A Qantas flight carrying passengers from Los Angeles to Melbourne has turned back after an engine problem was discovered, the airline confirmed on Sunday.

QF94 A380 was on its way to Australia on Friday when the pilots discovered an issue with one of the aircraft’s four engines.

The airline denied reports that one of the engines was on fire. The faulty engine, however, had to be shut down and the plane returned to Los Angeles airport, where it landed safely at around 3am.

“Reports that the engine was ‘on fire’ aren’t correct; passengers may have seen some sparks before it was safely shut down by the flight crew," the Aussie carrier said in a statement.

Passengers were transferred to a replacement flight that left LA at around 2.30pm on Saturday and is scheduled to arrive in Melbourne on Sunday night.