Ferries from Hydra to Ermioni can peak at up to 2 daily sailings, Sailing frequency typically peaks in the summer months, with approximately 8 departures offered each week. While schedules may be reduced from Hydra to Ermioni in other seasons, ferry services are often still available.

Ferry travel from Hydra to Ermioni on average typically takes 60m. The earliest ferry usually leaves from Hydra at 10:10, arriving to Ermioni at 10:30 The latest ferry departs at 22:00 and arrives at 22:35.