It currently takes 106 minutes on the fastest rail route to travel between the international airport in Chiba Prefecture and Haneda, which mostly serves domestic flights. The new subway would make it easier to change between domestic and international flights, it said.
The new subway extending for around 11 kilometers would link Oshiage and Sengakuji stations in Tokyo and cut the current 90.6-km route between the airports to about 84 km, the ministry said.
To make shinkansen bullet train services more accessible for air passengers, the Land, Infrastructure, Transport and Tourism Ministry is hoping to build a new station adjacent to Tokyo Station that would provide services for Narita in 37 minutes and Haneda in 22 minutes.
The ministry is planning to come up with the total cost of the project by the end of the current fiscal year next March, it said.