Casual:
* Adiós: This is the most common and versatile way to say goodbye.
* Chao: This is a more informal and friendly version of "adiós".
* Hasta luego: This means "see you later" and is suitable for situations where you expect to see the person again soon.
* Hasta pronto: Similar to "hasta luego", but implies a longer period before seeing the person again.
* Nos vemos: This means "we'll see each other" and is used for friends and people you know well.
* Cuídate: This means "take care" and is a friendly way to say goodbye.
* Que te vaya bien: This means "have a good day" and is a polite way to say goodbye.
Formal:
* Hasta la vista: This is a more formal way to say "see you later".
* Hasta mañana: This means "until tomorrow" and is used in situations where you will see the person again the next day.
* Buen viaje: This means "have a good trip" and is used when someone is leaving for a journey.
* Que le vaya bien: This means "have a good day" and is a polite way to say goodbye in a formal setting.
Other options:
* Despedida: This is the formal word for "farewell".
* Hasta siempre: This means "farewell forever" and is used in very formal situations or when saying goodbye to someone permanently.
Note: The appropriate way to say goodbye depends on the context and your relationship with the person.