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

Both airlines are selling cheap fares on over 100 domestic routes, good for travel through the colder months of the year. Round-trip prices start at $108. These are the rules:

– You can fly now through February 12, 2014.

– Tuesday and Wednesday flights only.

– 14-day advance purchase required.

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

– No travel allowed November 26 & 27; December 3, 24, 25 & 31; and January 1.

– Book flights by 11:59pm PT September 12.

Check the AirTran and Southwest websites for full details of the respective sales, or use our airfare comparison tool to find the lowest prices.

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