Jetstar says it's buzzing to be able to help Hamilton and Dunedin get international flights again.

The airline's launching new routes from Hamilton to Sydney and the Gold Coast from June next year.

It's the first time the city's had international flights since 2012.

Dunedin will also return to the international schedule - with flights between the city and the Gold Coast from next June. 

Jetstar CEO Stephanie Tully told Heather du Plessis-Allan they've left plenty of time for the airports to prepare.

She says Hamilton will need to touch up their customs and immigration areas.

Plus, Tully says it'd be a good thing if its move into Hamilton promotes competition with Auckland Airport.

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