American Airlines have round trip airfares travelling to and from Seattle (SEA) and Chicago (ORD) for $ 75, nonstop. These are basic economy fares, a restricted-type fare.

Travel Availability:

Departs SEA: Aug 4-6, 10-31; Sept 1-2, 9-30; Oct 3, 6-7, 10, 12-14, 16-17, 19-24, 26-27, 30-31; Nov 2-5, 7, 9-14, 16-18,
Departs ORD: Aug 5-6, 10, 11-31; Sept 1-2, 9-30; Oct 6-8, 10, 13-17, 20-25, 27-31; Nov 205, 7, 10-14, 17-18;