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

Southwest has posted a new domestic fare sale that sees prices down on over 50 domestic routes. Advertised fares start at $138 round-trip.

These are the rules:

– You can fly September 16 through March 4.

– No travel November 25-26.

– Tuesday and Wednesday flights only.

– 14-day advance purchase required.

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

– The offer is valid until 11:59pm September 18.

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