Hawaiian operates return flights up to four times a week and has just launched new tactical fares to Honolulu and outer islands starting at $497 one-way, for bookings before August 8.
The airline said its Auckland-Honolulu service reinvigorated interest in Hawaii as a destination.
"We observe airline competitor activity with interest and expect seasonal capacity shifts to occur, but we remain focused on our own plans. Hawaiian Airlines sees additional and sustainable growth continuing from Pacific Rim countries including New Zealand," said a spokesman.
When destinations boomed in popularity, other airlines sought to capitalise, he said.
"Hawaii is our home base and our speciality, and we look forward to welcoming a growing number of Kiwis."
Signs of more intense competition come as figures from the Hawaiian Tourism Authority show the number of Kiwi visitors to the state increased by more than 6 per cent to more than 27,000 in the first six months of the year.
Darragh Walshe of Hawaii Tourism said the extra flights over the school holidays would help push down fares.
"It has been competition and the associated additional flights that has brought the airfares down over the last few years. So this will add a further edge to the competitive environment. We have seen full flights over the school holidays which naturally drives airfares up."
Sean Berenson, Flight Centre NZ general manager product, said news of increased capacity could only mean good things for customers, providing more options and helping to drive competition.
''In recent years we've seen Hawaiian Airlines entering the market and increased capacity from Air New Zealand stimulate the market and drive competition on the route, resulting in increased accessibility and affordability.''
Fares through Flight Centre had dropped as low as $699 per person return when three years ago a similar fare would have cost around $2000.