Travel
Above is the hotel list that was recommend by the wedding planner. There are plenty of condos you can rent as well. There are also lots of other hotels on the island if these options do not best fit you.
For flights, look at Allegiant airlines. They are the cheapest when flying directly to Key West. Another option is to fly into Miami and take the bus down. The bus is $39 round trip.
https://www.miamitokeywestshuttle.com/https://www.checkmybus.com/key-west-fl/miami-fl-airport