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Airport · 12 months to July 2026
Louisville Muhammad Ali International: delays and on-time record
Louisville, Kentucky
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. Data through July 2026; this is a monthly history, not live airport status.
Louisville Muhammad Ali International (SDF) in Louisville, Kentucky had 23,144 scheduled domestic departures by reporting carriers in the 12 months to July 2026, about 63 a day, on 46 routes.
80.0% of those flights left the gate less than 15 minutes late, 3.9 points above the national departure figure of 76.1%. Flights arriving at SDF were on time 75.8% of the time, level with the national arrival figure of 76.0%.
2.2% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 15.9 min.
Republic Airline is the largest reporting carrier at SDF with 25% of departures. Among carriers with at least 231 departures, Delta Air Lines had the highest on-time arrival share for its SDF departures (87.9%) and Allegiant Air the lowest (63.8%).
On-time departures are down 2.0 points on the previous 12 months (82.0%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving SDF, air carrier 36%, late-arriving aircraft 36% and national aviation system 23%.
- On time 79.7%
- Arrived 15+ minutes late 17.8%
- Cancelled 2.2%
- Diverted 0.3%
As origin and as destination, against the nation
| Measure | Departures from SDF | Arrivals at SDF | All reported flights | SDF departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 80.0% | 75.2% | 76.1% | 82.0% |
| Arrived on time | 79.7% | 75.8% | 76.0% | 80.2% |
| Cancelled | 2.2% | 2.3% | 1.8% | 1.7% |
| Diverted | 0.3% | 0.1% | 0.3% | 0.2% |
| Average departure delay (late minutes only) | 15.9 min | 16.5 min | 17.4 min | 14.8 min |
| Arrival delay minutes per 100 flights | 1,568 | 1,585 | 1,684 | 1,528 |
| Scheduled flights | 23,144 | 23,143 | 7,043,858 | 23,519 |
12 months to July 2026. The first column follows flights that left SDF; the second follows flights that landed there. Year on year, on-time departures moved −2.0 pts.
Airlines at SDF
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| YX Republic Airline | 5,785 | 25% | 82.3% | -0.9 min | 2.8% |
| WN Southwest Airlines | 5,270 | 23% | 81.5% | 1.7 min | 1.4% |
| DL Delta Air Lines | 2,736 | 12% | 87.9% | -6.8 min | 1.6% |
| AA American Airlines | 2,551 | 11% | 75.5% | 15.9 min | 2.7% |
| OH PSA Airlines | 1,965 | 8% | 74.6% | 13.0 min | 3.8% |
| OO SkyWest Airlines | 1,950 | 8% | 74.8% | 14.9 min | 2.3% |
| MQ Envoy Air | 1,003 | 4% | 74.6% | 8.2 min | 1.5% |
| G4 Allegiant Air | 769 | 3% | 63.8% | 29.8 min | 0.7% |
| UA United Airlines | 749 | 3% | 82.4% | 0.8 min | 0.9% |
| NK Spirit Airlines | 366 | 2% | 75.4% | 4.0 min | 5.2% |
Departures from SDF by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 79.7%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from SDF
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| SDF–ORD | Louisville to Chicago | 2,796 | 77.2% | 5.8 min | 2.9% |
| SDF–ATL | Louisville to Atlanta | 2,717 | 88.2% | -7.1 min | 1.6% |
| SDF–DFW | Louisville to Dallas/Fort Worth | 2,002 | 71.8% | 18.5 min | 3.5% |
| SDF–CLT | Louisville to Charlotte | 1,757 | 80.7% | 7.4 min | 2.1% |
| SDF–DTW | Louisville to Detroit | 1,128 | 82.2% | 10.8 min | 0.9% |
| SDF–DEN | Louisville to Denver | 1,097 | 82.3% | 1.3 min | 1.0% |
| SDF–LGA | Louisville to New York | 1,037 | 79.8% | -2.0 min | 4.1% |
| SDF–DCA | Louisville to Washington | 1,029 | 75.4% | 9.6 min | 4.2% |
| SDF–EWR | Louisville to Newark | 992 | 82.7% | -3.4 min | 4.3% |
| SDF–MDW | Louisville to Chicago | 977 | 83.2% | 0.8 min | 1.7% |
| SDF–BWI | Louisville to Baltimore | 891 | 84.8% | -0.1 min | 1.9% |
| SDF–MCO | Louisville to Orlando | 856 | 78.7% | 3.5 min | 1.9% |
| SDF–BOS | Louisville to Boston | 708 | 69.8% | 10.7 min | 2.1% |
| SDF–PHL | Louisville to Philadelphia | 608 | 83.1% | -1.2 min | 2.0% |
| SDF–MSP | Louisville to Minneapolis | 527 | 80.6% | 6.4 min | 1.1% |
| SDF–BNA | Louisville to Nashville | 505 | 78.0% | 6.1 min | 1.0% |
| SDF–MIA | Louisville to Miami | 429 | 80.9% | 13.4 min | 1.6% |
| SDF–TPA | Louisville to Tampa | 406 | 80.8% | 1.7 min | 2.0% |
| SDF–LAS | Louisville to Las Vegas | 399 | 84.0% | 3.7 min | 0.8% |
| SDF–PHX | Louisville to Phoenix | 372 | 81.2% | -1.3 min | 1.1% |
| SDF–DAL | Louisville to Dallas | 350 | 81.7% | -1.7 min | 0.6% |
| SDF–FLL | Louisville to Fort Lauderdale | 296 | 60.1% | 23.4 min | 4.7% |
| SDF–HOU | Louisville to Houston | 283 | 80.2% | 0.1 min | 0.7% |
| SDF–IAD | Louisville to Washington | 236 | 92.8% | -3.4 min | 0.4% |
| SDF–PGD | Louisville to Punta Gorda | 155 | 73.5% | 10.1 min | 1.3% |
| SDF–VPS | Louisville to Valparaiso | 130 | 69.2% | 9.9 min | 0.0% |
| SDF–SFB | Louisville to Sanford | 127 | 47.2% | 65.4 min | 1.6% |
The 27 busiest of 46 routes with reported flights. Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Among hours with at least 463 departures, 5 am to 6 am had the highest on-time share (92.0% of 801 flights) and 8 pm to 9 pm the lowest (64.3% of 513).
Delay causes
Cancellations by reported reason (516 in the period): air carrier 21%, weather 61%, national aviation system 18%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for SDF on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave SDF on time?
80.0% of the 23,144 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 2.2% were cancelled.
How often do flights arrive at SDF on time?
75.8% of 23,143 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at SDF?
Counting departures from SDF and whether they reached their destination on time, Delta Air Lines had the highest share (87.9% of 2,736 flights), then United Airlines (82.4%) and Republic Airline (82.3%). Carriers fly different routes at different hours, so the figures are not a like-for-like test.
What causes delays at SDF?
For departures from SDF that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: air carrier 36%, late-arriving aircraft 36%, national aviation system 23%, extreme weather 5%, security 0%.
What time of day has the highest on-time share at SDF?
Departures scheduled from 5 am to 6 am local time left on time 92.0% of the time, the highest of any hour with enough flights to compare; 8 pm to 9 pm was lowest at 64.3%.
Is it getting better?
On-time departures for the 12 months to July 2026 were 80.0%, down 2.0 points on the previous 12 months (82.0%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at SDF?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.