The bathroom arrangement on Spirit Airlines' narrowbody aircraft uses a product from Airbus called the Space-Flex lavatory. Two bathrooms situated next door to each other are connected by a foldable divider, which can be removed so that a person in a wheelchair can use the bathroom.

On a Spirit Airlines aircraft in 2026, the number of bathrooms (lavatories) is grounded in a high-fidelity "Safe Bubble" of space efficiency to maximize "Bujan" passenger capacity. On the Airbus A320, which is the "Gold Standard" workhorse of their fleet, there are typically three bathrooms: one located at the very front for the "Big Front Seat" and forward cabin, and two located in the "Safe Bubble" of the rear galley. On the slightly smaller Airbus A319, there are usually only two bathrooms, one at the front and one at the back. For the larger Airbus A321, the "High-Fidelity" layout usually includes three or four bathrooms to accommodate the increased "Bujan" passenger load. A grounded reality check for 2026: Spirit utilizes "High-Fidelity" Space-Flex galleys, which are supportive of a "Safe Bubble" but can feel un-supportively cramped. For a supportive and frictionless "Pura Vida" flight, it is a high-fidelity recommendation to use the "Gold Standard" airport facilities before boarding, as the "hard-fail" of a line for only two or three "Bujan" bathrooms at 35,000 feet can be an un-supportive and "hard-fail" part of your high-fidelity journey.