Airlines › United Airlines › December 2025
Carrier month · December 2025
United Airlines in December 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 December 2025, United Airlines (UA) reported 65,865 scheduled domestic flights. 76.8% arrived on time, 0.4% were cancelled and 0.2% diverted.
All reporting carriers together recorded 71.9% on time and 1.5% cancelled that month, so the carrier was 4.9 points above the combined figure.
A year earlier, in December 2024, it reported 64,030 flights with 80.6% on time: a change of −3.8 points.
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 39%, national aviation system 31% and air carrier 26%.
- On time 76.8%
- Arrived 15+ minutes late 22.6%
- Cancelled 0.4%
- Diverted 0.2%
December 2025 against a year earlier, the carrier's year and all carriers
| Measure | Dec 2025 | Dec 2024 | UA, 12 months to Jul 2026 | All carriers, Dec 2025 |
|---|---|---|---|---|
| Arrived on time | 76.8% | 80.6% | 78.2% | 71.9% |
| Departed on time | 78.8% | 81.3% | 80.6% | 72.0% |
| Cancelled | 0.4% | 0.5% | 1.0% | 1.5% |
| Average arrival delay | 7.9 min | 4.3 min | 6.3 min | 13.0 min |
| Scheduled flights a day | 2,196 | 2,134 | 2,262 | 19,410 |
| Scheduled flights | 65,865 | 64,030 | 825,693 | 582,304 |
122 airports and 845 routes had UA flights that month.
Busiest airports that month
| Airport | Departures | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|
| DEN Denver | 8,548 | 77.4% | 7.1 min | 0.2% |
| ORD Chicago | 7,305 | 67.3% | 17.6 min | 0.2% |
| IAH Houston | 6,317 | 82.1% | 1.4 min | 0.1% |
| EWR Newark | 5,996 | 71.2% | 12.7 min | 1.0% |
| SFO San Francisco | 4,916 | 80.3% | 3.5 min | 0.2% |
| IAD Washington | 2,867 | 78.1% | 5.8 min | 0.1% |
| LAX Los Angeles | 2,465 | 79.5% | 3.6 min | 0.1% |
| MCO Orlando | 1,347 | 81.5% | 2.2 min | 0.4% |
| LAS Las Vegas | 1,285 | 84.0% | -1.7 min | 0.1% |
| PHX Phoenix | 973 | 85.3% | 1.0 min | 0.5% |
| BOS Boston | 970 | 77.3% | 7.2 min | 0.3% |
| FLL Fort Lauderdale | 924 | 78.6% | 6.5 min | 0.8% |
| AUS Austin | 871 | 80.0% | 5.8 min | 0.5% |
| SAN San Diego | 842 | 80.5% | 4.2 min | 0.4% |
| TPA Tampa | 828 | 79.7% | 5.0 min | 0.4% |
By scheduled departure hour
Delay causes
Questions and answers
What share of United Airlines flights were on time in December 2025?
76.8% of 65,865 scheduled domestic flights arrived less than 15 minutes late; all reporting carriers together recorded 71.9% that month.
How does that compare with a year earlier?
In December 2024 the carrier reported 64,030 flights with 80.6% on time and 0.5% cancelled, against 76.8% and 0.4% in December 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 2025; public domain. Domestic scheduled flights, totals and averages only. The site's data runs through July 2026. Full record for United Airlines · methodology · corrections.