LaGuardia Airport is about to go from a state of disrepair to state-of-the-art.

The facility that Vice President Joe Biden famously dubbed “Third World” is going to be completely torn down and rebuilt as a single, sleek new building as part of a $4 billion project aimed at drastically reducing flight delays and getting the airport into the 21st century, officials announced Monday.

The extreme makeover will also add badly needed AirTrain and high-speed ferry service to the overcrowded, delay-riddled gateway to the Big Apple.

“This is what New Yorkers deserve and have deserved for a long time. And now we’re going to get it,” said Gov. Andrew Cuomo, who gleefully announced the plan alongside Biden and Port Authority officials.

“There is no way to fix this. We need to literally tear it down and rebuild it. It’s not a plan, not a sketch, not a dream, not a vision, it is actually happening. New York had an aggressive, can-do approach to big infrastructure in the past — and today, we’re moving forward with that attitude once again.”

Among the highlights:

A new, unified terminal that will be 600 feet closer to the Grand Central Parkway, providing 240 percent more space for runways and flight operations.

High-speed ferry service that will have boats docking at the existing Marine Terminal.

Passenger access to their gates via raised pedestrian bridges, high enough for aircraft to taxi underneath.

A state-of-the-art, post-9/11 security system that will be three times as large as the current operation, slashing wait times.

Nearby roads reconfigured to improve access for passengers and reduce traffic.

A new Central Hall with increased space for high-end amenities including retail shops and a 200-room boutique hotel.

An increase in passengers from roughly 27 million in 2014 to 35 million when it’s finished.

Creation of 8,000 construction jobs and 18,000 permanent jobs both at the airport and in businesses that service the airport. “Middle-class jobs. Jobs you can raise a family on,” Biden said.

The stunning new airport will be paid for by a private-public partnership, with the Port Authority kicking in roughly 50 percent.

Amazingly, nearly as many planes will be able to fly in and out of the airport during construction as there are now, according to Patrick Foye, executive director of the Port Authority of New York and New Jersey

“There are going to be times when flights have to be scaled back, but mostly it will continue to operate at its current level,” he said.

The new terminal will be built to better withstand storms like Hurricane Sandy, which swamped the airport with 100 million gallons of seawater and shut it down for two days.

In May, the PA selected a group led by Swedish construction company Skanska AB to help finance, build and manage the replacement.

Cuomo had asked three companies, Dattner Architects, PRESENT Architecture and SHoPArchitects, to submit design proposals — and all three won. Each will receive $250,000 for their ideas, because parts of each design were incorporated into the vision for the unified terminal structure.

The new LaGuardia is part of an ambitious plan aimed at four of the state’s airports in the greater New York area.

Stewart Airport in Orange County and Republic Airport on Long Island would both get Startup New York designation, allowing new and expanding businesses to operate tax-free for 10 years.

And Kennedy Airport would have its architecturally distinct Saarinen building reconfigured into a hotel.

Biden, Cuomo and other officials all ripped the current LaGuardia at the event in Manhattan.

“It’s slow, it’s dated, it has a terrible front-door entranceway to New York,” Cuomo said, calling it “un-New York.”

Additional reporting by Kirstan Conley in Albany