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Frontier offers $20 flights; tickets must be purchased July 6

Frontier Airlines is offering $20 flights to and from select cities — but you’ll have to act fast.

The $20 flights are only available for purchase on Thursday, July 6.

Departure cities include St. Louis, Philadelphia, Raleigh/Durham, New York, New Orleans and Los Angeles, among others.

Click here to see all the options and check availability.

The $20 flights are valid for travel on Tuesdays, Wednesdays, and Saturdays from August 15 to October 4. There is one blackout date: September 5 (the Tuesday after Labor Day.)

Additional travel services, such as baggageadvance seat assignments and food and beverages are available for purchase separately at an additional charge.