I’m off – across France? (2,6)
I believe the answer is:
au revoir
(Other definitions for au revoir that I've seen before include "See you soon, 'bye for now - in France" , "Bye-bye! (Fr.)" , "Farewell to the French" , "So long, see you soon - in France" , "So long, 'bye for now - in France" .)