School holiday chaos as flights cancelled

Nearly 30 flights scheduled to take off before midday are listed as cancelled on June 30 with the airport operating with a single runway.

"Sydney Airport has been advised by Airservices Australia that single runway operations will be in place today due to strong winds," a Sydney Airport spokesperson said.

"As a result, there are some flight delays and cancellations.

"Airlines are working hard to re-accommodate passengers and get them on their way."

Passengers are encouraged to contact their airline if they have questions regarding the status of their flight.

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An Airservices Australia spokesperson said single runway operations were put in place at 7am "due to strong, gusty westerly winds" at the airport.

"This decision is purely weather and safety-related," the spokesperson said.

A Bureau of Meteorology spokesperson said westerly winds were forecast at Sydney Airport until early in the afternoon.

Westerly winds of about 37 km/h or more pose a hazard to aircraft on north-south runways due to strong cross winds, the spokesperson said.

June 30 is the last day of the school term in NSW and the ACT, while Victorian students are already a week into their winter break.