Two hours
Manchester-London-Athens-Santorini: approx. 7 h with Aegean Airlines and Olympic Air.
Fort Lauderdale-New York-Athens-Santorini: approx. 20 hours with Continental Airlines, United Airlines and Olympic Air or Aegean Airlines
Philadelphia-Paris-Athens-Santorini: approx. 17 hours with Air France and Olympic Air.
approx. 5 hours
Pittsburgh-Paris-Athens-Santorini: approx. 18 hours with Air France and Aegean Airlines.
Approx. 5 hours with a high speed vessel from Hellenic Seaways.
Approx. 2 700 km.
From North London, about 2 hours. From South London, over 3 hours.
Rome-Athens-Santorini: 5 h 50' with Olympic Air
Aqpprox. 2 hours
There are no direct flights from Dublin to Sardinia. So the journey takes more than one flight. The flying time would be about 3 hours, but there could be a time between the flights which makes the total journey time longer. So it will depend on what combination of flights you get. You would easily make the full journey on the same day.