Formal:
* "Eh bien, je dois y aller." (This is the most literal translation and is appropriate for formal situations.)
Informal:
* "Bon, je dois y aller." (This is a more casual version of the formal expression.)
* "Je dois y aller." (This is very casual and simply means "I have to go.")
* "Je dois partir." (This also means "I have to leave.")
Other options:
* "J'y vais." (This means "I'm going" and is used when you're already on your way out.)
* "À plus tard." (This means "See you later" and can be used as a way to say goodbye.)
The best option will depend on the specific context and your relationship with the person you are talking to.