99% off flights? Frontier Airlines is running a big promotion Tuesday only

Frontier Airlines is running a “fly for practically free” sale, with 99% off base fares if you buy Tuesday.

Yes, you read that correctly. If you use the discount code SAVE99, you’ll only have to pay 1% of the advertised fare on Frontier flights you buy by 11:59 p.m. ET Tuesday.

The discount is only for the base fare – taxes and fees will still be charged in addition to the discount.

Friday and Sunday flights are not eligible for the deal, and travel must occur by Dec. 13. Oct. 5 and 9, and Nov. 18-28 are blackout dates.

According to Frontier, some routes are excluded and round-trip purchase is required. The deals also may not be available on some flights if only certain fare classes are on sale.

Frontier charges for extras like checked and carry-on bags, seat selection and onboard food and snacks. Fees for those add-ons are also not included in the promotion. Check out all the details of the promotion by clicking here.

But the point is: Act fast. This deal is only available for a short time.

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Beyonce Sweepstakes

Frontier is also running a contest to give away free tickets to Beyoncé's concert in Houston. You can enter on the airline's website by clicking here.

Winners will receive two free tickets to the concert, round-trip flights on Frontier, two nights of lodging, and a $500 stipend.

To enter, you must have or register for a Frontier Miles account. The sweepstakes is only accepting applicants until 11:59 p.m. MT on Wednesday. Only U.S. residents age 18 or older are eligible.

Frontier's press materials emphasize that this contest is not officially endorsed by Beyoncé.

Zach Wichter is a travel reporter for USA TODAY based in New York. You can reach him at zwichter@usatoday.com

This article originally appeared on USA TODAY: Frontier Airlines is running a 99% off sale for most flights