Flight La Guardia Airport departs from New York La Guardia Airport at 16:59 and arrives at Phoenix Sky Harbor International Airport at 21:55.The flight has a short stop at Chicago.
The flighttime is about 7h 56m. The distance travelled ("as the bird flies"): 4232 Km. So the average speed is roughly 533 Km.
There is an 3 hour time difference between New York and Phoenix