Four Melbourne-bound international flights have been diverted to other cities due to heavy fog.
Two flights from Christchurch and one from Tokyo were diverted to Sydney on Friday morning.
Another from Denpasar landed in Adelaide.
The weather caused delays to both international and domestic flight schedules.
It's unclear when the fog is set to lift and the airport is bracing for further disruptions throughout the day.
"Flights are still landing, flights are still departing, it's just a bit of a slower process because flights need to be escorted when you have low visibility conditions," Melbourne Airport spokesperson Rebecca Arnold told AAP.
It comes after parts of the airport were flooded late on Thursday as heavy rains pelted Melbourne during two storms in a matter of hours, causing delays to several flights.
Crews were still clearing debris created by the water damage on Friday morning.
The airport is set to experience an influx of travellers this Christmas, the first end of year holiday period in three years without COVID restrictions.
January 6 is shaping up to be the busiest day for travel.
