Cheap flights: Frontier Airlines offers 90% off some flights, new unlimited travel pass

Frontier Airlines has some new deals this week that could make your travels later this year super affordable.

One of the sales includes a 90% discount on certain flights for the airline's Discount Den members, and Frontier is also offering a promotional $699 all-you-can-fly pass for summer flights, as well as an early release on the annual unlimited flight pass.

"We are thrilled to launch travel using the GoWild! All-You-Can-Fly Pass early and offer this special early access promotion to our valued pass holders," Tyri Squyres, vice president of marketing at Frontier Airlines, said in a statement. "This is an exciting opportunity to begin using your pass benefits now and start making plans to visit a wide variety of U.S. and international destinations served by Frontier."

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Keep in mind these deals come with some important fine print, so before you go punching in your credit card details, here's what you need to know.

90% off all Frontier flights

Members of Frontier Airlines' Discount Den can get 90% off all flights booked through Thursday using the promo code: SAVE90.

According to Frontier, flights operating Mondays through Thursdays and Saturdays between Aug. 16 and Nov. 15 are eligible for the deal. However, the terms note that some routes may be excluded, and promotional seats are limited.

Round trip purchase is required to take advantage of the discount, and Aug. 31, Sept. 1-4 and Oct. 6-9 are blackout dates for the deal.

Unlimited flight passes

Frontier also announced two unlimited flight pass sales.

For $699, you can get unlimited flights through Sept. 30. And for $1,999, you can get unlimited flights until May 2, 2024.

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But these deals come with some important restrictions, including blackout dates, which are listed the airline's website, along with the full terms. Flights booked using the unlimited passes do not include extras like seat selection or checked bags, which must be paid for separately, and are not eligible to earn miles.

Once enrolled in the annual pass, you'll be automatically renewed unless you cancel.

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 offers 90% off some flights and new unlimited passes