Frontier Airlines, the low-cost carrier based in Denver, is offering introductory one-way fares as low as $39 for people flying between Washington, D.C., and Orlando who book by May 17. The new service to Washington Dulles International Airport from Orlando International Airport starts Aug. 19, a release from Frontier said. "At Frontier, we are committed to offering customers low fares done right and that means offering choices and friendly service. Customers can easily choose what is important to them and optimize their travel experience for the comfort and value they seek," said Daniel Shurz, a Frontier senior vice president. Go to FlyFrontier.com to buy tickets.