LaQuinta Inn & Suites
7255 W. 183rd Street
Tinley Park, IL 60477
Phone: 708-633-1200
Comfort Suites
18400 Spring Creek Dr.
Tinley Park, IL 60477
Phone: 708.342.1425
The Fairfield Inn
18511 North Creek Drive
Tinley Park, IL 60477
Phone: 708.633.1050
Holiday Inn Select
18501 S. Harlem Ave.
Tinley Park, IL 60477
Phone: 708.444.1100
There are several mid-range hotels in Tinley Park. In addition to those mentioned earlier, there's a Sleep Inn that is quite good. To get from O'Hare to Tinley Park by car, take the Tri-State down to I-80. By transit, take the 'L' from O'Hare to Clinton (past downtown, the last stop in the subway). Walk north on Clinton about two blocks to Union Station. Then take Metra's Rock Island line to either Tinley Park or (more likely) 80th Avenue. You will likely have to connect with either a bus or a cab to get to the hotel or ampitheatre.
Try the La Quinta in Tinley Park. Rooms available from $77 per night.
Try www.kayak.com