Kimolos is where many travellers spend their quietest days in the western Cyclades: a small harbour at Psathi, the village of Chorio just above it, pale rocky coves and very few crowds. Heading to Paros brings you back to the heart of the island network, with its airport, daily ships to Piraeus and fast boats in every direction.
A direct crossing between the two is the part we cannot vouch for. Our route data lists Seajets on Kimolos to Paros as a seasonal service, while the record for the opposite direction names Blue Star Ferries as well, and there is no Ferryhopper route page or dated sailing to settle it. We have therefore left out the crossing time and fares in those records, which look generic rather than checked.
The good news is that Kimolos sits right next to two islands with regular Paros connections. Milos is the obvious one: Kimolos to Milos runs all year on Blue Star Ferries, with other lines and a summer Seajets hop, and Milos to Paros sails on 3 to 7 days a week in every month. Sifnos is the second option, 20 minutes to 1 hour from Kimolos, with Seajets and Blue Star sailing on to Paros.
Build the trip backwards from your Paros plans. If you have a flight or an onward ferry, arrive in Paros the day before, since you will usually be relying on two boats lining up. And if you are staying on Milos anyway, it may be simpler to leave from Adamas and visit Kimolos as a day trip.