IAH is United's second-largest hub and the primary international gateway for the US Gulf Coast, serving around 46 million passengers a year across five terminals. It's the main US springboard to Mexico and Latin America, which gives it an unusual double-peak: heavy early-morning domestic banks plus a strong late-evening international push. The five terminals are far apart — terminal changes here take real time.
Planning to fly from IAH?
Check Current BusynessIAH crowd patterns — by the numbers
From our modelWe modeled a full typical week at IAH — every hour, every day, every aircraft size — to surface patterns that show up week-over-week. Here's what George Bush Intercontinental actually looks like.
When is IAH actually busy?
Crowd score by local hour, averaged across the typical week. Hover any bar for the exact value.
Best times to fly out of IAH
- 7 PM
Late-evening wind-down
low - 4 PM
Brief afternoon dip before evening rush
low - 5 PM
Off-peak hours
low
Worst times to fly out of IAH
- 1 PM
Sustained peak window
medium - 3 PM
Sustained peak window
medium - 12 PM
Sustained peak window
medium
Day of the week: when is IAH most painful?
Avg crowd score across daytime hours (6 AM – 10 PM local).
Aircraft mix at peak hour
Wide-body and regional jets disproportionately affect crowd levels — they unload at very different rates.
How IAH compares to other major hubs
Avg crowd score across daytime hours. Lower = easier travel day.
- IAHHouston6.3
- ATLAtlanta5.7
- ORDChicago5.7
- DFWDallas5.6
- JFKNew York5.4
- LAXLos Angeles5.1
Terminals & Airlines
Terminal A
American, Delta, Alaska, Frontier, SpiritThe main non-United terminal. Security is usually calmer than the United terminals.
Terminal B
United Express (regional)Regional jets dominate. Gates are split across two sides — check B-North vs B-South.
Terminal C
United (domestic)United's domestic core. Busiest 5-8 AM as the first bank pushes out.
Terminal D
International carriers (Lufthansa, Emirates, Air France, etc.)All non-United international departures. Evening long-haul bank means 4-7 PM crowds.
Terminal E
United (international + some domestic)United long-haul home. Connected to C airside — walkable without re-clearing security.
Security & TSA Tips
- •TSA PreCheck available at Terminals A, C, D and E
- •CLEAR available at Terminals A, C and E
- •The 5-8 AM United domestic bank is the heaviest security window of the day
- •Terminal D international check-in counters open ~3.5 hours before long-haul departures and queue early
- •Connecting between terminals? Stay airside and ride the Skyway — exiting to landside means re-clearing security
Average Security Wait Times
Low
10-15 min
Medium
20-30 min
High
35-50 min
Extreme
60+ min
Parking & Transportation
Parking Options
💡 Ecopark 2 shuttles run more frequently than Ecopark 1. Terminal garages fill by mid-morning during spring break and holidays.
Public Transportation
- •Skyway (airside train): connects all terminals after security — use it instead of exiting
- •Subway (pre-security underground walkway): connects terminals and the on-site Marriott
- •METRO Bus Route 102: to downtown Houston (about 50 minutes, $1.25)
- •Rideshare/Taxi: about 30-45 minutes to downtown depending on traffic
Dining & Food
Pappadeaux Seafood Kitchen
Terminal E • Cajun/Seafood
The Houston institution — worth planning a connection around
Killen's BBQ
Terminal C • Texas BBQ
Legit Texas barbecue from the Pearland pitmaster
El Real Tex-Mex
Terminal A • Tex-Mex
Solid breakfast tacos before the morning bank
Common Bond
Terminal D • Bakery/Café
Houston favorite for pastries and coffee
Amenities
Nearby Hotels
Ready to check how busy IAH will be?
Check Airport Busyness