Formal:
* ʻAʻole loa e lōʻihi (ʻaʻole lōʻihi) ka manawa e hiki ai au. (Literally: "The time to my arrival is not long.")
* E hiki koke mai ana au. (Literally: "I will arrive soon.")
Informal:
* E hiki aku ana au i ka wā koke. (Literally: "I will arrive in a little while.")
* E hele koke mai au. (Literally: "I will go soon.")
More casual:
* Ke hele nei au. (Literally: "I am going.") This implies you're on your way.
Note:
It's important to use the correct grammatical form and appropriate vocabulary depending on the context and the person you're speaking to.
You can also add a specific time frame like:
* Ma hope koke iho. (Soon after.)
* I loko o kekahi mau minuke. (Within a few minutes.)
* I ka pō nei. (Tonight.)
These examples give you a good starting point. Remember, the best way to express "be there soon" in Hawaiian is to consider the specific situation and choose the most appropriate phrase.