At the baggage claim area, take the subway train to downtown Chicago. Purchase a transfer. Exit the train at the State and Lake Street Station. Exit the train station and take a northbound bus on State Street to Grand Avenue. They will provide a van or bus that will drop you off at the hotel.
Discounts are available for round trip ticket purchase.
The cost and time may be increased at peak travel times and when roadway is congested. The Amtrak trains arrive and depart Union Station at 210 South Canal Street, about 13 blocks south and 9 blocks west of the Cass Hotel. Get off the bus at Michigan Avenue and Ontario Street. Turn right on Wabash Avenue and the Cass Hotel is on the left side of the street.