American Airlines has Las Vegas to Miami route on sale for $96.10 each way for departure dates from February to early May. This fare is available every day of the week, for some weeks, for the Miami departure and every day, except Sundays for Las Vegas departures. There are at least ten $96 fare departure dates from Las Vegas in each month February, March and April and a few dates in early May. Even more low fare departure dates each month are available from Miami.
Low priced flights from Las Vegas are primarily red-eye overnight flights, while Miami departures are in the evening and reach Las Vegas between 11pm and 1am.
Frontier Airlines has lower fares at $82 each way for daytime travel from Miami, but to Miami is still a redeye.
American Airlines Las Vegas LAS – Miami MIA nonstop flights
$196.20 Saturday, February 27 – Friday, March 4