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D

Houston (IAH) departure delays

9,903 departures · 97 routes · March 2025 – August 2026

70.94%

Left on time

Within 15 minutes of schedule

0.75%

Cancelled

Share of departures

82 min

When late, late by

Average delayed departure

#100

Rank

Among graded US airports

What the record says about IAH

Departures from Houston run late more often than average — enough that a tight connection at the far end deserves a second look.

The airlines flying from here are not equally affected. Delta Air Lines left on time 9.3 points more often than Frontier Airlines from the same airport — which is the clearest evidence available that a delayed departure is not purely the airport's fault.

With 40 routes in the record, IAH is a hub, and hubs carry a particular risk: a delay early in the day propagates through every aircraft that was due to fly on afterwards. Morning departures from a hub are reliably better than evening ones.

Which airlines run best out of IAH

Airline Departures On time
Delta Air Lines 714 75.9%
British Airways 949 73.8%
American Airlines 756 69.6%
United Airlines 7,306 68.8%
SkyWest Airlines 1,274 68.4%
Frontier Airlines 585 66.6%

Routes out of IAH

IAH → LHR London 1,832 flights · 68.39% on time D IAH → ORD Chicago 525 flights · 68.75% on time D IAH → DFW Dallas/Fort Worth 464 flights · 64.57% on time F IAH → DEN Denver 431 flights · 71.66% on time C IAH → LAX Los Angeles 397 flights · 79.24% on time B IAH → ATL Atlanta 396 flights · 69.33% on time D IAH → LGA New York 340 flights · 71% on time D IAH → EWR Newark 300 flights · 70.03% on time C IAH → SFO San Francisco 300 flights · 57.19% on time F IAH → DCA Washington 280 flights · 63.24% on time F IAH → MIA Miami 277 flights · 75.09% on time C IAH → LAS Las Vegas 261 flights · 73.93% on time C IAH → MCO Orlando 257 flights · 74.22% on time C IAH → PHX Phoenix 235 flights · 67.95% on time D IAH → SEA Seattle 217 flights · 74.19% on time C IAH → MSY New Orleans 206 flights · 68.45% on time D IAH → AUS Austin 201 flights · 73.13% on time C IAH → CLT Charlotte 200 flights · 74.75% on time C IAH → BOS Boston 187 flights · 67.91% on time D IAH → PHL Philadelphia 187 flights · 65.76% on time D IAH → IAD Washington 180 flights · 72.63% on time C IAH → MSP Minneapolis 177 flights · 74.43% on time C IAH → DTW Detroit 173 flights · 73.84% on time C IAH → SAT San Antonio 171 flights · 69.01% on time D IAH → SAN San Diego 142 flights · 71.13% on time C IAH → SLC Salt Lake City 142 flights · 77.46% on time C IAH → SHV Shreveport 141 flights · 65.25% on time D IAH → BNA Nashville 131 flights · 63.08% on time D IAH → FLL Fort Lauderdale 130 flights · 68.22% on time D IAH → PDX Portland 115 flights · 73.68% on time C IAH → LIT Little Rock 108 flights · 66.67% on time D IAH → TPA Tampa 107 flights · 71.03% on time C IAH → BWI Baltimore 102 flights · 67.68% on time D IAH → SJU San Juan 90 flights · 84.44% on time — IAH → SNA Santa Ana 90 flights · 76.4% on time — IAH → MEM Memphis 90 flights · 79.78% on time — IAH → OKC Oklahoma City 90 flights · 70% on time — IAH → CLE Cleveland 86 flights · 72.09% on time — IAH → PIT Pittsburgh 82 flights · 79.27% on time — IAH → OMA Omaha 77 flights · 57.14% on time —