Frontier Airlines is celebrating Green Week and offering free roundtrip flights to those that have the last name of "Green" or "Greene". If that is your last name, you are in luck. Here is how it works. Your flight must depart on August 13 and return by 11:59 p.m. on August 20.

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Frontier states that the passengers with those names will be refunded up to $400, so if your flight is more expensive, you will be paying the remaining balance. The "Green" deal is for those with the current last name and maiden names will not count. If you want to claim your free flight with your last name, you can head on over to Frontier's website.

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