Ferry from Aberdeen (mainland Scotland) to Kirkwall (Orkney)
The ferry from Aberdeen to Kirkwall connects the mainland of Scotland to Orkney. It is operated by Isle of North Link Ferries. The sailing happens on the vessels MV Hrossey and MV Hjaltland. Sailings occur four times a week, with a crossing time of 6 hours.
Aberdeen to Kirkwall
In addition to the MV Hamnavoe you can sail to Orkney from Aberdeen via the MV Hrossey and MV Hjaltland. These are the same ferries which sail directly to Shetland. But on certain days of the week they sail indirectly and stop at Hatston (outside Kirkwall) in the Orkney Islands. Departing Aberdeen at 1700 they stop in Hatston at 2300, before continuing northwards to Shetland again at 2345.
The ferry travels from Aberdeen to Kirkwall (and then from Kirkwall to Lerwick) on a Tuesday (not in winter), Thursday, Saturday and Sunday night.
The ferry sails from Lerwick to Kirkwall (and then from Kirkwall to Aberdeen) on a Monday (not in winter), Wednesday, and Friday night.
If you were interested in visiting both island groups then perhaps travelling from Aberdeen to Lerwick, then Lerwick to Hatston, and finally Stromness to Scrabster, may be a great way to see everything!