Airport Rafina shuttle bus
In the summer months it is recommended to take the ferry from Rafina instead of Pireaus. These ferries only operate during the summer months. The port of Rafina is much nearer than Pireaus and is located north of the airport.
The Airport Rafina shuttle bus route goes partly over the airport grounds and needs only 20 minutes. Much faster than the taxi. The Airport Rafina Shuttle Bus stop is located almost below the transition from the airport to the train.
But beware, there are a few sites on the internet that show outdated timetables to the Airport Rafina shuttle bus. The official Airport Rafina Shuttle Bus schedule is here: