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

Frontier Airlines has just cut prices on 24 domestic routes — see the full list here. The airline is advertising round-trip fares from $118.

These are the rules:

– You can fly September 3 through October 23.

– No Friday or Sunday flights.

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

– Book flights by 11:59pm ET August 21.

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