In 2018 I took advantage of Frontier Airlines $80 round trip flights from Las Vegas to Miami for a trip to Key West. Sure they charge for seats and bags, but I traveled with only a backpack under seat carry-on and took a random seat assignment. The round trip ticket price was $80 all-in to fly to Florida for a vacation trip in January.
Frontier Airlines has a $79 round trip ticket for San Francisco to Miami with a couple of November departure dates, Nov 16 and 18, at the time of this post with more $39.50 one way dates for MIA to SFO.
Frontier Airlines  San Francisco SFO – Atlanta ATL – Miami MIA – ATL – SFO
$79.00 round trip  Sat Nov 16 – Fri Nov 22
![a screenshot of a flight schedule](https://loyaltytraveler.boardingarea.com/wp-content/uploads/2019/11/SFO-MIA-79-F9-Nov16-22.png)
![a screenshot of a phone](https://loyaltytraveler.boardingarea.com/wp-content/uploads/2019/11/MIA-SFO-2-40-Fri-Nov22.png)