A random search shows: OPTION 1: 23hr 15min
SIN - IAD United Airlines Flt 0804 Dep 07:10am 29May,Fri
IAD - PHL United Airlines Flt 7933 Dep 05:19pm 29May,Fri
Flight Duration: 21hr 31min; Layover Time: 1hr 44min; Total Trip Time: 23hr 15min
To Fly from singapore to kathmandu it would take about 5-6 hours.
how long does it take to fly from osan korea to philadelphia
it depends.
14hours
If you fly direct it would take about 11 hours.
Fm Singapore to Penang - a mere hour.
10000 years
99 hours
with in 3hrs
8h
It would take 4 hours.
It would take 18 hours.