Directions from sweden
You can either take Eckerölinjen (c. 2 hours) from Grisslehamn or Viking Line (c. 2 hours) from Kapellskär to Åland. Then drive to Hummelvik in Vårdö. From there you take the ferry (c. 2 hours) to Lappo. In Lappo you change ferries (c. 10 min) which takes you to Asterholma.