Koyasu

Known weekday departures: 237/day · Known Sat & holiday departures: 3/day in the available timetable data

First / last known departure (weekday): 4:52 / 24:30 (00:30 next day)

Busiest hour (known departures): 8:00–9:00 (18)

0:00 ─ 23:00

Figures are the departures known from the timetable data, not a count of today's actual service.

Timetable data as of 5 May 2026 (retrieved in spring/summer 2026).

Weekday figures cover every line at this station. For Saturdays and holidays the timetable data is incomplete for some or all lines, so those figures are departures in the available timetable data, not totals.

Lines where the timetable data is incomplete:

• Keikyu Main Line: no Saturday, Sunday or holiday timetable

• Keikyu Main Line: Keikyu Shinkoyasu ⇄ Kanagawa-shimmachi

Koyasu Station opened on 24 December 1905 on the Keikyū Main Line, and was rebuilt with passing-loop tracks in March 1952 to give two island platforms serving four tracks. Limited-express calls were transferred to the next station, Kanagawa-Shimmachi, on 21 February 1965, demoting Koyasu first to express stops and then, after the 31 July 1999 timetable revision discontinued express runs south of Keikyū Kamata, to local trains only. The station building and the platforms are linked by an underground passage; elevators were added in 2007, and these are connected to the station building by a newly built overpass rather than by that passage. Keikyū introduced station numbering on 21 October 2010, assigning station number KK33. The station sits on a stretch of complex double-single line where the inbound side has two parallel tracks between Koyasu and Kanagawa-Shimmachi.

When Keikyū renamed ten stations from "Keihin" to "Keikyū" on 1 June 1987, this stop kept its short name Koyasu; the road junction outside still carries the old company prefix on its sign as "Keihin Koyasu Station Entrance."