The Nankai Electric Railway makes 4 round trips a day by Limited Express, and runs Express trains at about 30-min intervals between Osaka Namba Station and Koyasan Station. It takes 1 hr 40 min by Limited Express, and around 2 hours by Express. It takes about 2 hours from Wakayama as well.
Nankai Koyasan Station
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Search the Nankai Electric Railway's Timetable
From Osaka's Kawachi-nagano to Hashimoto via Rt 371. Hashimoto to Koyaguchi and Kudoyama via Rt 24. Kudoyama to Koyasan via Rt 370 & 480. It takes about 2 hours from Osaka, 5 hours from Nagoya.
497 Koyasan, Koya-cho