American / United Airlines offer round trip non stop fares from Houston(IAH) to Miami (MIA) for $97
This is a BE fare and has restrictions.
Sample Dates (Jan-Mar)
Depart IAH Jan 27,28 — Depart MIA Jan 31, Feb 1
Depart IAH Feb 1,2,3,23,24 — Depart MIA Feb 5,6,7,27,28
Depart IAH Mar 1,3,23,24 — Depart MIA Mar 5,7,24,28
https://www.skyscanner.