Airports › Louisville (SDF) › May 2025
Airport month · May 2025
Louisville Muhammad Ali International 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 2,125 domestic departures from Louisville Muhammad Ali International (SDF). 78.0% left less than 15 minutes late and 77.9% reached their destination on time; 1.2% were cancelled.
Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so SDF departures were 1.3 points above the national departure figure.
A year earlier, in May 2024, the airport had 2,295 departures with 75.9% leaving on time: a change of +2.1 points, with flights down 7%.
Flights arriving at SDF that month were on time 74.6% of the time (2,123 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 38%, national aviation system 30% and air carrier 26%.
- On time 77.9%
- Arrived 15+ minutes late 20.7%
- Cancelled 1.2%
- Diverted 0.2%
May 2025 against a year earlier, the airport's year and the nation
| Measure | May 2025 | May 2024 | SDF, 12 months to Jul 2026 | All reported flights, May 2025 |
|---|---|---|---|---|
| Departed on time | 78.0% | 75.9% | 80.0% | 76.7% |
| Arrived on time | 77.9% | 73.6% | 79.7% | 75.4% |
| Cancelled | 1.2% | 1.4% | 2.2% | 1.0% |
| Average departure delay (late minutes only) | 16.7 min | 19.5 min | 15.9 min | 17.5 min |
| Scheduled departures a day | 71 | 77 | 63 | 20,188 |
| Scheduled departures | 2,125 | 2,295 | 23,144 | 605,648 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| YX Republic Airline | 506 | 24% | 80.6% | 9.4 min | 1.2% |
| WN Southwest Airlines | 430 | 20% | 79.8% | 4.7 min | 0.7% |
| AA American Airlines | 304 | 14% | 74.0% | 9.6 min | 1.6% |
| DL Delta Air Lines | 229 | 11% | 84.3% | 1.2 min | 0.0% |
| OO SkyWest Airlines | 181 | 9% | 77.9% | 9.3 min | 0.6% |
| OH PSA Airlines | 123 | 6% | 61.8% | 26.1 min | 5.7% |
| NK Spirit Airlines | 104 | 5% | 84.6% | -0.2 min | 1.0% |
| MQ Envoy Air | 88 | 4% | 78.4% | 7.3 min | 1.1% |
| UA United Airlines | 87 | 4% | 73.6% | 10.3 min | 1.1% |
| G4 Allegiant Air | 73 | 3% | 67.1% | 19.4 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| SDF–ATL | Louisville to Atlanta | 254 | 83.9% | 1.8 min | 0.0% |
| SDF–ORD | Louisville to Chicago | 214 | 87.4% | -1.5 min | 0.5% |
| SDF–DFW | Louisville to Dallas/Fort Worth | 193 | 68.4% | 14.4 min | 2.1% |
| SDF–CLT | Louisville to Charlotte | 150 | 72.0% | 10.2 min | 2.0% |
| SDF–LGA | Louisville to New York | 139 | 81.3% | 7.5 min | 1.4% |
| SDF–DTW | Louisville to Detroit | 118 | 81.4% | 9.4 min | 0.0% |
| SDF–DEN | Louisville to Denver | 98 | 77.6% | 4.0 min | 1.0% |
| SDF–DCA | Louisville to Washington | 90 | 71.1% | 20.0 min | 5.6% |
| SDF–MDW | Louisville to Chicago | 88 | 88.6% | -0.9 min | 1.1% |
| SDF–MCO | Louisville to Orlando | 83 | 81.9% | 1.4 min | 0.0% |
| SDF–BWI | Louisville to Baltimore | 80 | 83.8% | -1.3 min | 1.3% |
| SDF–BOS | Louisville to Boston | 66 | 57.6% | 20.0 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left SDF on time in May 2025?
78.0% of 2,125 scheduled domestic departures left less than 15 minutes late, and 77.9% 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, 75.9% of 2,295 departures left on time and 1.4% were cancelled, against 78.0% and 1.2% 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 SDF · methodology · corrections.