Western Sydney International Airport opening date announced

A Gold Coast flight will be the first available to passengers at Western Sydney International Airport. (Supplied)

Western Sydney International Airport will welcome its first passengers on October 25.

Jetstar will operate the airport's first commercial passenger flight with an Airbus A320 jetting off to the Gold Coast.

A metro line was supposed to open at the same time as the airport, but NSW Premier Chris Minns has said it could be delayed until 2028.

An opening date for passengers at Western Sydney International Airport (WSI) has been confirmed.

After 15 years of planning, seven years of construction and a year of testing, passengers will first get the chance to fly from the airport on October 25.

Jetstar will operate the airport's first commercial passenger flight with an Airbus A320 set to jet off to the Gold Coast at 11am.

The airport will open to passengers on October 25. (ABC News: Liam Patrick)

The brand new full-service airport will begin freight operations on July 26, with Qantas Freight to begin regular flights to and from WSI on July 27.

From November 1, WSI is expected to take advantage of not being subject to the 11pm–6am curfew that Sydney Airport at Mascot remains under.

The domestic and international terminal at Badgerys Creek, located 44 kilometres west of Sydney's CBD, is expected to serve up to 10 million passengers annually.

The brand new airport will deliver international, domestic and freight services. (ABC News: Liam Patrick)

So far only four airlines have announced their plans to operate out of WSI — Jetstar, Qantas, Singapore Airlines and Air New Zealand.

From launch, Jetstar will operate up to 14 flights a week between WSI and Melbourne, four weekly flights to the Gold Coast and three weekly flights to Brisbane.

Qantas will commence services from WSI on March 28, operating four flights per week to Brisbane and Melbourne.

Jetstar and Qantas will be offering domestic flights at WSI. (ABC News: John Gunn)

Daily flights to Changi via Singapore Airlines will start on November 23 and Air New Zealand will commence flights to Auckland on October 26.

Over 50 airlines fly in and out of Sydney Airport in Mascot, the vast majority being overseas carriers.

But with Western Sydney now Australia's third-largest economy and home to half of the city's population, Prime Minister Anthony Albanese said "it wasn't a matter of if Sydney needed a new airport, but when".

"Fifteen years later this new airport is almost ready to open," he said.

"I want to thank the tens of thousands of people who over the years planned, built and are