FOLLOWING on from lengthy airport delays experienced over the weekend in Sydney due to wild weather, passengers are being warned to expect even more chaos if they're heading to the international terminal today.

Thousands of angry passengers are facing major delays at Sydney Airport's international terminal after a mass Australian Border Force security outage.

Reports passport control machines are down in Sydney, with thousands of passengers experiencing massive queues at the departure gate.

One passenger told news.com.au that the electronic system at border control is down, meaning passengers are being processed manually at the security gate resulting in the massive queues.

Angry passengers have taken to social media to vent their frustration over delays.

"This is absolutely crazy! I've never seen a line like this in my life!" one person said on Twitter.

On Saturday, "hundreds of flights" in and out of Sydney's domestic airport were cancelled due to the wild weather and winds that lashed the state.

Jetstar, Qantas, Tigerair, Virgin and Rex were all forced to cancel numerous scheduled flights out of Sydney, leaving many customers unhappy and waiting hours for another flight.

The airport had a single runway open, as gales of up to 70km/hour lashed the airport.

News.com.au has contacted the Australian Border Force for comment.

More to come