When flying from Fort Lauderdale to Cody, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Fort Lauderdale Airport to Cody E.E. Faust Airport flight would often be abbreviated as a FLL to COD flight.