There are many ways to reach Yokohama’s Chinatown.
We advise you to travel on the Seibu Ikebukuro, Tōbu Tōjō, and Fukutoshin lines (direct way), and from Shinjuku-Sanchome and Shibuya’s stations.
From Spring 2013 the Fukutoshin line is finally linked to the Tōbu Tōjō and Tōkyū Tōyoko Lines.
You also do not need to transfer on other lines to get to Minato Mirai Line’s last stop, Motomachi-Chūkagai Station.
From Yokohama station, the ticket costs about 200 yen and the journey takes about 10 minutes long.
You reach Chinatown by foot immediately out of Motomachi-Chūkagai station.
From Saitama, Kawaguchi cities (in Saitama prefecture) and from Ueno, Tōkyō, Shimbashi (in Tōkyō metropolitan area), travelling on the Keihin Tōhoku Line is comfortable. Trains running on this line pass through Yokohama station and take you to Ishikawa-chō Station. Once you exit the station you can take a short walk to Chinatown. However, they call at all stations on the way, so it could be a long journey. If you do not care transferring, then reach first JR Yokohama Station with the faster JR Tokyo Ueno Line (Tokaido Line thru service), and then change to the Keihin Tōhoku Line once in Yokohama, for three more stations.
If you are coming from Western Japan, once you got to Shin-Yokohama Station by Shinkansen you have to transfer on the Yokohama line, heading to Ishikawa-chō station like on route 2 (direct services available).
By plane, landing at Narita Airport, you can reach Yokohama on the convenient Narita Express in about 2 hours, or in about 2 hours and a half if you decide to travel on the Yokosuka Line: you’ll have to transfer at Yokohama Station for the Minato Mirai or Keihin Tōhoku lines.
If landing at Haneda International Airport, instead, actually it is way closer than Narita, and the Keikyu Line will take you to Yokohama Station with no changes (in certain hours you need, however, to transfer at Keikyu Kamata Station) in less than 30 minutes.