Is there a ferry to the Cíes Islands from Cambados?
No.
There is no line to the Cíes Islands from Cambados. Cambados sits on the ría de Arousa, further north: its boats work that ría and do not come down to the Cíes.
The nearest port that works
From Cambados, the practical move is to head to Sanxenxo and board there: €32.50 per ticket and 1 departure a day in high season.
11:15
If you want more flexibility, Vigo runs up to ten daily departures in summer and is the cheapest port.