Avoid booking air tickets on Frontier Airlines thru Orbitz or other on line web site. You may end up with cheap tickets but NOT a bargain! You may end up with their "Basic" level tickets which do not allow you to get a seat assignment and charge you for carry on bag in addition to charges for checked bags. You can call them and pay the fee to upgrade your seat in order to get an assigned seat but you will be stuck paying for your checked bag. It might cost you more than another airline if you have to pay these fees.