Cheap flights for September with Frontier Airlines — book by Monday

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

Frontier is currently offering sale fares all over the country. There are cheap flights on 61 domestic routes, with round-trip prices advertised from $158. These are the rules:

– You can fly August 26 through October 5.

– No Sunday flights.

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

– 3-day advance purchase required.

– Book flights by 11:59pm ET August 26.

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