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

Frontier Airlines is selling cheap flights to Denver, departing from five airports across the country and good for travel in both directions. The airline is advertising round-trip fares from $76.

These are the rules:

– Travel dates vary on each route. You can generally fly November through February.

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

– Book flights by 11:59pm ET August 1.

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