Right now Frontier is selling cheap flights on 34 domestic routes, with prices starting at $78 round-trip. But the sale is only valid until midnight Thursday, so don’t delay.

These are the rules:

– You can fly January 16 through May 16, with some exceptions.

– Tuesday, Wednesday and Saturday flights only.

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

– Book flights by 11:59pm ET January 8.

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