Ending today, Southwest Airlines via DealBase discounts Southwest Airlines 1-Way Fares Nationwide with prices starting at $40.98. (On the DealBase landing page, click on "Southwest Airlines" in the top line to see this sale.) That's $13 under our mention from three weeks ago and the lowest price we could find for select routes by $155. This price is valid on flights departing from New York, NY, (LGA) with arrival in Chicago, IL, (MDW) on January 6, 2016. Book this travel deal by today for travel from December 1, 2015 through May 25, 2016. Other notable fares:

• Chicago (MDW) to Indianapolis (IND) from $58.98
• Columbus (CMH) to Washington D.C. (DCA) from $58.98
• St. Louis (STL) to Nashville (BNA) from $68.98
• see all available Southwest Airlines fares

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