Houston's two-airport system closed 2025 with 62 million passengers: Bush Intercontinental, where United controls three of every four seats and international traffic hit a record 12.4 million, and Hobby, North America's first 5-Star Skytrax airport — with a $2.5 billion Terminal B now rising over the whole operation.
No big American airport belongs to one airline the way IAH belongs to United: 74.1% market share, 35.7 million passengers on one tail, and a route map built around Latin America — Mexico City is the number-one international route at 850,000 passengers a year, ahead of Cancún and San Salvador. The 2025 international count set a record at 12.4 million, with ZIPAIR opening Tokyo, United adding Rome for 2026, and Edmonton returning on Air Canada.
The rebuild matches the fortress: the $2.5 billion Terminal B transformation — 40 reconfigured gates, a new central processor and the largest United Club in the network at 50,000 square feet — tops a program that has already delivered Terminal D's West Pier and expanded international processing. Terminal C is the workhorse at 15.7 million passengers; Terminal E takes the Polaris long-hauls.
William P. Hobby carried 13.9 million passengers in 2025 — down with Southwest's national trimming — but keeps the credential no other airport on the continent holds: North America's first and only 5-Star Skytrax rating. Southwest runs roughly nine of ten seats here, and the west concourse expansion opening in 2027 adds seven gates for domestic and international flying.
The third airport is the story nobody else can tell: Ellington Field hosts the Houston Spaceport, the tenth FAA-licensed commercial spaceport in America, alongside NASA and military traffic. Between IAH's 189 nonstop destinations, Hobby's 81 and a spaceport, Houston's air system handles more passengers than all but a handful of metro regions on earth.
Our read: IAH is a connecting machine first and a destination airport second — so use it like one: the 500 Downtown Direct bus from Terminal E is $4.50, luggage-friendly, and lands at the convention center's door, while the $1.25 Route 102 is the locals' answer when time is cheap. During the Terminal B works, budget an extra 20 minutes landside and learn the inter-terminal train — 3.3 million riders used it last year at 99.76% reliability. Flying into Hobby for Galveston cruises saves an hour versus IAH.
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