Ending today, Southwest Airlines via DealBase discounts Southwest Airlines 1-Way Fares Nationwide with prices starting at $39.98. (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 $19. This price is valid for flights departing on January 16, 2018, from Atlanta, GA, (ATL), with arrival in Chicago, IL, (ORD). Note that blackout dates and other conditions may apply. Book this travel deal today for travel from January 9, 2018, through May 17, 2018.

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