DENVER (KDVR) — Flying on a budget feels unheard of in the post-pandemic travel craze, but Frontier Airlines is making it possible, offering select flights for under $30 for a short time.

The promotional offer is part of Frontier Airlines’ 30th birthday celebration, the company announced Tuesday. It covers 100 routes, all of which will have one-way fares for as low as $29.

Frontier Airlines has a list of all the origins and destinations that will be available for this promotion on its website. Popular cities on the list include Denver, Atlanta, Orlando, and Las Vegas.

“We want to thank our customers for their loyalty as we celebrate our 30^th birthday this year and what better way to do so than by offering amazing fares to so many incredible destinations,” said Tyri Squyres, vice president of marketing for Frontier Airlines.

If you have plans to travel this summer or fall, you may want to check if your destination made the list as this promotion will be available for travel dates through Nov. 13, 2024.

Travelers can book using the promotion from Tuesday to Thursday this week. Frontier said some blackout dates and restrictions apply.

It’s worth noting that Frontier Airlines may already have a better deal for the destination you’re hoping to fly to. For example, Google Flights shows you can fly from Denver to Salt Lake, one way, for just $19. For Frontier, as well as some other budget airlines, the fare does not include things like baggage and advanced seat assignments. Those can be purchased at an additional charge.

Last month, Frontier — which has struggled more than other U.S. carriers to recover from the pandemic — said it would eliminate change fees on some tickets and create four fare classes to boost its appeal to more travelers.

The Denver-based airline said the changes, which took effect in May, would make buying a ticket less complicated.

CEO Barry Biffle called the announcement “the beginning of a new era for Frontier.”

The Associated Press contributed to this report.