Spirit Airlines via ShermansTravel offers Spirit Airlines 1-Way Flights Nationwide with prices starting at $40.20. (On the ShermansTravel landing page, click on "Spirit.com" in the top line to see this sale; all taxes are included.) That's the lowest price we could find for select routes by at least $6. (Most airlines charge at least $98.) This price is valid on flights departing from Detroit, MI, (DTW) with arrival in Baltimore, MD, (BWI) on June This sale includes flights to Dallas, TX, (DFW); Denver, CO, (DEN); New York, NY, (LGA); and more.