Airlines › Delta Air Lines › December 2025
Carrier month · December 2025
Delta Air Lines 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, Delta Air Lines (DL) reported 85,139 scheduled domestic flights. 72.3% arrived on time, 2.7% 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 level with the combined figure.
A year earlier, in December 2024, it reported 83,283 flights with 80.1% on time: a change of −7.8 points.
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 43%, late-arriving aircraft 33% and national aviation system 20%.
- On time 72.3%
- Arrived 15+ minutes late 24.8%
- Cancelled 2.7%
- Diverted 0.2%
December 2025 against a year earlier, the carrier's year and all carriers
| Measure | Dec 2025 | Dec 2024 | DL, 12 months to Jul 2026 | All carriers, Dec 2025 |
|---|---|---|---|---|
| Arrived on time | 72.3% | 80.1% | 79.9% | 71.9% |
| Departed on time | 72.7% | 80.0% | 80.6% | 72.0% |
| Cancelled | 2.7% | 0.1% | 1.7% | 1.5% |
| Average arrival delay | 11.3 min | 4.3 min | 3.9 min | 13.0 min |
| Scheduled flights a day | 2,838 | 2,776 | 2,846 | 19,410 |
| Scheduled flights | 85,139 | 83,283 | 1,038,644 | 582,304 |
143 airports and 944 routes had DL flights that month.
Busiest airports that month
| Airport | Departures | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|
| ATL Atlanta | 19,422 | 72.4% | 11.0 min | 2.5% |
| MSP Minneapolis | 5,203 | 63.2% | 17.3 min | 2.3% |
| DTW Detroit | 4,936 | 61.7% | 21.7 min | 2.2% |
| SLC Salt Lake City | 4,569 | 80.3% | 0.6 min | 1.1% |
| LAX Los Angeles | 3,049 | 77.5% | 7.1 min | 1.6% |
| SEA Seattle | 2,651 | 71.5% | 10.6 min | 2.3% |
| JFK New York | 2,639 | 63.5% | 17.6 min | 4.9% |
| LGA New York | 2,583 | 56.3% | 23.2 min | 7.4% |
| BOS Boston | 2,241 | 65.1% | 18.2 min | 2.6% |
| MCO Orlando | 1,915 | 71.3% | 14.9 min | 2.6% |
| LAS Las Vegas | 1,306 | 84.8% | -1.4 min | 1.3% |
| TPA Tampa | 1,227 | 70.3% | 14.2 min | 3.1% |
| FLL Fort Lauderdale | 1,188 | 68.6% | 15.4 min | 3.4% |
| SFO San Francisco | 1,099 | 75.9% | 8.0 min | 2.2% |
| AUS Austin | 1,076 | 80.5% | 5.0 min | 1.6% |
By scheduled departure hour
Delay causes
Questions and answers
What share of Delta Air Lines flights were on time in December 2025?
72.3% of 85,139 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 83,283 flights with 80.1% on time and 0.1% cancelled, against 72.3% and 2.7% 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 Delta Air Lines · methodology · corrections.