There are
199 mi
from Oshkosh, WI to Frankfort, IL
That's the driving distance. It would take 4 hours 5 mins to go from Oshkosh, Wisconsin to Frankfort, Illinois.
The flight distance (direct flight from Oshkosh, WI to Frankfort, IL) is 178.23 mi.
199 mi = 319.86 kms