Houston Airport (George Bush Intercontinental, IAH) has five terminals A, B, C, D, and E spread across a 10,000-acre campus roughly 23 miles north of downtown Houston. Terminal A handles mostly non-United domestic carriers, B and C serve United’s domestic network, and D and E handle international arrivals with customs and immigration. Two train systems, the Skyway and the Subway, connect every terminal, and the airport has moved more than 48 million passengers in 2025.
| A Domestic | B Rebuilding | C United Hub | D Int’l | E Int’l |
How Big Is Houston’s Airport, Really?
George Bush Intercontinental Airport isn’t just Houston’s busiest airport it’s one of the physically largest airports in North America. The full complex spans more than 10,000 acres, which works out to over 15 square miles, an area large enough to swallow the island of Manhattan with room left over. That footprint is exactly why the airport needed five separate terminals instead of one central building: no single structure could realistically sit that many gates, airlines, and passenger flows under one roof.
| Attribute | Details |
| Official Name | George Bush Intercontinental Airport |
| IATA Code | IAH |
| Terminals | 5 Passenger Terminals (A, B, C, D, and E) |
| Total gates | 130+ |
| Runways | 5 Runways |
| Destinations served | 187+ |
| Annual Passengers | Approximately 48.4 million passengers (2025) |
| Distance From Downtown | Approximately 23 miles (37 km) |
| Address | 2800 N Terminal Rd, Houston, TX 77032, United States |
| Operator | Houston Airport System (HAS) |
| Website | https://www.fly2houston.com/iah |
IAH is the primary hub for United Airlines and a focus city for Spirit Airlines, with more than 27 carriers operating out of the airport altogether. Between domestic and international routes, IAH connects Houston to 118 U.S. destinations and 69 destinations abroad, ranking it among the 15 busiest airports in the country and the second-busiest in Texas for international traffic, just behind DFW. None of that scale would be usable, though, without a clear terminal system which is where Terminals A through E come in.
Houston Airport Terminals A Through E: Full Breakdown
Each Houston Airport terminal has its own personality, airline mix, and gate layout. Here’s what to expect at each one, based on the current 2026 layout.
Terminal A
Terminal A is where most of Houston Airport’s non-United domestic traffic lands. It’s split into two concourses, each with its own independent security checkpoint, a detail that trips up first-time flyers who assume one checkpoint covers the whole terminal.
- Gates: 29 total (North + South concourses)
- Flights: Domestic + select international
- North Concourse: Gates A1 to A3H
- South Concourse: Gates A17 to A30
- Airlines: American Airlines, Delta Air Lines, Alaska Airlines, JetBlue, Southwest Airlines, Frontier Airlines, and Spirit Airlines (Spirit’s international departures also operate from Terminal A)
- Lounges: Admirals Club near A25, United Club near A9
- Dining: Cadillac Mexican Kitchen, The Breakfast Klub Express, plus regional retail
Terminal B (Lobby closed through 2026)
Terminal B primarily handles United Express regional jet flights. As part of the airport-wide redevelopment program, Terminal B’s main lobby is closed for a major rebuild expected to run through late 2026. This isn’t a full shutdown; gates B3 through B31 are still active but the check-in and security process has changed.
- Status: Lobby closed, gates operating
- Check-in: Via Terminal C
- All Terminal B passengers must check in and clear security through Terminal C
- Skyway access connects passengers from Terminal C directly to Terminal B gates after security
- Primarily serves United Express regional jet routes
Terminal C
Terminal C is the busiest domestic terminal at Houston Airport and United’s main operating base for flights within the U.S. It’s a large, multi-level facility, so allow extra walking time if your gate is at the far end of the concourse.
- Flights: Domestic (United mainline)
- Connection: Skyway + Subway access
- Airlines: United Airlines (primary), with United Express connections through Terminal B
- Lounges: United Club locations throughout the terminal
- Amenities: Extensive dining, retail, and seating across multiple floors
- Also serves as the check-in and security point for Terminal B passengers
Terminal D
Terminal D is one of two international-focused terminals at Houston Airport and houses the airport’s strongest lounge lineup for premium travelers. If you’re arriving from abroad on a non-United carrier, this is very likely where you’ll clear customs.
- Flights: International (non-United)
- Processing: Customs & immigration
- Handles international non-United arrivals and departures
- Recently expanded with the new Terminal D West Pier, part of the redevelopment program
- Lounges: Centurion Lounge, Air France–KLM Crown Lounge, British Airways lounge
- Duty-free shopping and currency exchange services for international travelers
Terminal E
Terminal E is United Airlines’ international headquarters at IAH, handling the bulk of the carrier’s long-haul departures to Europe, Latin America, and beyond. It’s currently being modernized under the same redevelopment program that’s reshaping Terminal D and Terminal B.
- Flights: International (United long-haul)
- Processing: Customs & immigration
- Primary hub for United’s international and Polaris long-haul network
- Lounges: United Polaris Lounge consistently ranked among United’s best worldwide
- International arrivals hall with dedicated customs and immigration processing
- Undergoing active modernization as part of the IAH Terminal Redevelopment Program
Houston Airport Terminal Quick-Reference
| Terminal | Main Airlines | Flight Type | Key Lounges | Status |
| A | American, Delta, Alaska, JetBlue, Southwest, Frontier, Spirit | Domestic + select international | Admirals Club, United Club | Fully open |
| B | United Express | Domestic (regional) | Accessed via Terminal C | Lobby closed |
| C | United Airlines | Domestic (mainline) | United Club | Fully open |
| D | International carriers (non-United) | International | Centurion, Air France–KLM, British Airways | Fully open + expanding |
| E | United Airlines | International (long-haul) | United Polaris Lounge | Under modernization |
How to Travel Between IAH Terminals
Because Houston airport terminals are spread across such a large footprint, IAH runs two separate automated train systems so passengers aren’t stuck walking the entire property:
- Skyway: an inside-security, above-ground train connecting Terminals A, B, C, and the D/E complex, the option to use if you’re already through security and connecting to another gate area.
- Subway: an outside-security, underground train used by passengers who need to switch terminals before or after clearing security (for example, picking up checked bags or meeting someone at arrivals).
- Airside walkways: direct connector walkways link Terminal C to Terminals B, D, and E without needing the train at all.
| Route | Best Option | Security Status | Notes |
| Terminal A ↔ Terminal C | Skyway or Subway | Inside or outside security | Skyway is faster if already past security |
| Terminal C ↔ Terminal D/E | Airside walkway or Skyway | Inside security | Walkway avoids waiting for the train |
| Terminal C ↔ Terminal B | Connector walkway | Inside security | Direct, no train needed |
| Any terminal ↔ arrivals/baggage claim | Subway | Outside security | Required after landing, since baggage claim sits pre-security |
| Terminal D ↔ Terminal E | Connected walkway | Inside security | Shared arrivals/departures area |
Tip: Because IAH’s Houston airport terminals are large and spread out, airport staff generally recommend budgeting extra time for any inter-terminal connection especially between Terminal A and Terminal D/E, which sit at opposite ends of the property.
The IAH Terminal Redevelopment Program
Houston Airport is in the middle of one of its largest construction efforts since it opened in 1969. The IAH Terminal Redevelopment Program is a multi-billion-dollar initiative aimed at modernizing the terminal complex for the next several decades of growth, and it directly affects how a few terminals currently operate:
- Terminal B: Main lobby closed for a full rebuild through late 2026; gates B3–B31 remain in service via Terminal C check-in
- Terminal D: Newly opened West Pier expansion adding gate capacity and updated passenger space
- Terminal E: Active modernization to expand international capacity and streamline customs processing
Travelers flying through Houston Airport in 2026 should build in a little extra buffer time, spring break, and major holidays, when construction zones and passenger volume combine to slow things down at security and curbside.
Dining, Lounges & Amenities by Terminal
Houston Airport has invested heavily in its passenger experience over the last few years, and it shows. Across all five terminals, IAH operates 13 lounges in total seven of which accept day-pass entry, with two Priority Pass–eligible lounges located in Terminal D alone. Dining ranges from grab-and-go coffee counters to full sit-down restaurants, and every terminal has retail and duty-free options appropriate to its passenger mix. A few standouts worth knowing before you fly:
- Terminal A leans local, with Houston-born concepts like The Breakfast Klub Express alongside national chains
- Terminal D has the deepest lounge bench for premium and international travelers
- Terminal E’s United Polaris Lounge is regularly cited as one of the best in United’s entire network
- Free Wi-Fi and rotating art installations are available airport-wide, not just in select terminal
Ground Transportation at Houston Airport Terminals
Every terminal at Houston Airport has its own taxi stand at the baggage claim level, and ride-share pickup points are clearly marked outside Terminals A and C. There’s also a consolidated rental car facility connected by shuttle, and the Houston METRO’s Route 102 Bush IAH Express links the airport to downtown roughly every 15 to 30 minutes.
For travelers who don’t want to gamble on shared shuttles, surge pricing, or a driver unfamiliar with which of the five terminals they actually need, a pre-booked private Houston Car Service removes the guesswork entirely, especially given how spread out IAH’s terminal campus really is.
| Skip the Terminal Confusion — Book Ahead Houston Car Service provides direct, terminal-accurate pickups and drop-offs at every one of IAH’s five terminals A, B, C, D, and E with flight tracking, meet-and-greet service, and a professional chauffeur waiting curbside instead of a rideshare queue. Whether you’re landing at Terminal D for an international arrival or catching a domestic flight out of Terminal C, Houston Car Service gets you to the right terminal door, on time, every time. Book Your Houston Airport Transfer |
Frequently Asked Questions
How many terminals does Houston’s IAH airport have?
IAH has five passenger terminals, labeled A, B, C, D, and E, connected by the Skyway and Subway train systems and by airside walkways.
Which terminal at IAH is for international flights?
Terminal D the Mickey Leland International Terminal handles most international carriers and includes U.S. Customs. Terminal E covers United’s international departures and arrivals, including the Polaris Lounge.
Which terminal does United Airlines use at Houston airport?
United’s domestic flights are based mainly in Terminal C, while its international long-haul flights operate out of Terminal E, with United Express service split between Terminal B and Terminal C.
How do I get between terminals at IAH?
Use the Skyway if you’re already through security, the Subway if you need to cross terminals before or after security (such as for baggage claim), or the airside walkways connecting Terminal C to Terminals B, D, and E.
What is the busiest terminal at Houston airport?
Terminal C is the busiest at IAH, since it functions as United Airlines’ main domestic hub and carries the heaviest concentration of gates, dining, and shopping.
How far is IAH from downtown Houston?
George Bush Intercontinental Airport sits approximately 23 miles (37 km) north of downtown Houston, roughly a 25–40 minute drive depending on traffic.
Final Thoughts
Houston’s IAH airport can feel intimidating at first glance simply because of its size. Five separate terminals spread across more than 15 square miles is a lot of ground to cover. But once you understand that Terminal A and B handle mostly domestic short-haul traffic, Terminal C is United’s domestic engine room, and Terminal D and E cover the international side. The layout becomes far easier to plan around.
Add in the Skyway, Subway, and connector walkways, and moving between Houston airport terminals is more straightforward than the airport’s footprint might suggest whether you’re grabbing a bite in Terminal C, clearing customs in Terminal D, or settling into the Polaris Lounge in Terminal E before a long-haul flight home.
Visit Social Account.
