Jetstar is celebrating seven years of domestic operations by offering passengers a free return leg ticket for flights to a range of domestic and trans-Tasman destinations.

The sale started this morning for travel periods between October-December and February-March 2017.

Jetstar's head of New Zealand Grant Kerr said seven years was a major milestone for the company.

"It's been a very big year for Jetstar's New Zealand operations with significant growth," he said. "We're delighted to be celebrating by offering thousands of more reasons to travel with us."

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Its birthday sale fares start from $39 return. The airline does not say how many of the free flights are being offered as part of the promotion.