Spirit Airlines Terminal IAH: Complete Guide to Houston Airport Terminal VISIT: https://airlinesterminaloffice.com/spirit-airlines/spirit-airlines-iah-terminal-george-bush-intercontinental-airport/ Wondering about the Spirit Airlines terminal at IAH? Spirit Airlines operates from Terminal A at George Bush Intercontinental Airport (IAH) in Houston. Get details on check-in, security, boarding, and more. Plan your trip smoothly with everything you need to know about the Spirit Airlines terminal IAH.