Stewart Island Flights is a regional New Zealand airline offering scheduled and scenic flights from its base in Invercargill to Stewart Island. It is a locally owned and operated company. Stewart Island Flights was previously called Southern Air and then Southern Air 1997 Ltd. South East Air Ltd is the parent company and holder of the Air Operator Certificate, under which Stewart Island Flights and Invercargill Aircraft Maintenance are operated.
Stewart Island Flights has scheduled flights between Invercargill and Stewart Island, and are operated 3 x daily all year. Scenic flights operate on an ad-hoc basis around Stewart Island and Southland. South East Air started an IFR post run from Invercargill to Dunedin and return on 4 June 1996 using a Piper PA32 Cherokee.