Can I have the bill
me pweðe tɾaeɾ la kwɛnta
In Spanish ¿Me puede traer la cuenta?
It's polite to use 'usted' (formal 'you') when addressing a waiter or waitress, especially in Spain.
Example
"After finishing your meal, you can say, "¿Me puede traer la cuenta, por favor?" (Can you bring me the bill, please?)"