The cost of overhauling JFK Airport has shot up 30 percent in a year, Gov. Cuomo announced Thursday.

Speaking before the Association for a Better New York, the governor put the latest price tag for the massive project at $13 billion — with $12 billion coming from the airlines and $1 billion from the Port Authority.

In January 2017, an advisory panel appointed by Cuomo estimated the cost at $10 billion.

Officials said the higher figure is the result of the private sector investing more and footing 90 percent of the bill — and not due to inflated costs.

Despite the higher spending, the plan does not include a new runway to handle additional air traffic, which PA officials said was unnecessary at this time.

A report by the Regional Plan Association predicts JFK, which currently has four runways, will need two additional runways to handle growth over the next 20 to 25 years.

The airport is ranked 69th out of 100 by global travelers, PA executive director Rick Cotton said in justifying the sweeping changes planned for a facility that opened in 1948.

Cuomo said the upgrades — to be completed in 2025 — are long overdue.

“In my home, when the call went out, you have to pick someone up at JFK, it was drawing up the short straw. That was torture,” said Cuomo, who grew up in Queens.

The renovation plan calls for combining a hodgepodge of eight terminals into two mega-facilities that connect nearly all the airlines.

Jet Blue will anchor one 1.2 million-square-foot north side terminal. A consortium of four international airlines — Lufthansa, Air France, Japan Airlines and Korean Air Lines — will develop another 2.9 million-square-foot south side terminal.

The fate of Terminal 8, now occupied by American Airlines, remains under negotiation.

Under the plan, the number and size of airport gates will be increased while taxiway improvements will allow for larger planes and reduce gate congestion.

Roads inside the airport hub and on the perpetually clogged Van Wyck Expressway and Kew Gardens Interchange will also be upgraded.

The RPA called the plan a good start and said JFK would be able to finance additional runways “as passenger volumes grow as a result of these investments.”