Air Chathams is tweaking its flight schedule, saying it will provide a faster turnaround and less congestion on the more popular flights.

The changes, which will affect some Whanganui and Whakatāne flights, come as the airline's passenger service grows and it prepares to introduce its Kāpiti Coast-Auckland service on August 20.

From Monday, August 20, Whanganui passengers flying to Auckland on weekdays will leave 10 minutes earlier with take-off scheduled for 6.45am instead of 6.55am.

The first flight of the day from Auckland to Whanganui will depart at 8.20am instead of 8.30am.

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The Monday to Friday afternoon flight from Auckland to Whanganui will be at 3pm instead of 3.15pm.

Air Chathams commercial manager Adrian Ali says this will ensure a faster turnaround for those departing back to Auckland on the connecting flight.

There are no changes to the Saturday and Sunday schedules.