
Check prices

Food

7.8

Entertainment

8.0

Boarding

8.3

Comfort

8.0

Crew

8.6

Overall

8.1

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
7.4
Good
1,305 reviews
Singapore Airlines
8.1
Very Good
1,404 reviews
Check prices

Food

7.8

Entertainment

8.0

Boarding

8.3

Comfort

8.0

Crew

8.6

Overall

8.1

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?

    Shenzhen Airlines, Etihad Airways, and Finnair can get you from London Heathrow Airport to Southeast Asia in just under 14h 40m. Your travel time can differ by up to 21h 40m. Airlines will cover a distance of 10598 km. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from London Heathrow Airport to Southeast Asia one-way?

    To fly one-way, consider booking your trip with Gulf Air, which is currently one of the cheapest options available, starting at $636. Shenzhen Airlines flights start at $654 while deals on SWISS start at $679 one-way.

  • 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 - Phuket City.

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

    Consider EVA Air (85%), Thai Airways (82%) or Air Canada (78%) 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 $1,033. While the most popular route (London Heathrow - Bangkok Suvarnabhumi) can be booked for $978 on average, our data indicates $1,656 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 $777). Flying from London Heathrow Airport to Southeast Asia in July is currently the most expensive (average of $1,135). 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

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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.
Gatwick to Suvarnabhumi flights
Heathrow to Singapore flights
Heathrow 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 18 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Etihad AirwaysCheapest$1,081Average$1,443FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Thai AirwaysCheapest$1,186Average$1,230FlexibilityNo 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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