Airports › Louisville (SDF) › December 2025
Airport month · December 2025
Louisville Muhammad Ali International 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, reporting carriers scheduled 1,686 domestic departures from Louisville Muhammad Ali International (SDF). 75.4% left less than 15 minutes late and 73.7% reached their destination on time; 1.8% were cancelled.
Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so SDF departures were 3.4 points above the national departure figure.
A year earlier, in December 2024, the airport had 1,811 departures with 83.0% leaving on time: a change of −7.6 points, with flights down 7%.
Flights arriving at SDF that month were on time 68.6% of the time (1,684 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 39%, air carrier 32% and national aviation system 25%.
- On time 73.7%
- Arrived 15+ minutes late 24.4%
- Cancelled 1.8%
- Diverted 0.1%
December 2025 against a year earlier, the airport's year and the nation
| Measure | Dec 2025 | Dec 2024 | SDF, 12 months to Jul 2026 | All reported flights, Dec 2025 |
|---|---|---|---|---|
| Departed on time | 75.4% | 83.0% | 80.0% | 72.0% |
| Arrived on time | 73.7% | 81.9% | 79.7% | 71.9% |
| Cancelled | 1.8% | 0.4% | 2.2% | 1.5% |
| Average departure delay (late minutes only) | 20.0 min | 13.9 min | 15.9 min | 21.2 min |
| Scheduled departures a day | 56 | 60 | 63 | 19,410 |
| Scheduled departures | 1,686 | 1,811 | 23,144 | 582,304 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| YX Republic Airline | 472 | 28% | 74.8% | 8.6 min | 2.1% |
| WN Southwest Airlines | 415 | 25% | 77.8% | 5.4 min | 0.2% |
| AA American Airlines | 240 | 14% | 70.8% | 16.1 min | 0.0% |
| DL Delta Air Lines | 216 | 13% | 81.5% | 0.5 min | 3.7% |
| OH PSA Airlines | 139 | 8% | 69.1% | 21.8 min | 5.0% |
| UA United Airlines | 62 | 4% | 71.0% | 11.0 min | 0.0% |
| G4 Allegiant Air | 61 | 4% | 63.9% | 13.7 min | 0.0% |
| OO SkyWest Airlines | 59 | 3% | 54.2% | 56.0 min | 1.7% |
| NK Spirit Airlines | 22 | 1% | 45.5% | 21.0 min | 18.2% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| SDF–ATL | Louisville to Atlanta | 216 | 81.5% | 0.5 min | 3.7% |
| SDF–ORD | Louisville to Chicago | 179 | 74.3% | 14.7 min | 2.2% |
| SDF–DFW | Louisville to Dallas/Fort Worth | 153 | 66.0% | 34.5 min | 0.7% |
| SDF–CLT | Louisville to Charlotte | 145 | 73.8% | 8.2 min | 1.4% |
| SDF–DEN | Louisville to Denver | 93 | 68.8% | 13.9 min | 0.0% |
| SDF–LGA | Louisville to New York | 90 | 70.0% | 7.4 min | 1.1% |
| SDF–DTW | Louisville to Detroit | 88 | 63.6% | 37.8 min | 1.1% |
| SDF–MDW | Louisville to Chicago | 78 | 78.2% | 5.3 min | 0.0% |
| SDF–EWR | Louisville to Newark | 75 | 69.3% | 4.3 min | 5.3% |
| SDF–MCO | Louisville to Orlando | 74 | 70.3% | 8.6 min | 0.0% |
| SDF–BWI | Louisville to Baltimore | 66 | 84.8% | -2.0 min | 1.5% |
| SDF–DCA | Louisville to Washington | 63 | 69.8% | 7.4 min | 6.3% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left SDF on time in December 2025?
75.4% of 1,686 scheduled domestic departures left less than 15 minutes late, and 73.7% reached their destination on time. The national figures that month were 72.0% and 71.9%.
How does that compare with a year earlier?
In December 2024, 83.0% of 1,811 departures left on time and 0.4% were cancelled, against 75.4% and 1.8% in December 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 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.