Dodekanisos Seaways have published their summer 2022 timetable, and even opened bookings right up to the end of October. However with COVID-19 still behaving unpredictably there’s no guarantee the services will operate as advertised, they certainly didn’t in 2020 or 2021.
I’d avoid booking this early, if you are one of those who feel they absolutely must have every loose end tied up, book directly with Dodekanisos Seaways, or use a reputable travel agency (such as Symi Tours – other Symi-based agencies such as Lakis Travel or Panormitis Travel are available). If you choose an on-line only booking agency, and the timetable changes due to unforeseen circumstances, you may find difficulties in contacting them and getting your booking altered, and this or refunds may be a chargeable service.
Blue Star Ferries have their all-year-round Wednesday and Friday calls at Symi throughout the summer, and this increases between mid-June and mid-September with ships calling on Mondays and Tuesdays too. Booking advice is the same for Blue Star.
Once SAOS Ferries qnd ANES Ferries release their summer timetables I’ll be able to produce a summary timetable.