Ferries from Oscarsborg vestre kai

The western quay of the fortress island runs a different service from the eastern one: 5 to 6 sailings a week to Drøbak, 1.1 nautical miles away at 6 to 7 minutes, and the same to Håøya at 2.0 nautical miles in 8 to 9.

Everything works between 10:08 and 18:48 under three day patterns — a daytime service with nothing early and nothing late.

Håøya is the large wooded island north of the fortress, a recreation area with campsites and no permanent population. Ruter operates these boats as part of the Oslo network, distinct from the Forsvarsbygg ferry that serves the fortress itself from the eastern quay. One island, two quays, two operators and two entirely different timetables.