You can come to Kythera either by plane from Athens or by ship from Piraeus. You can also drive across Peloponnese and then come across from Gytheio or Neapolis by ship. During the summer months you can find flights from Thessaloniki and Seven Islands, too. There are ship itineraries from Crete, too.
For Schedules visit the link https://visitkythera.com/schedules/
For your air and ferry tickets visit the link: https://visitkythera.com/tickets/
Municipality of Kythera +30 2736031213
Police Station +30 2736031206
Hospital +30 2736033203
Port Authority of Diakofti +30 2736033280
Airport of Kythera +30 2736033297