Air New Zealand is offering $7 tickets between Auckland and Wellington in the week leading up to Christmas.
The special Night Rider fares have gone on sale for travel on the airline's late-night flights between December 17 to 24, undercutting Qantas-owned Jetstar's $19 fare each way with no checked baggage.
Air New Zealand launched its $29 Night Rider service a week ago, with 133 seats on the last Boeing 737 flight of the day between Wellington and Auckland from November 5 slashed to one low price.
Chief executive officer Rob Fyfe said the "unbelievably low fares" should be a boost to retailers.
"We reckon there are plenty of Wellingtonians and Aucklanders who would love to jump on a plane and head out of town to do their Christmas shopping."