A Singapore Airlines (SIA) flight bound for London had to turn back after cabin crew reported a fault with two of the aircraft's air conditioning units.

Flight SQ322, an Airbus A-380 operating between Singapore and London, departed here at 2.25am on Saturday.

An SIA spokesman said the plane returned and landed at Changi Airport around 3am.

He said several of the plane's tyres deflated on landing, so passengers had to disembark from the aircraft onto the tarmac.

Passengers were put on a replacement aircraft, and the delayed flight departed for London again at around 11am. The flight between Singapore and London takes more than 13 hours.