When flying from Leeds to San Juan, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
For a flight from Leeds to San Juan, you will be flying from Leeds/Bradford. Leeds/Bradford (LBA) is just 6.5 mi from the center of the city. Leeds/Bradford is the only Leeds airport and it handles 0 outbound flights to San Juan per day. 0 airlines have flights to San Juan from Leeds/Bradford on a regular basis.