we are flying out March 16@ 6:15am with frontier and most of the park and fly hotel shuttles don't start until 5:00am. Is that enough time for us for a domestic flight to Arizona and the hotel states it is 1.5 miles from the airport?

Yes, that is plenty of time. Google won't tell you that answer though. Security at the airport is quick.

Frontier almost charges for even breathing so beware

That's tighter on time than I'd like to be.

Yes it is

Yes

Should be good . You can Google it to make sure