Flight La Guardia Airport departs from New York La Guardia Airport at 10:20 and arrives at Phoenix Sky Harbor International Airport at 15:38.The flight has a short stop at Houston.
The flighttime is about 8h 18m. The distance travelled ("as the bird flies"): 4232 Km. So the average speed is roughly 510 Km.
There is an 3 hour time difference between New York and Phoenix