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

The two airlines have posted another tandem flight sale this week, with cheap flights on over 100 domestic routes that are good for travel right through the fall. These are the rules:

– You can fly August 26 through December 18.

– No Friday or Sunday flights.

– No advance purchase required.

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

– No travel on September 2 or between November 26 and December 3.

– Book flights by 11:59pm PT June 28.

Read the full details on the AirTran and Southwest websites.

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