Southwest Airlines via Dealbase offers 1-way nationwide fares, with prices starting from $44.98. That's the lowest price we could find for select routes by at least $42. Book this travel deal by August 15 for travel from September 3 through December 18. Buy Now Tips On the DealBase landing page, click "Southwest Airlines" in the top line to see this sale; we found lower prices within. We found this price on flights departing from Las Vegas, NV (LAS) with arrival in Long Beach, CA (LGB) on September 10. All prices, dates, and booking details were valid at the time of publication.