Today only, Frontier Airlines offers select 1-way fares nationwide with prices starting at $38.99 as part of its Spring Sale. (Click on "Frontier Airlines" in the top line to see this price.) That's the lowest price we could find for select routes by $56. This price is valid on flights departing from Fort Lauderdale, FL, (FLL) with arrival in Washington D.C. (IAD) on March 18. Book this travel deal today for travel on select dates from March 3 through May 20. Click here to see more routes.