Three Airbus A320 charter flights carrying about 500 passengers will arrive in Invercargill on Saturday for the Bluff Oyster & Food Festival.
Last year, Air New Zealand put on one charter flight.
Venture Southland tourism and events manager Warrick Low said if more tickets had been available, the airline could have put on a further six flights.
Festival committee member Kylie Fowler said despite having more than 1000 people on its waiting list, the committee would not consider making the festival a two-day event.
It was run by a volunteer group and many stallholders would probably not be willing to be away from their businesses for a second day.