bon voyage; have a safe trip
A polite, somewhat formal farewell used when someone is departing on a journey. Often used in writing or in formal spoken contexts. Compare with よい旅を, which is slightly less formal.
See also: 良い旅を
Have a safe journey. Bon voyage.
Dear guest, please have a safe trip.
More casual and commonly used in everyday conversation. 道中ご無事に is more formal and often used in written or ceremonial contexts.
A fixed phrase composed of 道中 (journey), ご (honorific prefix), 無事 (safety), and に (adverbial particle), literally meaning 'safely on your journey'.