Spirit Airlines, one of the world’s most well-known ultra low-cost carriers, is celebrating a major milestone in Southern California and is inviting travelers to join in on the festivities.

Spirit is marking 25 years of service at LAX, and as part of the celebration, the airline is offering deep discounts on its one-way flights, including three departures for only $25.

But the discounts are not here to stay; the special offer must be booked on Friday, July 12.

The flights must take place some time between Aug. 13 and Oct. 10 aboard one of the 40 nonstop flights to the 25 destinations that Spirit services of LAX. The $25 flight deal applies to Los Angeles flights to Oakland, Las Vegas and Reno, Nevada.

The complete list of discounted flights and their frequency out of LAX is below:

In addition to the direct flights, Spirit is offering travelers who belong to its rewards program bonus points for one-way and roundtrip flights that takeoff between Aug. 15 and Oct. 31.

“We first landed at Los Angeles International Airport 25 years ago and are proud to have grown to be one of the largest low-fare airlines at LAX, thanks to the support of our Guests and long-term partners at Los Angeles World Airports,” said Spirit Airlines CEO Ted Christie.

The budget airline also celebrated the 25-year milestone by making a $25,000 donation to the L.A. nonprofit TreePeople.

“The sizable donation will advance the organization’s support of sustainable urban ecosystems in the Greater Los Angeles area through education, volunteer community-based action, and advocacy,” a Spirit news release states.

Christie says the airline is looking forward to continuing to serve L.A. travelers and “investing in the local community through the Spirit Charitable Foundation.”

To read more about the limited time deals and additional fees and restrictions, click here.