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Frontier Airlines is offering flights starting at $21 one-way. This sale is for tickets purchased through end of day today Tuesday June 30, 2015 for travel August 22 through November 18 and December 2 through December 16, 2015.
Unfortunately though, it seems like the sale fares are only available for travel on Tuesday, Wednesday, and Saturday, but if you have flexibility you might be able to find a great deal! There are actually a bunch of routes available at the $21 one-way price!
Since you can book one-way fares, if the cheap fare is not available on the return on outbound, you can always book with another airline. Remember though, Frontier does add one some fees for additional services, such as carry on luggage and seat assignments.
Anyone able to snag a good deal? If so, enjoy!