George Bush Intercontinental Airport (IAH)
George Bush Intercontinental Airport (IAH) carries at least 5% of the passengers on 10 of the 100 busiest US routes. On those routes about 15.6 million passengers flew through it in 2025, counting each route's airport split.
CO2 on the routes through IAH
The routes through IAH run from 67 kg of CO2 per passenger (Dallas-Fort Worth to Houston) to 197 kg (New York to Houston), with a middle of 142 kg.
Every route that uses IAH, busiest first
| Route | Flown with | Share through IAH | kg CO2 per passenger |
|---|---|---|---|
| New York to Houston | EWR (43%), LGA (41%), JFK (2%) | 86% | 197 |
| Los Angeles to Houston | LAX (60%), SNA (11%), ONT (6%) | 76% | 183 |
| Miami to Houston | MIA (48%), FLL (38%) | 86% | 142 |
| Chicago to Houston | ORD (75%), MDW (2%) | 77% | 134 |
| Denver to Houston | DEN (73%) | 73% | 119 |
| Washington, DC to Houston | IAD (26%), DCA (26%), BWI (18%) | 69% | 193 |
| Atlanta to Houston | ATL (67%) | 67% | 116 |
| Dallas-Fort Worth to Houston | DFW (54%) | 54% | 67 |
| Orlando to Houston | MCO (68%) | 68% | 117 |
| Las Vegas to Houston | LAS (65%) | 65% | 164 |
Airport references
Source: US Bureau of Transportation Statistics (BTS), T-100 traffic and Schedule T-2 fuel filings; US EPA jet-fuel CO2 factor. Route calculation method.
Airlines on these routes
By passengers on the routes above, the largest are United Airlines, Southwest Airlines, Spirit Airlines, Delta Air Lines, American Airlines and Frontier Airlines.
About these figures. The CO2 per passenger is for the whole city pair, so it covers every airport the route uses. The airline filings the figures come from don't split fuel by airport, so we can't say how a flight from IAH compares with one from a neighbouring airport. The share column is the part of the route's passengers that flew through IAH, from the same filings. How the figures are built.