If you’ve ever found yourself wondering what terminal is Spirit Airlines at IAH, rest assured that Spirit operates exclusively out of Terminal E at George Bush Intercontinental Airport, a modern concourse dedicated to many of the low-cost carriers serving domestic and Caribbean routes. From the moment you arrive curbside, clear signage guides you toward the Terminal E departures entrance, where Spirit’s bright yellow check-in kiosks and baggage counters await just beyond the sliding glass doors.