Firefighters have been called to a fire at Auckland International Airport.

A fire in the duty free area of Auckland airport's international terminal resulted in a small evacuation, but won't cause flight delays.

Fire crews responded just before 7pm on Thursday evening.

The fire was extinguished quickly and flights have resumed to normal operation.

Airport fires are always taken extremely seriously and emergency services evacuated the area, an airport spokeswoman said.

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Flight delays were possible, but will only be slight - if at all, she said.

LAINE MOGER/STUFF Passengers were left stranded outside Auckland airport for hours when a fire forced the evacuation of the international terminal on December 8.

Rohan Fozzy, who was at the airport when the alarms went off, confirmed some passengers were directed to another area of the airport.

"It was not a full evacuation," Fozzy said.

"No flights were delayed but everyone has been advised to stay in their areas for departure.

The evacuated area at Auckland Airport, is now re-open. A few minor delays to flights. Auckland Airport would like to thank everyone for there patience during the incident — Auckland Airport (@AKL_Airport) December 27, 2018

Earlier this month, passengers were left stranded for up to six hours when a fire in an air conditioning unit caused the international terminal's check in, departures and baggage hall to close.

Up to 5000 travellers were affected and dozens contacted Stuff with complaints about the evacuation process, with many saying they were stuck inside without food or water, while others were left outside with no toilet access.

The fire was extinguished quickly but the airport's automated sprinkler system caused significant flooding, which had to be cleared before it could reopen.

In total, 16 flights were delayed and three were rescheduled. The airport later apologised for the disruption and said a review of its procedures would take place.