Yokohama is the capital city in Kanagawa Prefecture which will host the Rugby World Cup in 2019. The city is only about 20 minutes away from Tokyo by Shinkansen, which happens to be the easiest way to get there. From Osaka in Kansai region, it takes about 2 hours by the bullet train. Regardless of direction, Yokohama is easily accessible.
18 Minutes from Tokyo Station to ShinYokohama Station
Take the JR Tokaido Shinkansen directly to Shin-Yokohama station for about 18 minutes, covered by Japan Rail Pass.
If you’d prefer the local more budget-friendly local line over the Shinkansen, take the JR Tokaido line to Kawasaki station from Tokyo and change trains there to get to Higashi-Kanagawa station via JR Keihin-Tohoku line. Finally. take the JR Yokohama line to Shin-Yokohama station. This journey takes about 36 minutes and costs ¥550.
2 Hours from Shin-Osaka Station to ShinYokohama Station
Take the JR Tokaido Shinkansen directly to Shin-Yokohama station for about 2 hours, covered by Japan Rail Pass.
Note that Japan Rail Pass cannot be used for travel on Nozomi trains on the Tokaido. However, both Hikari and Kodama trains are valid for with the Japan Rail Pass. If you take Hikari, this journey will be about 2 hours 10 minutes.
・From Sapporo City (New Chitose Airport)：About 1.5 hours by plane via Tokyo Haneda Airport
・From Iwate Prefecture, Kamaishi City：About 5 hours by train
・From Saitama Prefecture, Kumagaya City：About 1 hour 30 minutes by train
・From Shizuoka Prefecture：About 1 hour 20 minutes by train
・From Aichi Prefecture, Toyota City：About 3 hours by train
・From Kobe City：About 3 hours by train or about 1 hour 10 minutes by plane via Tokyo Haneda Airport
・From Fukuoka Prefecture, Fukuoka City (Fukuoka Airport)：About 1 hour 40 minutes by plane via Tokyo Haneda Airport or about 4 hours 50 minutes by train
・From Kumamoto Prefecture, Kumamoto City：About 1 hour 55 minutes by plane via Tokyo Haneda Airport or about 5 hours 25 minutes by train
・From Oita Prefecture：About 1 hour 40 minutes by plane via Tokyo Haneda Airport and Fukuoka Airport