Spetses Island has no airport. All flights are first directed to the Athens international airport (Eleftherios Venizelos) and then through the port of Piraeus (reachable through taxi or bus directly from the airport). From the port of Piraeus daily high speed boats and flying dolphins leave and arrive after 2h and 30 minutes to the island of Spetses.
By land, through the Peloponnesus, it is 3 hours' drive from Athens to the small harbour of Costa and from Costa u can take water taxis that will reach Spetses' central harbour, Dapia, in 10 minutes. In Costa there are 2 big parking's where u can leave ur car wt safety(charges are by the day). These water taxis are available 24 hours per day. In addition traditional boats (kaiques) can take u from costa to Spetses' central harbour, Dapia between 5 to 15 minutes.