Transportation to and from Chicago O'Hare Airport or Midway Airport is available by limousine, taxi or car rental. There is no public transportation to Fermilab. Additional Information can be found in Fermilab Visit / Transportation
All of the rental companies (Alamo, Avis, Budget, Dollar, Enterprise, Hertz, National ) are located at the airports.
Find Metra Station near Fermilab from BNSF Railway / Union Pacific West line