Ferries from Ermioni to Hydra can peak at up to 2 daily sailings, Sailing frequency typically peaks in the summer months, with approximately 7 departures offered each week. While schedules may be reduced from Ermioni to Hydra in other seasons, ferry services are often still available.

Ferry travel from Ermioni to Hydra on average typically takes 30m. The earliest ferry usually leaves from Ermioni at 06:50, arriving to Hydra at 07:10 The latest ferry departs at 17:20 and arrives at 17:45.