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American and United Airlines have round trip airfares travelling to and from Louisville KY (SDF) and Chicago (ORD) for $ 99, nonstop. On American, the fares are main cabin, regular economy fares. On United Airlines, they are basic economy (no carry-on bag).

Travel Availability:

Departs SDF: March 16-20, 22-27, 29-31; April 1, 3, 5-8, 10, 12-15, 17, 19-22, 24, 26-29; May 1, 4-6, 8, 10-13, 15, 17-20, 22, 24-26
Departs ORD: March 16-17, 20, 22-25, 27, 29-31; April 1, 3, 5-8, 10, 12-15, 17, 19-22, 24, 26-28; May 1, 3-6, 8, 10-13, 15, 17-20, 22, 24-26