無事に帰国って英語でなんて言うの？

There are a few ways to say “帰国.” For example, you could say: …make it home …return home …make it back You can use any of the following to say “無事に帰国” — I hope you make it home safely. I hope you return home safely. I hope you make it back okay.

"Safe travels!" this is a very common phrase in the US. It means that whatever method the person is taking to get back home (plane, car, walk, etc) you hope it goes well and without problems. "Have a safe trip back!" this is a longer version of the phrase above. "Get home safe." this is a shortened version of "I hope you make it home safely" but still means the same thing.

"Mind how you go" is a native English phrase and in short means to be careful of any obstacles or obstructions that you may face on your journey. To 'mind' something literally means to take care of something e.g. a Childminder (Babysitter). It is a great phrase to use in conversation and it would surely bring a smile to any English person's face.

In context, it is sufficient to say, 'Stay safe!' as someone is departing. However, a more positive message may be simply: "Have a good journey!" Unless you are entering a war zone, there is really no need to refer to the 'safety' aspect in modern developed society.

Americans often just say, "Take care" which means the person speaking cares about them and worries about them in a nice way. "Have a safe trip" is used for longer journeys. If a person is just going home by car or MRT one just says "Take Care." That is very common in New York. "Please be careful" would be used by people in a close relationship, family, spouse, close friend, people like that.