Formal:
* Karibu tena: This is the most common and literal translation, meaning "Welcome again."
* Karibu nyumbani: This means "Welcome home" and is a good option if the person has been away for a while.
Informal:
* Umetulia? This means "Are you settled?" and is a casual way to say "Welcome back."
* Umerudi salama? This means "Did you return safely?" and is a good option if the person has been on a trip.
You can also add a personal touch to your welcome by saying something like:
* Nimefurahi kukukuta tena: This means "I am happy to see you again."
* Tumekukosa sana: This means "We missed you very much."
The best way to say "Welcome Back" in Swahili will depend on your relationship with the person you are greeting.