Airports › Houston (IAH) › May 2025
Airport month · May 2025
George Bush Intercontinental/Houston in May 2025
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In May 2025, reporting carriers scheduled 10,238 domestic departures from George Bush Intercontinental/Houston (IAH). 71.4% left less than 15 minutes late and 71.9% reached their destination on time; 1.3% were cancelled.
Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so IAH departures were 5.3 points below the national departure figure.
A year earlier, in May 2024, the airport had 10,125 departures with 60.3% leaving on time: a change of +11.1 points, with flights up 1%.
Flights arriving at IAH that month were on time 74.4% of the time (10,247 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 34%, air carrier 29% and national aviation system 26%.
- On time 71.9%
- Arrived 15+ minutes late 26.5%
- Cancelled 1.3%
- Diverted 0.3%
May 2025 against a year earlier, the airport's year and the nation
| Measure | May 2025 | May 2024 | IAH, 12 months to Jul 2026 | All reported flights, May 2025 |
|---|---|---|---|---|
| Departed on time | 71.4% | 60.3% | 78.1% | 76.7% |
| Arrived on time | 71.9% | 58.6% | 77.6% | 75.4% |
| Cancelled | 1.3% | 3.4% | 1.1% | 1.0% |
| Average departure delay (late minutes only) | 25.0 min | 39.7 min | 17.2 min | 17.5 min |
| Scheduled departures a day | 341 | 338 | 326 | 20,188 |
| Scheduled departures | 10,238 | 10,125 | 119,020 | 605,648 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 6,292 | 61% | 73.4% | 11.7 min | 1.0% |
| OO SkyWest Airlines | 1,274 | 12% | 67.0% | 25.8 min | 2.4% |
| AA American Airlines | 723 | 7% | 70.5% | 26.2 min | 2.4% |
| DL Delta Air Lines | 687 | 7% | 72.3% | 22.5 min | 0.4% |
| NK Spirit Airlines | 667 | 7% | 74.1% | 14.0 min | 1.0% |
| F9 Frontier Airlines | 314 | 3% | 57.0% | 45.1 min | 1.0% |
| MQ Envoy Air | 97 | 1% | 74.2% | 16.6 min | 3.1% |
| AS Alaska Airlines | 95 | 1% | 74.7% | 3.4 min | 2.1% |
| B6 JetBlue Airways | 84 | 1% | 65.5% | 16.5 min | 2.4% |
| OH PSA Airlines | 5 | 0% | 100.0% | -16.2 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAH–ORD | Houston to Chicago | 504 | 75.2% | 13.2 min | 1.0% |
| IAH–DFW | Houston to Dallas/Fort Worth | 502 | 65.9% | 30.6 min | 4.0% |
| IAH–LAX | Houston to Los Angeles | 448 | 78.1% | 12.1 min | 0.2% |
| IAH–ATL | Houston to Atlanta | 395 | 68.9% | 23.6 min | 0.8% |
| IAH–DEN | Houston to Denver | 374 | 73.5% | 20.5 min | 0.3% |
| IAH–LGA | Houston to New York | 367 | 67.8% | 19.6 min | 0.8% |
| IAH–MIA | Houston to Miami | 348 | 68.4% | 28.6 min | 1.4% |
| IAH–LAS | Houston to Las Vegas | 315 | 73.7% | 10.5 min | 1.3% |
| IAH–MCO | Houston to Orlando | 310 | 69.4% | 13.8 min | 1.0% |
| IAH–SFO | Houston to San Francisco | 303 | 76.9% | 3.7 min | 1.3% |
| IAH–PHX | Houston to Phoenix | 285 | 75.1% | 13.6 min | 0.7% |
| IAH–MSY | Houston to New Orleans | 264 | 70.8% | 11.7 min | 1.5% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left IAH on time in May 2025?
71.4% of 10,238 scheduled domestic departures left less than 15 minutes late, and 71.9% reached their destination on time. The national figures that month were 76.7% and 75.4%.
How does that compare with a year earlier?
In May 2024, 60.3% of 10,125 departures left on time and 3.4% were cancelled, against 71.4% and 1.3% in May 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for IAH · methodology · corrections.