Airlines › Delta Air Lines › August 2025
Carrier month · August 2025
Delta Air Lines in August 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 August 2025, Delta Air Lines (DL) reported 90,313 scheduled domestic flights. 82.1% arrived on time, 0.8% were cancelled and 0.3% diverted.
All reporting carriers together recorded 76.3% on time and 1.1% cancelled that month, so the carrier was 5.8 points above the combined figure.
A year earlier, in August 2024, it reported 90,397 flights with 79.9% on time: a change of +2.2 points.
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 47%, late-arriving aircraft 30% and national aviation system 18%.
- On time 82.1%
- Arrived 15+ minutes late 16.8%
- Cancelled 0.8%
- Diverted 0.3%
August 2025 against a year earlier, the carrier's year and all carriers
| Measure | Aug 2025 | Aug 2024 | DL, 12 months to Jul 2026 | All carriers, Aug 2025 |
|---|---|---|---|---|
| Arrived on time | 82.1% | 79.9% | 79.9% | 76.3% |
| Departed on time | 82.0% | 79.7% | 80.6% | 76.8% |
| Cancelled | 0.8% | 0.8% | 1.7% | 1.1% |
| Average arrival delay | 2.8 min | 6.0 min | 3.9 min | 9.2 min |
| Scheduled flights a day | 3,010 | 3,013 | 2,846 | 20,079 |
| Scheduled flights | 90,313 | 90,397 | 1,038,644 | 602,378 |
144 airports and 929 routes had DL flights that month.
Busiest airports that month
| Airport | Departures | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|
| ATL Atlanta | 20,844 | 79.3% | 5.1 min | 0.7% |
| MSP Minneapolis | 6,181 | 81.6% | 3.3 min | 0.3% |
| DTW Detroit | 5,180 | 81.2% | 4.7 min | 0.5% |
| SLC Salt Lake City | 4,648 | 82.2% | 4.1 min | 0.2% |
| LAX Los Angeles | 3,211 | 83.7% | 0.5 min | 0.5% |
| SEA Seattle | 2,919 | 81.0% | 3.2 min | 0.3% |
| JFK New York | 2,654 | 83.5% | -3.6 min | 0.8% |
| LGA New York | 2,485 | 80.1% | 4.0 min | 1.6% |
| BOS Boston | 2,294 | 83.0% | 1.8 min | 0.7% |
| MCO Orlando | 1,637 | 72.8% | 17.6 min | 1.0% |
| LAS Las Vegas | 1,288 | 85.0% | -1.6 min | 0.7% |
| SFO San Francisco | 1,204 | 83.3% | 0.4 min | 0.6% |
| AUS Austin | 1,112 | 80.9% | 6.1 min | 0.5% |
| TPA Tampa | 1,084 | 79.2% | 2.8 min | 0.8% |
| ORD Chicago | 1,075 | 78.2% | 12.0 min | 1.2% |
By scheduled departure hour
Delay causes
Questions and answers
What share of Delta Air Lines flights were on time in August 2025?
82.1% of 90,313 scheduled domestic flights arrived less than 15 minutes late; all reporting carriers together recorded 76.3% that month.
How does that compare with a year earlier?
In August 2024 the carrier reported 90,397 flights with 79.9% on time and 0.8% cancelled, against 82.1% and 0.8% in August 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 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.