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

The two partner airlines are doing a big domestic sale this week. Hundreds of routes have been discounted, starting at $118 round-trip. These are the rules:

– You can fly May 14 through October 30.

– Tuesday and Wednesday flights only.

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

– 10-day advance purchase required.

– Book flights by 11:59pm PT May 9.

See the full details on the AirTran and Southwest websites.

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