Skip to content
WanderNerd
Check a flight

Airport Reliability

IAH · Houston

George Bush Intercontinental Airport

80%
Departures within 15 minutes
14 min
Average departure delay
82%
Arrivals within 15 minutes
1.3%
Departures cancelled

Based on 171,808 departures and 171,800 arrivals. Data through May 2026.

What the data says

Morning flights do better here.

Departures from IAH departing between 3–6 AM arrived on time 90% of the time, versus 74% between 6–9 PM.

Sunday scaries are real for this one.

Departures from IAH arrived on time 84% of the time on Tuesdays. On Sundays: 77%.

Slipping a little lately.

Departures from IAH arrived on time 80% of the time over the last three months in the data, compared with 85% in the three months before that.

When IAH gets messy

On-time by departure window
  • 12–3 AM—(8 flights)
  • 3–6 AM90%(3127 flights)
  • 6–9 AM88%(24783 flights)
  • 9 AM–12 PM84%(28559 flights)
  • 12–3 PM81%(40193 flights)
  • 3–6 PM75%(20743 flights)
  • 6–9 PM74%(44791 flights)
  • 9 PM–12 AM80%(6863 flights)
On-time by weekday
  • Mon78%(24968 flights)
  • Tue84%(22999 flights)
  • Wed83%(23812 flights)
  • Thu80%(24986 flights)
  • Fri79%(25056 flights)
  • Sat80%(22112 flights)
  • Sun77%(25134 flights)
On-time trend by month
80%
May

Jun 66% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202566%14057
July 202572%14611
August 202576%14359
September 202588%13759
October 202583%14754
November 202580%14241
December 202581%14421
January 202686%13290
February 202688%12531
March 202679%14358
April 202682%14175
May 202680%14511

Airlines departing IAH

Busiest routes from IAH

Based on 171,808 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.