Southwest Airlines via DealBase discounts Southwest Airlines 1-Way Fares Nationwide with prices starting at $41.98. (On the DealBase landing page, click on "Southwest Airlines" in the top line to see this sale; we found this price on flights from Atlanta, GA (ATL), to Chicago, IL (MDW), on September 9.) That's the lowest price we could find for select routes today by at least $18. Note that blackout dates and other conditions may apply. Book this travel deal by August 24 for travel from September 5 through March 1, 2018.

All prices, dates, and booking details were valid at the time of publication.