ShermansTravel offers American Airlines roundtrip flights to or from Chicago with prices starting at $138.80. (Click on "AmericanAirlines.com" in the main paragraph to see this sale; all taxes are included.) This price is valid on flights departing from Chicago, IL, (ORD) to Milwaukee, WI, (MKE) on April 10 with return on April 15; prices vary depending on the travel cities and dates chosen. (All taxes and fees are included.) That's the lowest current base rate we could find for select routes by $11. Book by March 11 for travel April 8 through June 13.