Flight Narita International Airport departs from Tokyo Narita International Airport at 11:00 and arrives at Hagatna Antonio B. Won Pat International Airport at 15:45.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 2023 Km. So the average speed is roughly 539 Km.
There is an 1 hour time difference between Tokyo and Hagatna