"Operations have become normal," Airport Director Janardhanan told PTI.
Two Air India Express flights have landed and one flight diverted to Bangalore will be landing shortly, he said.
Personnel of the CISF and Air Airports Authority of India (AAI) had clashed with Fire Force department at the airport last night over frisking of an AAI official leading to tension.
Following this, at least three flights had been diverted to Kochi's Nedumbassery airport.
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"We reached Kochi around 3.30 am this morning and were allowed to leave the aircraft only two hours later", a woman passenger with a young daughter said.
Another passenger said other than a piece of cake, few chips and a bottle of water served during the flight from Dammam, they have not had any food.
In an ugly turn of incidents, a CISF jawan was killed last night and at least three others were injured in a clash between the CISF personnel and airport authority employees at Karipur International airport here.
There is a heavy posse of police personnel at the airport.