Auckland Airport's domestic terminal was temporarily evacuated this morning after a fire sprinkler was set off.

A spokesman for the airport said the sprinkler was activated at Jetstar's domestic terminal baggage hold area around 8.45am.

"We think that it may have been caused by a contractor hitting something, but we're yet to confirm that.

"There is some water around, so we're just waiting for that to be sorted."

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Two domestic flight arrivals and three departures were affected as a result of the evacuation, the spokesman said.

Airport staff and the public were allowed to re-enter the terminal shortly after 9.15am.