旅途平安 [lǚ tú píng ān]
have a safe trip Other than the related answers listed below, you can also use this Chinese proverb: 一路顺风 yi(1) lu(4) shun(4) feng(1) --> have a smooth journey
boa viagem
Turvallista matkaa!
"Bezpiecznej podróży!"
旅行怎么样
khair nal jao
"Želáme Vám bezpečnú cestu"
ασφαλές ταξίδι [asfales taxeethi]
eka suraksita yatra hai
旅途愉快/Lǚtú yúkuài
The Chinese translation of have a nice trip in Chinese is simply have a nice trip. This statement is usually said to the people who are travelling.
Have a safe journey = heb een veilige reis