Today only, Frontier Airlines offers select 1-way fares with prices starting at $31.09 as part of its Ice Bucket Challenge Sale. That's $3 under our May mention and the lowest base fare we've seen from Frontier this year. It's also a current low for select routes by $43. This price is valid on flights departing from Washington D.C. (IAD) with arrival in Tampa, FL, (TPA) on October 1; prices vary depending on the departure cities and dates chosen. Book this travel deal today for travel on select dates from September 3 through November 12. Other notable fares: