100+ routes on sale with Southwest — book by Thursday

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

Southwest has just cut prices across its entire route network, and the sale fares are good for travel right through winter and spring. You can get a round-trip flight from $138, but you have to book by midnight Thursday. These are the rules:

– You can fly January 18 through May 21.

– Tuesday and Wednesday flights only.

– 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 9.

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