Washington Dulles International Airport (IAD)
Washington Dulles International Airport (IAD) carries at least 5% of the passengers on 11 of the 100 busiest US routes. On those routes about 7.0 million passengers flew through it in 2025, counting each route's airport split.
CO2 on the routes through IAD
The routes through IAD run from 82 kg of CO2 per passenger (Washington, DC to Charlotte) to 290 kg (Los Angeles to Washington, DC), with a middle of 124 kg.
Every route that uses IAD, busiest first
| Route | Flown with | Share through IAD | kg CO2 per passenger |
|---|---|---|---|
| Denver to Washington, DC | DEN (48%) | 48% | 192 |
| Atlanta to Washington, DC | ATL (23%) | 23% | 104 |
| Los Angeles to Washington, DC | LAX (45%) | 45% | 290 |
| Washington, DC to Orlando | MCO (22%) | 22% | 124 |
| New York to Washington, DC | EWR (19%), LGA (9%) | 28% | 86 |
| Chicago to Washington, DC | ORD (17%) | 17% | 121 |
| Washington, DC to Houston | IAH (26%) | 26% | 193 |
| Dallas-Fort Worth to Washington, DC | DFW (18%) | 18% | 178 |
| Washington, DC to Boston | BOS (11%) | 11% | 100 |
| Miami to Washington, DC | FLL (7%), MIA (5%) | 12% | 144 |
| Washington, DC to Charlotte | CLT (20%) | 20% | 82 |
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, American Airlines, Delta Air Lines, Frontier Airlines and Republic Airways.
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 IAD compares with one from a neighbouring airport. The share column is the part of the route's passengers that flew through IAD, from the same filings. How the figures are built.