Where do I look to find out if this bus runs from the port to the square on that day and the times that it runs that day. We have to be in square by 8:45 am to catch our tour . Thanks so much for your help in advance
The X80 bus Piraeus cruise port ↔ Syntagma square operates from may to october everydays from 7am to 9:30pm
See below the details about the X80 bus:
https://www.oasa.gr/en/visit-athens/x80-piraeus-acropolis-syntagma-express-bus-line/
You can download the map below showing the X80 route (thin black line) The cruise port is at the bottom left of the map.