We are booked for a June Eastern European tour. I had originally intended to take a return flight from Ljubljana at 12:30 which would get me back to Boston at 18:30 and then be able to take the last available train home from there arriving about 23:00. If we choose a 07:00 departure I can be in Boston at 14:30 and have a choice of a few different train departures. For those who have done it, how difficult is it getting up at 3:00 or 4:00 in the morning to get to the airport and how easily is this coordinated? The answers to an earlier question piqued my interest in possibly trying the earlier flight home.
The only issue I've ever had with an early morning departure like that is your use of public transportation to the sirport may be resticted; you may need to leave for the airport before the trams start running. Of course, you can always take a taxi; it just adds somewhat to the cost.
See my reply to your other post - plenty of other tourmates will have equally early flights. There were no problems having the guide arrange early shuttle vans.
I go to Europe every summer for a month and while there take a RS tour. One year, we were cutting our vacation time REAL short so to make it home when we need to, we took a 0700 flight out of our tour ending city. We did that ONCE. We have never done that again and since then take a flight that departs at noon if it is non-stop from where we are, or, take a noon flight to the city we need to get to to fly back to Seattle non-stop. We spend the night there and are ready for morning flights home. Much more relaxing way to end a European vacation.