Καλό ταξίδι - Καλό δρóμο - Καλή συνέχεια: Have a good journey!

They used to say Καλό ταξίδι - Have a good journey!

Now you hear more often the phrases Καλό δρóμο or Καλή συνέχεια (Have a good road, have a good continuation of your journey).

These days, Καλό ταξίδι seems to be used more often in the sense of "Have a good journey" -addressed as a farewell to the recently deceased, i.e. Καλή αντάμωση - ΣΤΟΝ ΑΛΛΟ ΚΟΣΜΟ ..."To a happy reunion", or "Until we meet again, in the other world", 

It's also a little easier to spell than συλλυπητήρια (condolences).