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Cheap flights from London to Southeast Asia from C$ 555

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 30/10. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BKK
15 Oct — 22 Oct1
1 adult
1 adult, Economy

Cheap flight deals from London to Southeast Asia

Keep the following information in mind while searching for London to Southeast Asia flight deals. Data was last updated 15 September 2025.

Round-trip from

C$ 825

One-way from

C$ 555

Popular in

December

Cheapest in

November

Average price

C$ 1,055
Norse Atlantic UK
  • Norse Atlantic UK
  • 2/12-16/12
  • Nonstop
  • 24h 25m total
  • London to Southeast Asia
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30/10
  • 30/10
  • 2 total stops
  • 31h 30m total
  • London to Southeast Asia
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Highest demand for flights based on searches. 4% potential increase in price (C$ 82 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 61 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from London to Southeast Asia

Cheapest flights from London to Southeast Asia
Explore the most affordable flight options available from London to Southeast Asia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2025.

Tue 2/124:00 p.m.LGW - BKK
Nonstop11h 25mNorse Atlantic UK
Tue 16/128:25 a.m.BKK - LGW
Nonstop13h 00mNorse Atlantic UK
Deal found 13/9C$ 825
Tue 4/114:00 p.m.LGW - BKK
Nonstop11h 25mNorse Atlantic UK
Thu 18/1212:25 p.m.BKK - LGW
Nonstop12h 55mNorse Atlantic UK
Deal found 13/9C$ 834
Sun 2/119:10 p.m.LHR - BKK
1 stop31h 00mShenzhen Airlines
Sat 29/113:15 a.m.BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 15/9C$ 834
Fri 7/119:10 p.m.LHR - BKK
1 stop38h 20mShenzhen Airlines
Fri 5/127:30 p.m.BKK - LHR
1 stop30h 40mShenzhen Airlines
Deal found 15/9C$ 836
Tue 2/129:15 a.m.LGW - BKK
1 stop33h 10mMultiple Airlines
Mon 15/1212:40 p.m.BKK - LGW
1 stop26h 55mMultiple Airlines
Deal found 13/9C$ 862
Wed 26/114:00 p.m.LGW - BKK
Nonstop11h 25mNorse Atlantic UK
Wed 3/1212:30 p.m.BKK - LGW
Nonstop13h 00mNorse Atlantic UK
Deal found 15/9C$ 863
Sun 2/114:00 p.m.LGW - BKK
Nonstop11h 25mNorse Atlantic UK
Wed 5/1112:30 p.m.BKK - LGW
Nonstop13h 00mNorse Atlantic UK
Deal found 13/9C$ 869
Sat 13/121:55 p.m.LGW - BKK
2 stops26h 25mMultiple Airlines
Thu 25/1212:25 p.m.BKK - LGW
Nonstop12h 55mMultiple Airlines
Deal found 14/9C$ 873
Thu 9/109:50 p.m.LGW - BKK
2 stops42h 50mMultiple Airlines
Tue 4/111:55 a.m.BKK - LGW
1 stop19h 05mMultiple Airlines
Deal found 15/9C$ 874
Fri 26/910:05 p.m.LHR - BKK
1 stop22h 10mShenzhen Airlines
Tue 11/1112:10 p.m.BKK - LHR
1 stop38h 00mShenzhen Airlines
Deal found 13/9C$ 876
Fri 26/910:05 p.m.LHR - BKK
1 stop22h 10mShenzhen Airlines
Sat 25/103:15 a.m.BKK - LHR
1 stop22h 55mShenzhen Airlines
Deal found 15/9C$ 877
Sun 30/114:00 p.m.LGW - BKK
Nonstop11h 25mNorse Atlantic UK
Tue 16/128:25 a.m.BKK - LGW
Nonstop13h 00mNorse Atlantic UK
Deal found 13/9C$ 886

Cheapflights Fare Finder

 
Customize your flight search to find flights from London 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 629,999 searches. Data last updated 15 September 2025.
Use the filters below to find and compare flights from London to Southeast Asia that are best for you.

Fly from

London

Fly to

Southeast Asia

Route

Depart

Return

Price

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 12/11

8:50 a.m.-6:25 p.m.

1 stop26h 35m

Phnom Penh Pochentong

Mon 1/12

7:55 a.m.-2:30 p.m.

1 stop37h 35m

C$ 966

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Thu 13/11

8:50 a.m.-6:30 a.m.

1 stop14h 40m

Phnom Penh Pochentong

Mon 8/12

7:55 a.m.-6:40 a.m.

1 stop29h 45m

C$ 966

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 17/11

8:50 a.m.-6:25 p.m.

1 stop26h 35m

Phnom Penh Pochentong

Mon 1/12

7:55 a.m.-6:40 a.m.

1 stop29h 45m

C$ 966

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Thu 13/11

8:50 a.m.-6:30 a.m.

1 stop14h 40m

Phnom Penh Pochentong

Tue 2/12

7:55 a.m.-6:10 p.m.

1 stop17h 15m

C$ 966

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sun 16/11

8:55 p.m.-6:30 a.m.

1 stop26h 35m

Phnom Penh Pochentong

Mon 1/12

7:55 a.m.-2:30 p.m.

1 stop37h 35m

C$ 966

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 12/11

8:55 p.m.-6:25 p.m.

1 stop14h 30m

Phnom Penh Pochentong

Tue 9/12

7:55 a.m.-6:10 p.m.

1 stop17h 15m

C$ 966

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Thu 9/10

7:10 p.m.-8:05 p.m.

1 stop18h 55m

Bangkok Suvarnabhumi

Wed 5/11

7:35 p.m.-7:15 a.m.

1 stop18h 40m

C$ 1,079

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Thu 9/10

9:00 a.m.-7:50 a.m.

1 stop16h 50m

Phuket City

Tue 4/11

8:25 a.m.-6:15 a.m.

1 stop28h 50m

C$ 1,084

LondonBangkok

LGW - BKK

LGWBKK

London Gatwick

Mon 6/10

2:55 p.m.-7:20 p.m.

1 stop22h 25m

Bangkok Suvarnabhumi

Wed 22/10

8:40 a.m.-6:40 a.m.

1 stop28h 00m

C$ 1,101

LondonBangkok

LGW - BKK

LGWBKK

London Gatwick

Wed 14/1

8:40 a.m.-6:25 p.m.

1 stop26h 45m

Bangkok Suvarnabhumi

Wed 28/1

11:10 p.m.-5:30 a.m.

Nonstop13h 20m

C$ 1,107

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/9

Showing 1-10 of 60 results
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Best time to book a flight from London to Southeast Asia

Have a flexible travel schedule? Discover the best time to fly to Southeast Asia from London with our price prediction graph.
Estimated round-trip 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 to Southeast Asia

What is the cheapest month to book a flight from London to Southeast Asia?

Currently, September is the cheapest month in which you can book a flight from London to Southeast Asia (average of C$ 917). Flying from London to Southeast Asia in December is currently the most expensive (average of C$ 1,387). 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 LON to YJX?

Find hourly flight availability from London 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 15 September 2025.

When flying from London 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 to Southeast Asia

Explore weekly flight availability from London 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 15 September 2025.

The most flights from LON 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).

Related info for your journey

Find useful and relevant information for your journey from London 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 to Southeast Asia?

    There are many flights that can get you from London to Southeast Asia in 18h 55m. Fly via Etihad Airways, Vietnam Airlines, or British Airways to get the fastest option. Airlines will cover a distance of 9571 km. This flight may include one or multiple stops.

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

    The cheapest airlines for a one-way flight from London to Southeast Asia are Shenzhen Airlines (C$ 569), Norse Atlantic UK (C$ 602), and Air China (C$ 615).

  • What are the most popular routes from London to Southeast Asia?

    Most travellers choose London Gatwick - Bangkok Suvarnabhumi, London Heathrow - Bangkok Suvarnabhumi or London Heathrow - Phuket City when deciding on the best route from London to Southeast Asia.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from London to Southeast Asia on time: EVA Air (82%), Thai Airways (77%), Air Canada (69%).

  • What are the cheapest flights from London to Southeast Asia?

    While on average a flight from London to Southeast Asia is generally C$ 1,795, our data shows the cheapest flight currently is C$ 1,172. When looking at the most popular route, (London Gatwick - Bangkok Suvarnabhumi), you can expect to pay C$ 808 for that flight.

  • Can I find deals for flights from London to Southeast Asia that include hotel bookings?

    Yes. In addition to deals on London to Southeast Asia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from London to Southeast Asia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Southeast Asia.

  • Can I find deals for business class flights from London to Southeast Asia?

    Yes. Cheapflights offers flight deals from London 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 to Southeast Asia?

    Currently, September is the cheapest month in which you can book a flight from London to Southeast Asia (average of C$ 917). Flying from London to Southeast Asia in December is currently the most expensive (average of C$ 1,387). 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 London to Southeast Asia

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to New Delhi flights
Heathrow to Suvarnabhumi flights
Heathrow to Phuket City flights
Heathrow to Manila flights

Top 3 airlines flying from London to Southeast Asia

Discover the top 3 airlines that operate flights from London 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 629,999 searches. Data last updated 15 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Thai AirwaysCheapestC$ 744AverageC$ 1,575FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights
Air ChinaCheapestC$ 770AverageC$ 846FlexibilityNo cancel feeOn-time67%
Search Air China flights
EVA AirCheapestC$ 1,248AverageC$ 1,405FlexibilityNo cancel feeOn-time74%
Search EVA Air flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to Southeast Asia?

When you search for this flight from London 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 London to Southeast Asia?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Southeast Asia from London.

Can Cheapflights find flights from London to Southeast Asia with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from London to Southeast Asia flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from London to Southeast Asia become cheaper?

Yes, Cheapflights offers price alerts on London to Southeast Asia flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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