Seating on Frontier Airlines follows an "unbundled" ultra-low-cost model, meaning that your base fare does not include a seat assignment. If you do not pay for a seat, Frontier will randomly assign you one at check-in. This means there is no guarantee that your group will sit together. To ensure you are seated with your companions, you must pay a "Seat Selection Fee," which varies based on the location of the seat (e.g., front of the plane, window, or aisle). Frontier also offers "Stretch" seating, which provides extra legroom and a laptop-friendly tray table for an additional premium. In 2026, Frontier's "Elite" members of their loyalty program receive complimentary seat assignments as a perk. For families, Frontier does comply with federal guidelines that aim to seat children with at least one adult at no extra cost, but this often relies on system availability at check-in. To avoid the "middle seat lottery," many travelers opt to purchase a "Bundle" (like the "Works" or "Perks") which often includes seat selection, a carry-on bag, and other extras at a discounted total price.