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.) That's the lowest price we could find for select routes today by at least $4. Note that blackout dates and other conditions may apply. Book this travel deal by August 17 for travel from August 29 through March 1, 2018.

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