Thanks everyone! We won't take the metro on this trip, but if I go back we'll keep that as our plan.
Yes, Chani, this is the trip with dear old almost 92 year old dad, so we will take a taxi. I just got an email from our hotel, Herodion Hotel Athens, asking if we wanted a transfer to the airport. Our trip isn't until July/Aug so I have plenty of time. I was reading that a taxi is about 38 Euro and the hotel is offering 43 Euro for three people. Our flight doesn't leave until 12:15 and goes to Newark, then 3 hours later onto DC.
I am always the one who gets to the airport a full 3 hours in advance just to sit a long time and watch all the people on my flight arrive much later. So, I was thinking maybe if we left at around 9am from our hotel that might be fine? But, I don't want assume the ride will go off without a hitch, or that we might get stuck in traffic, but it would be nice to have a leisurely morning before our long flight home.
Any suggestion on booking ahead with the hotel or just call a taxi that morning?