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Southwest Airlines via DealBase discounts select nationwide 1-way fares, with prices starting from $44.98. That's the best price we could find for select routes on comparable carriers by $4. Book this travel deal by August 15 for travel from September 3 through December 18. Buy Now Tips On the DealBase landing page, click on "Southwest Airlines" in the top line to see this sale; we found lower fares within. We found this price on flights departing on November 10 from Long Beach, CA (LGB) to Las Vegas, NV (LAS). All prices, dates, and booking details were valid at the time of publication.