There are
1,467 mi
from Markham, IL to Mcallen, TX
That's the driving distance. It would take 1 day 1 hour to go from Markham, Illinois to Mcallen, Texas.
The flight distance (direct flight from Markham, IL to Mcallen, TX) is 1,220.76 mi.
1,467 mi = 2,360.95 kms