Dallas-based Southwest and its AirTran subsidiary launched the sale Tuesday, with round-trip prices ranging from $98 to $298 based on distance.
The sale, which ends Thursday night, covers a limited number of seats on nonstop flights from Aug. 26 through Dec. 18.
Days around Labor Day and Thanksgiving are blacked out, and the lowest prices aren't available for Friday and Sunday flights.
Airlines expect mostly full flights this summer -- but travel drops in the fall.
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