Emirates flight EK441 departed Adelaide Airport at 10:35pm on Monday bound for Dubai, but pilots turned the Airbus A350-900 around before the aircraft reached the West Australian border.
The plane landed shortly after 2am on Tuesday. An Adelaide Airport spokesperson said fire trucks attended the arrival "as a precaution". "Passengers have either returned home or have been accommodated in hotels," the spokesperson said, adding that passengers had been rebooked on Tuesday night's Emirates flight.
An Emirates spokesperson described the cause as a "technical fault", and said everyone on board "safely disembarked". "Emirates apologises for any inconvenience caused, but the safety of our passengers and crew is of utmost importance and will not be compromised," the spokesperson said.
The airline said it would accommodate passengers with onwards connections. Further details on the nature of the fault have not been released.