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.