The trip from Forest Park to O'Hare on Chicago L takes about 103 min, with no transfers.
Step by step
Blue Line
Board at Forest Park on Blue Line towards O'Hare, and get off at O'Hare (32 stops).
Forest Park → Harlem → Oak Park → Austin → Cicero → Pulaski → Kedzie-Homan → Western → Illinois Medical District → Racine → UIC-Halsted → Clinton → LaSalle → Jackson (Blue Line) → Monroe (Blue Line) → Washington → Clark/Lake → Grand → Chicago → Division → Damen → Western → California → Logan Square → Belmont → Addison → Irving Park → Montrose → Jefferson Park → Harlem → Cumberland → Rosemont → O'Hare
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