Southwest Airlines via DealBase discounts select Southwest Airlines 1-Way Fares Nationwide, with prices starting at $48.98. (On the DealBase landing page, click on "Southwest Airlines" in the top line to see this sale.) That's the lowest price we could find for select routes by at least $8. This price is valid for flights departing on March 13 from Cleveland, OH, (CLE), with arrival in Milwaukee, WI, (MKE).