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

If you book before midnight Thursday, both AirTran and Southwest are offering hundreds of discounted flights. Fares start at $138 round-trip, subject to the following rules:

– You can fly between January 7 and May 15 next year.

– Cheap flights are available all days except Sunday.

– Sale prices are one-way only; a round-trip purchase is not required.

– No travel allowed on February 15 – February 18, March 8 – March 15, March 22 – April 1 and April 5

– Book tickets no later than 11:59pm PT on December 13

You can book the cheapest AirTran flights here, or book Southwest fares directly at the airline’s website.

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