Flight George Bush Intercontinental Airport departs from Houston George Bush Intercontinental Airport at 23:44 and arrives at San Juan Luis Munoz Marin International Airport at 05:15.
The flighttime is about 4h 31m. The distance travelled ("as the bird flies"): 3252 Km. So the average speed is roughly 720 Km.
There is an 1 hour time difference between Houston and San Juan