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

Frontier Airlines has just cut prices on 26 domestic routes and the fares are cheaper than usual. But the sale is valid for today only.

These are the rules:

– Travel dates vary on each route. You can fly on selected dates in September, October and November.

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

– Book flights by 11:59pm ET tonight.

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