Suggested Flight routings:

From DCA: Northwest or US Airways to IND.  Last flights home leave IND at 7pm (6pm Central).

From BWI: Southwest to MDW, or American/Northwest to CMI.  Last flights home leave CMI at 5:50pm, MDW at 8:30pm.

From SFO: Multiple airlines to ORD, or American to CMI.  Last flights home leave CMI at 4:15pm, ORD around 6:30pm.

From OAK: Southwest to MDW.  Last flight home leaves MDW at 7:25pm.

From LAX: Multiple airlines to ORD/MDW, or American to CMI.  Last flights home leave CMI at 4:15pm, ORD around 8pm.

From LAS: Multiple airlines to ORD/MDW, or American to CMI.  Last flights home leave CMI at 4:15pm, ORD around 8pm.