The airline's new worldwide routes are also included in the sale, but the sale prices are only offered on Tuesday and Wednesday flights.
There are also other restrictions, like the fact you won't be able to buy tickets for flights on Fridays and Sundays, and the fares apply to non-stop options only.
Looking for a great deal on airfare?
From Dallas Love Field, more than three dozen destinations from California to Florida are listed with sale fares.
Flights from Detroit Metro Airport to Baltimore and Chicago Midway are available for $49 each way. That includes one-way flights to New Orleans are starting at $49; to Tampa for $79; to Las Vegas for $99 and to Portland $129.
You only have until 11:59pm Thursday, October 12, to purchase tickets at the lower fares.
The sale launched Tuesday morning and covers travel from October 31 through December 19, and from January 3 through February 14, CNBC reports.