There are
2,098 mi
from Markham, IL to Vallejo, CA
That's the driving distance. It would take 1 day 12 hours to go from Markham, Illinois to Vallejo, California.
The flight distance (direct flight from Markham, IL to Vallejo, CA) is 1,836.74 mi.
2,098 mi = 3,377.14 kms