"These sorts of things do flow on and more people do come even when prices return to more normal levels."
Mr Thomas said it was good timing by the airline, which would pick up early summer demand.
He doubted whether Air NZ, which he estimated had 85 per cent of the domestic market, would respond to the $7 fare.
Jetstar chief executive David Hall said the airline was breaking the monopoly on a seventh domestic route.
"Queenstown is one of the region's premier tourist spots and we're very pleased to be increasing domestic and international links as part of our overall commitment to the New Zealand market."
Air NZ's group general manager for Australia, Bruce Parton, said he was not worried about the promotion. Kiwi travellers had been taking advantage of the airline's sale of 1000 fares under $20 designed to fill up planes for the remainder of the Rugby World Cup.
"We all look to put cheap fares out there to stimulate travel. We've had fares even this week of $3 and $5. We've done $1 fares at Grabaseat for five years. I don't think seven bucks is such a bargain - the Australians take a while to come up to speed."