Spirit Airlines has launched a limited-time Independence Day sale offering one-way fares from just $49, available July 1–5, 2025. Travelers can explore historic U.S. cities like Philadelphia, Boston, New Orleans, and Charleston with nonstop routes and bundled savings through Spirit Vacations. The offer covers trips from July 22 to September 13, excluding select blackout dates. Bookings require a 21-day advance and must be made by July 5 via Spirit’s website.