Update: this popular deal may have sold out. See more deals >

Southwest has posted its second fare sale in as many weeks, cutting prices on every route and letting you fly through winter and spring. The sale is valid until midnight Thursday. These are the rules:

– You can fly January 25 through May 21.

– No Friday or Sunday flights.

– No travel on February 17.

– 14-day advance purchase required.

– Sale fares are one-way only; round-trip purchase not required.

– Book flights by 11:59pm local time January 20.

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