Formal:
* A hui hou: This literally means "until we meet again" and is a common farewell.
* Aloha ʻoe: This means "farewell to thee" and is a very formal and poetic way to say goodbye.
Informal:
* E ʻoluʻolu e hoʻi mai: This means "please come back" and is a friendly way to express hope for a future meeting.
* Ke kali nei au iā ʻoe: This means "I am waiting for you" and implies an anticipation of seeing the person again.
Other options:
* Ke aloha nei au iā ʻoe: This means "I love you" and can be used to express a strong desire to see the person again.
* Maikaʻi, e hoʻi mai: This means "okay, come back" and is a casual way to say goodbye.
Ultimately, the best way to say "until we meet again" in Hawaiian will depend on the context and your relationship with the person you are speaking to.