Ferries from Mariehamn to Tallinn 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 Mariehamn to Tallinn in other seasons, ferry services are often still available.

Ferry travel from Mariehamn to Tallinn on average typically takes 12h 25m. The earliest ferry usually leaves from Mariehamn at 04:20, arriving to Tallinn at 10:45 The latest ferry departs at 22:55 and arrives at 13:15(+1).