There are
1,656 mi
from Nampa, ID to Swansea, IL
That's the driving distance. It would take 1 day 4 hours to go from Nampa, Idaho to Swansea, Illinois.
The flight distance (direct flight from Nampa, ID to Swansea, IL) is 1,420.82 mi.
1,656 mi = 1.61 kms