George Bush Intercontinental Airport (IAH) is the primary commercial airport serving the Houston metropolitan area and the largest hub worldwide for United Airlines. Located approximately 23 miles north of downtown Houston, IAH connects one of America's most economically important cities to domestic destinations across the United States and to international routes spanning the Americas, Europe, Asia, and the Middle East.
George Bush Intercontinental Airport is United Airlines' most important hub worldwide by route count and is the airport that provides Houston — a city defined by energy, petrochemicals, healthcare, and international trade — with its extraordinary global connectivity. IAH handles approximately 50 million passengers annually and operates five terminals connected by an underground tram system called the Subway.
The airport is organized around a central terminal complex with five terminals (A through E) arranged in a roughly oval pattern. Terminals A, B, and C are connected by the Subway tram. Terminal D is the international terminal and is connected to Terminal E and to the Subway network. The Subway runs continuously and allows connecting passengers to move between terminals on the airside without clearing security again — though some terminal combinations do require security re-entry.
Houston's position as a global energy capital gives IAH a distinctive international character. The airport handles significant business travel from the global oil, gas, petrochemical, and engineering sectors, and serves as the primary U.S. departure point for many routes to Latin America that United operates.
Houston Intercontinental Airport, as it was originally named, opened in 1969 to replace Houston's older Hobby Airport as the city's primary commercial facility. Hobby Airport, located closer to downtown Houston, was retained and continues to operate as a secondary airport today. The new airport was named after President George H.W. Bush in 1997 when Bush was a former president and Houston resident.
Continental Airlines, which was headquartered in Houston, established IAH as its primary hub in the 1980s and transformed the airport into a major international gateway over the following two decades. The 2010 merger of Continental and United Airlines transferred the IAH hub to United, which has continued to operate and invest in IAH as its largest network hub.
IAH has five passenger terminals. Terminal A handles United Airlines domestic operations. Terminal B handles United and regional partner operations. Terminal C is United's primary domestic hub facility and the largest terminal at IAH. Terminal D is the international terminal, handling international departures and arrivals for United and foreign flag carriers, and features the federal inspection facility for arriving international passengers. Terminal E is used primarily for international charter and some additional carrier operations.
The underground Subway tram connects Terminals A, B, C, and D. Terminal E is connected to Terminal D via an above-ground connector. Passengers connecting between most terminals can use the Subway without exiting security. However, some connections from international terminals to domestic gates require customs clearance and security re-entry — allow substantial time for these connections.
United Airlines accounts for the vast majority of flights at IAH, operating its global hub from terminals A, B, C, D, and E. United's IAH hub provides nonstop service to cities throughout the continental United States, Alaska, and Hawaii, and international routes to Europe (London, Frankfurt, Amsterdam, Madrid), Latin America (more than 30 countries), Asia (Tokyo, Seoul, Manila), the Middle East, and beyond.
Other airlines serving IAH include American Airlines, Delta Air Lines, Southwest Airlines (limited), international carriers from Latin America and Europe, and regional partner carriers operating as United Express. IAH is one of the best-connected airports in the United States for Latin American destinations.
Terminal C, United's primary hub terminal, offers the most comprehensive amenities at IAH including United Club lounges, a wide range of dining options, and retail shops. Terminal D (international) has been renovated and features improved dining and international-focused retail. Other terminals vary in amenity quality, with Terminals A and B offering more basic services.
Free Wi-Fi is available throughout IAH. The airport features public art installations, nursing rooms, interfaith chapels, and pet relief areas across the terminal complex. Houston's Space Center Houston proximity is sometimes referenced in airport displays reflecting the city's aerospace heritage.
IAH does not have a direct light rail connection to downtown Houston. Ground transportation options include the Park & Ride express bus service to downtown Houston (operated by METRO), rideshare services, taxis, and rental cars. The drive from IAH to downtown Houston is approximately 30–45 minutes under normal traffic conditions, extending to an hour or more during rush hour.
Rideshare services pick up from designated areas on the ground level of each terminal. The Rental Car Center is located on-site and accessible via a free shuttle. IAH is accessible via I-69 (US-59) to the south toward downtown and I-45 to the southeast toward Galveston.
IAH offers extensive parking in multiple garages and surface lots adjacent to each terminal, plus economy lots with shuttle service. The terminal garages offer the most convenient covered parking. Economy lots offer lower rates with shuttle bus connections. The airport's large size and the absence of a rail alternative means a higher proportion of IAH travelers drive and park compared to airports with direct rail connections.
Advance parking reservations are recommended during Houston's peak travel periods, which include major energy industry conferences, the Houston Livestock Show and Rodeo (February–March), and summer holidays.
IAH is a large airport and terminal-to-terminal distances are significant. The Subway tram is the most efficient way to move between terminals — walking between terminals is very long and not practical for connections. For international connections clearing customs at Terminal D, plan for at least 90 minutes to process through customs and immigration, re-check bags if required, and clear security again.
United's bank schedule at IAH creates concentrated departures and arrivals at certain times of day. If you have a choice, morning departures tend to accumulate fewer weather-related delays. Houston's climate can generate significant summer thunderstorms that periodically cause ground stops — build buffer time into tight itineraries when traveling June through September.
George Bush Intercontinental Airport is the front door to the Houston metropolitan economy — the fourth-largest metropolitan area in the United States and the undisputed global capital of the energy industry. IAH's international connectivity is directly tied to the global flow of capital, personnel, and technology in oil, gas, petrochemicals, and engineering. Houston's major energy companies, medical center, and port operations all depend on the air access that IAH provides.
IAH supports hundreds of thousands of jobs in the Houston region and generates tens of billions of dollars in annual economic activity. Its status as United's largest global hub gives Houston connectivity that extends far beyond what its domestic role would suggest, linking the city directly to every major energy-producing region on earth.
IAH is pursuing infrastructure improvements to address aging terminal facilities, particularly in Terminals A and B, which are among the older structures at the airport. United Airlines and the Houston Airport System have discussed potential Terminal B redevelopment. Broader improvements include airfield capacity enhancements and sustainability programs. The question of a rail connection to downtown Houston — repeatedly studied and not yet built — remains a long-term planning consideration for the region.
IAH is a primary international gateway and major hub in the southern United States. It functions as United Airlines' largest global hub, connecting Houston to destinations across the Americas, Europe, Asia, and the Middle East.
Airports within approximately 60 miles of George Bush Intercontinental Airport that may provide additional scheduled commercial, regional access.
George Bush Intercontinental Airport is Houston's primary connection to the world — a massive hub shaped by the global energy industry, United Airlines' dominant network, and the international character of one of America's most economically diverse cities. For the millions of business travelers, energy professionals, and leisure passengers who move through IAH each year, the airport provides access to an extraordinary range of destinations, particularly in the Americas.
There is no direct rail connection from IAH to downtown Houston. Options include the METRO Park & Ride express bus, rideshare services (Uber, Lyft), taxis, and rental car. The drive takes approximately 30–45 minutes under normal conditions, longer during rush hour.
United Airlines is the dominant carrier, operating IAH as its largest global hub. American Airlines, Delta, Southwest, and several international carriers also serve IAH.
The underground Subway tram connects Terminals A, B, C, and D on the airside. Terminal E connects to D via an above-ground connector. The Subway runs continuously and is free for passengers within the secure zone.
Yes — IAH is one of the top U.S. airports for Latin American connectivity. United Airlines operates nonstop flights to more than 20 Latin American countries from IAH, making it a strong hub for travel throughout Central and South America.
For the most current flight schedules, parking availability, terminal maps, and ground transportation updates, visit the official George Bush Intercontinental Airport website.
George Bush Intercontinental Airport Official Site