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DENVER — 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.

The destinations available from Denver International Airport include Las Vegas; Phoenix; San Antonio; Kansas City, Missouri; Omaha, Nebraska; and Sioux Falls, South Dakota.

There’s a $20 flight from Colorado Springs to Los Angeles. Options and availability are limited.

The $20 flights are valid for travel on Tuesdays, Wednesdays and Saturdays from Aug. 15 to Oct. 4 with one blackout date, Sept. 5, the day after Labor Day.

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