Air New Zealand is adding 145 flights between Auckland and Napier from January to March.
The move follows the withdrawal of rival Jetstar's regional services.
Air NZ said on Tuesday it would add the additional flights, a total of 9172 seats between Auckland and Napier, to its schedule at the start of 2020.
The flights are included in the 586 additional one-way flights expected to be operated by the airline.
The other destinations included in the additional flights are Auckland to New Plymouth, Nelson and Palmerston North, as well as between Nelson and Wellington.