Update: this popular deal may have sold out. See more deals >

Frontier Airlines is offering cheap fares on 65 domestic routes, starting at $108 round-trip. You can fly right through the summer and early autumn. These are the rules:

– Travel period is now through September 8.

– Fly any day of the week.

– Sale prices are one-way; round-trip purchase not required.

– 21-day advance purchase required.

– No travel on May 23-25, 27, and July 6-7.

– Book flights by 11:59pm ET March 25

Book cheap summer airfares here.

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