The scrap for travellers' dollars will intensify further in September, with Pacific Blue announcing it is to start new trans-Tasman services.

The Christchurch-based airline, a subsidiary of Virgin Blue, said it would be adding routes to Sydney from Queenstown and Wellington, and to Brisbane from Dunedin.

Last week it announced it would also be flying from Hamilton to Australia from September, with three flights a week to Sydney and three to Brisbane.

The new services are two flights a week between Queenstown and Sydney, three flights between Dunedin and Brisbane, and three flights between Wellington and Sydney.

Virgin Blue Group chief executive Brett Godfrey said that when the new services started, Pacific Blue would have international flights from six New Zealand airports - the others being Auckland and Christchurch - which was more than any other airline.

NZPA