There are
2,046 mi
from Vallejo, CA to Swansea, IL
That's the driving distance. It would take 1 day 11 hours to go from Vallejo, California to Swansea, Illinois.
The flight distance (direct flight from Vallejo, CA to Swansea, IL) is 1,740.40 mi.
2,046 mi = 3.22 kms