KAA Managing Director Lucy Mbugua says this is so to cater for vehicle security checks during entry to the airport.
Kenya’s main airport has been facing security challenges in the recent past that include a fire that paralysed operations for three days in August 2013 as well as an explosion that was reported on January 17, 2014.
The fire at JKIA in August 2013 was caused by an electrical fault according the Infrastructure and Transport Secretary Michael Kamau.
In a recent incident, an explosion occurred at a restaurant at the airport leading to heightened security fears.
Interior Principal Secretary Mutea Iringo said they were keen to establish if it was terror-related.
National carrier Kenya Airways also advised travellers departing from JKIA in Nairobi to plan to be at the airport at least an hour before normal check-in time.
“This is to allow for sufficient time to go through the enhanced security checks and be on time for scheduled flights,” Kenya Airways said in a statement sent to newsrooms.