How long is the flight from London to Southeast Asia?

Airlines like Air China, SWISS, and Shenzhen Airlines fly from London to Southeast Asia in about 16h 50m. The time it takes to get you to your destination can typically vary by up to 35h 35m. The distance from London to Southeast Asia is about 6757 mi. Both multi-stop and direct flights can be found to your destination and back.

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

The cheapet airlines for a one-way flight from London to Southeast Asia are Shenzhen Airlines (£255), Hainan Airlines (£291), and China Eastern (£295).

In terms of precipitation, rainfall in Southeast Asia ranges from 10.0 - 320.0 inches per month. September is typically the wettest month, when rainfall can reach 320.0 mm. January is typically the driest time to visit Southeast Asia when rainfall is around 10.0 mm.

If weather is an important factor for your trip to Southeast Asia, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 30.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 26.0 C).

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

The most popular route from London to Southeast Asia is London Heathrow - Bangkok Suvarnabhumi. You may also consider London Gatwick - Bangkok Suvarnabhumi or London City - Bangkok Suvarnabhumi.

What are the cheapest flights from London to Southeast Asia?

The cheapest flight price from London to Southeast Asia is £438. On average you can expect to pay £2,655. The most popular route, (London Heathrow - Bangkok Suvarnabhumi), can usually be booked for £331.

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

No one likes to see their flight delayed. When booking a flight from London to Southeast Asia consider choosing EVA Air (82%), Thai Airways (77%) or Air Canada (69%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from London to Southeast Asia?

Sichuan Airlines, A.P.G. and Air France are the most popular airlines when flying from London to Southeast Asia.

How far in advance should I book a flight from London to Southeast Asia?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 57 days in advance, which can save you up to 50% on flights from London to Southeast Asia compared to booking the week you need them. Waiting 57 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at £566. For sooner than that we have options available in the next 3 days from £673.

What is the cheapest month to fly from London to Southeast Asia?

Our data shows that May tends to be the cheapest month to fly to Southeast Asia from London. Users have commonly found prices around £637 for the month, but tickets can be as low as £279. Due to multiple factors, prepare for potentially higher prices in December.

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 holiday 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.

£253+ Cheap Flights from London to Southeast Asia

Cheap flight deals from London to Southeast Asia

Round-trip from	£432
One-way from	£253
Popular in	December
Cheapest in	May
Average price	£540

Air China
31/10-8/11
2 total stops
40h 45m total
London to Southeast Asia

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Shenzhen Airlines
21/9
1 total stop
22h 15m total
London to Southeast Asia

Search Deals

Highest demand for flights based on searches. 8% potential increase in price (£45 potential increase over avg. return price).

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Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return 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 16 September 2025.

Fri 31/1017:40LHR - BKK

1 stop17h 25mAir China

Sat 8/1101:30BKK - LHR

1 stop23h 20mAir China

Deal found 15/9£432

Sun 9/1105:55STN - BKK

2 stops21h 35mMultiple Airlines

Sat 6/1214:40BKK - STN

1 stop28h 05mMultiple Airlines

Deal found 15/9£432

Sun 5/1021:50LGW - BKK

3 stops31h 30mMultiple Airlines

Mon 27/1012:30BKK - LGW

Nonstop13h 00mMultiple Airlines

Deal found 15/9£433

Thu 27/1117:40LHR - BKK

1 stop17h 25mAir China

Fri 26/1219:30BKK - LHR

1 stop27h 25mAir China

Deal found 15/9£433

Sun 28/913:15LTN - BKK

2 stops44h 55mMultiple Airlines

Fri 3/1017:10BKK - LTN

2 stops35h 35mMultiple Airlines

Deal found 15/9£433

Thu 27/1106:35LGW - BKK

2 stops23h 30mMultiple Airlines

Sun 14/1209:15BKK - LGW

1 stop30h 20mMultiple Airlines

Deal found 15/9£433

Thu 2/1022:00LHR - BKK

1 stop37h 05mAir China

Thu 16/1019:35BKK - LHR

1 stop28h 10mAir China

Deal found 15/9£433

Thu 13/1114:00LTN - BKK

2 stops48h 05mMultiple Airlines

Sun 23/1110:10BKK - LTN

2 stops44h 00mMultiple Airlines

Deal found 15/9£433

Sun 23/1105:55STN - BKK

2 stops21h 35mMultiple Airlines

Sun 14/1209:15BKK - STN

1 stop17h 50mMultiple Airlines

Deal found 15/9£433

Fri 14/1121:00LHR - MNL

1 stop20h 00mChina Eastern

Mon 24/1102:05MNL - LHR

1 stop23h 25mChina Eastern

Deal found 15/9£434

Wed 26/1117:40LHR - BKK

1 stop17h 25mAir China

Mon 19/101:30BKK - LHR

1 stop21h 25mAir China

Deal found 15/9£434

Thu 13/1113:30STN - BKK

2 stops20h 25mMultiple Airlines

Sat 6/1214:40BKK - STN

1 stop28h 05mMultiple Airlines

Deal found 15/9£434

Best flights from London to Southeast Asia
Discover carefully curated flight deals from London to Southeast Asia that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2025.

Mon 19/111:40LGW - MNL

2 stops52h 25mAir China

Tue 3/206:20MNL - LGW

2 stops32h 35mAir China

Deal found 15/9£481

Tue 11/1117:10LHR - SIN

1 stop16h 50mSWISS

Sun 16/1100:05SIN - LHR

2 stops21h 35mSWISS

Deal found 15/9£494

Tue 11/1117:50LHR - SIN

1 stop15h 35mMultiple Airlines

Sat 15/1100:05SIN - LHR

1 stop16h 00mMultiple Airlines

Deal found 15/9£495

Fri 3/1022:05LHR - MNL

1 stop20h 35mShenzhen Airlines

Thu 16/1002:55MNL - LHR

1 stop24h 05mShenzhen Airlines

Deal found 14/9£521

Thu 9/1010:00LHR - SIN

1 stop19h 20mGulf Air

Thu 20/1120:25SIN - LHR

1 stop26h 20mGulf Air

Deal found 15/9£522

Fri 21/1120:55LHR - BKK

1 stop19h 25mEtihad Airways

Thu 4/1202:55BKK - LHR

1 stop18h 35mEtihad Airways

Deal found 15/9£527

Tue 2/1221:15LGW - BKK

Nonstop11h 50mBritish Airways

Mon 19/118:55BKK - LGW

1 stop18h 00mBritish Airways

Deal found 15/9£579

Sun 28/909:00LGW - BKK

1 stop15h 55mQatar Airways

Sat 18/1020:00BKK - LGW

1 stop16h 40mQatar Airways

Deal found 14/9£589

Tue 10/214:00LGW - BKK

1 stop16h 40mSAUDIA

Fri 13/301:15BKK - LGW

1 stop17h 45mSAUDIA

Deal found 14/9£596

Thu 15/117:05LGW - MNL

1 stop17h 05mTurkish Airlines

Mon 9/221:35MNL - LGW

1 stop26h 35mTurkish Airlines

Deal found 15/9£640

Tue 25/1120:05LCY - BKK

1 stop31h 00mKLM

Tue 20/111:35BKK - LCY

2 stops26h 40mKLM

Deal found 15/9£648

Sat 17/115:45LHR - MNL

1 stop17h 35mKuwait Airways

Wed 11/222:00MNL - LHR

1 stop23h 45mKuwait Airways

Deal found 15/9£651