Airlines › Delta Air Lines › May 2025
Carrier month · May 2025
Delta Air Lines 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, Delta Air Lines (DL) reported 89,931 scheduled domestic flights. 77.6% arrived on time, 0.2% were cancelled and 0.3% diverted.
All reporting carriers together recorded 75.4% on time and 1.0% cancelled that month, so the carrier was 2.2 points above the combined figure.
A year earlier, in May 2024, it reported 88,381 flights with 78.3% on time: a change of −0.7 points.
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 40%, late-arriving aircraft 32% and national aviation system 24%.
- On time 77.6%
- Arrived 15+ minutes late 21.9%
- Cancelled 0.2%
- Diverted 0.3%
May 2025 against a year earlier, the carrier's year and all carriers
| Measure | May 2025 | May 2024 | DL, 12 months to Jul 2026 | All carriers, May 2025 |
|---|---|---|---|---|
| Arrived on time | 77.6% | 78.3% | 79.9% | 75.4% |
| Departed on time | 78.8% | 79.7% | 80.6% | 76.7% |
| Cancelled | 0.2% | 0.2% | 1.7% | 1.0% |
| Average arrival delay | 8.0 min | 8.4 min | 3.9 min | 10.2 min |
| Scheduled flights a day | 2,998 | 2,946 | 2,846 | 20,188 |
| Scheduled flights | 89,931 | 88,381 | 1,038,644 | 605,648 |
144 airports and 917 routes had DL flights that month.
Busiest airports that month
| Airport | Departures | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|
| ATL Atlanta | 20,715 | 71.6% | 12.9 min | 0.1% |
| MSP Minneapolis | 5,996 | 79.9% | 6.4 min | 0.2% |
| DTW Detroit | 5,268 | 79.1% | 6.0 min | 0.1% |
| SLC Salt Lake City | 4,753 | 81.6% | 3.2 min | 0.0% |
| LAX Los Angeles | 3,272 | 81.3% | 2.3 min | 0.1% |
| SEA Seattle | 2,752 | 83.1% | -0.1 min | 0.1% |
| JFK New York | 2,656 | 76.7% | 4.1 min | 0.2% |
| LGA New York | 2,459 | 69.5% | 19.6 min | 1.1% |
| BOS Boston | 2,272 | 73.5% | 10.6 min | 0.4% |
| MCO Orlando | 1,768 | 71.0% | 18.6 min | 0.2% |
| LAS Las Vegas | 1,444 | 81.5% | 3.4 min | 0.1% |
| TPA Tampa | 1,169 | 79.0% | 6.3 min | 0.1% |
| SFO San Francisco | 1,140 | 79.6% | 4.2 min | 0.1% |
| ORD Chicago | 1,105 | 74.0% | 16.0 min | 0.8% |
| FLL Fort Lauderdale | 1,078 | 73.4% | 11.2 min | 0.3% |
By scheduled departure hour
Delay causes
Questions and answers
What share of Delta Air Lines flights were on time in May 2025?
77.6% of 89,931 scheduled domestic flights arrived less than 15 minutes late; all reporting carriers together recorded 75.4% that month.
How does that compare with a year earlier?
In May 2024 the carrier reported 88,381 flights with 78.3% on time and 0.2% cancelled, against 77.6% and 0.2% in May 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 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.