Formal:
* Lo siento: This is the most common and formal way to say "I'm sorry."
* Le pido disculpas: This is a more formal and polite way to say "I apologize."
Informal:
* Perdón: This is the most common and informal way to say "sorry."
* Disculpa: This is another informal way to say "excuse me" or "sorry" and can be used in a variety of situations.
* Disculpame: This is a slightly more formal way to say "excuse me."
Other options:
* No te preocupes: This means "Don't worry" and can be used to apologize for something minor.
* Te pido perdón: This is a more formal way to say "I apologize."
The best way to say "I'm sorry" in Cuban Spanish will depend on the situation and your relationship with the person you are speaking to.