Airport reliability
Louisville (SDF) on-time performance
How reliably flights leave Louisville, KY (SDF) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.
Louisville, KY23,065 departures in 12 months
- Departures on time
- 79.5% U.S. average 75.6%
- Cancelled
- 2.3% U.S. average 1.9%
- 60+ minutes late
- 6.8% U.S. average 8.1%
- Scheduled departures
- 23,065 12 months
What this means
SDF departures beat the U.S. average.
- 79.5% of the 23,065 scheduled departures from Louisville (SDF) arrived at their destination on time, 3.9 points higher than the U.S. average of 75.6%.
- 2.3% of departures were cancelled (U.S. average 1.9%), and 6.8% arrived an hour or more late.
- Flights arriving at SDF were on time 75.4% of the time.
- Among airlines with at least 300 departures, Delta Air Lines was the most punctual from SDF (87.7%) and Allegiant Air the least (62.4%).
- Over the last 3 years, October was the most reliable month for departures from SDF (86.5% on time) and July the least reliable (74.5%).
- Cancellations peaked in January, when 5.0% of flights were cancelled.
- Flights scheduled to depart before 6 am were the most punctual (92.1% on time); flights scheduled to depart 9 pm to 10 pm were the least (43.4%).
Airlines at SDF
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Departures |
|---|---|---|---|---|---|
| Delta Air Lines | 87.7% | 1.5% | 4.7% | 89 min | 2,729 |
| United Airlines | 83.0% | 0.9% | 5.9% | 70 min | 749 |
| Republic AirwaysSold as American Eagle, Delta Connection, United Express | 81.8% | 3.1% | 5.7% | 66 min | 5,916 |
| Southwest Airlines | 81.3% | 1.4% | 4.5% | 56 min | 5,313 |
| American Airlines | 76.3% | 2.6% | 8.9% | 116 min | 2,573 |
| Envoy AirSold as American Eagle | 75.5% | 1.2% | 8.9% | 66 min | 989 |
| PSA AirlinesSold as American Eagle | 74.2% | 4.2% | 8.4% | 109 min | 1,899 |
| SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska | 74.2% | 2.1% | 9.7% | 108 min | 1,831 |
| Spirit Airlines | 74.0% | 6.5% | 9.2% | 82 min | 292 |
| Allegiant Air | 62.4% | 0.9% | 18.2% | 117 min | 774 |
Tap a heading to sort.
On-time rate by departure hour
Share of scheduled flights on time SDF average 79.5%
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing before 6 am | 92.1% | 806 |
| Departing 6 am to 7 am | 88.4% | 3,212 |
| Departing 7 am to 8 am | 87.2% | 2,332 |
| Departing 8 am to 9 am | 88.3% | 1,377 |
| Departing 9 am to 10 am | 85.4% | 936 |
| Departing 10 am to 11 am | 84.9% | 1,660 |
| Departing 11 am to noon | 82.2% | 1,457 |
| Departing noon to 1 pm | 78.1% | 1,338 |
| Departing 1 pm to 2 pm | 77.6% | 1,520 |
| Departing 2 pm to 3 pm | 74.0% | 1,167 |
| Departing 3 pm to 4 pm | 74.0% | 1,561 |
| Departing 4 pm to 5 pm | 67.5% | 1,212 |
| Departing 5 pm to 6 pm | 69.2% | 1,566 |
| Departing 6 pm to 7 pm | 67.6% | 1,249 |
| Departing 7 pm to 8 pm | 70.0% | 1,034 |
| Departing 8 pm to 9 pm | 68.9% | 485 |
| Departing 9 pm to 10 pm | 43.4% | 152 |
| Departing 10 pm to 11 pm | Insufficient sample | 1 |
Best and worst months at SDF
Share of scheduled flights on time 12-month average 79.5%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | 75.3% | 5,034 |
| February | 81.2% | 4,852 |
| March | 80.8% | 5,939 |
| April | 81.7% | 6,132 |
| May | 78.0% | 6,724 |
| June | 76.4% | 6,282 |
| July | 74.5% | 6,374 |
| August | 80.8% | 6,100 |
| September | 84.9% | 5,993 |
| October | 86.5% | 6,412 |
| November | 84.7% | 5,520 |
| December | 81.6% | 5,363 |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 87.1% | 1,929 |
| Oct 2025 | 83.3% | 2,089 |
| Nov 2025 | 78.5% | 1,731 |
| Dec 2025 | 73.7% | 1,686 |
| Jan 2026 | 79.3% | 1,578 |
| Feb 2026 | 81.0% | 1,594 |
| Mar 2026 | 75.8% | 2,009 |
| Apr 2026 | 80.9% | 2,136 |
| May 2026 | 82.5% | 2,304 |
| Jun 2026 | 75.4% | 2,012 |
| Jul 2026 | 75.4% | 2,015 |
| Aug 2026 | 80.5% | 1,982 |
Busiest routes from SDF
| To | On time | Cancelled | Airlines | Flights |
|---|---|---|---|---|
| Chicago (ORD) | 77.0% | 2.7% | 6 | 2,795 |
| Atlanta (ATL) | 88.0% | 1.5% | 1 | 2,710 |
| Dallas/Fort Worth (DFW) | 73.4% | 3.1% | 4 | 1,994 |
| Charlotte (CLT) | 80.3% | 2.5% | 3 | 1,753 |
| Denver (DEN) | 82.8% | 1.0% | 2 | 1,096 |
| Detroit (DTW) | 81.9% | 1.0% | 3 | 1,089 |
| New York (LGA) | 78.9% | 4.5% | 2 | 1,034 |
| Washington (DCA) | 74.4% | 4.6% | 4 | 1,025 |
| Newark (EWR) | 82.7% | 4.7% | 3 | 1,019 |
| Chicago (MDW) | 82.3% | 1.6% | 1 | 976 |
| Baltimore (BWI) | 84.7% | 1.8% | 1 | 880 |
| Orlando (MCO) | 78.5% | 1.8% | 3 | 865 |
| Boston (BOS) | 69.3% | 2.1% | 3 | 709 |
| Philadelphia (PHL) | 81.9% | 2.7% | 3 | 634 |
| Nashville (BNA) | 78.1% | 0.9% | 1 | 544 |
| Minneapolis (MSP) | 79.2% | 1.2% | 1 | 481 |
| Miami (MIA) | 84.3% | 1.7% | 3 | 407 |
| Tampa (TPA) | 80.5% | 2.0% | 1 | 405 |
| Las Vegas (LAS) | 82.7% | 0.8% | 3 | 399 |
| Phoenix (PHX) | 82.4% | 1.1% | 2 | 369 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Scheduled nonstop domestic departures from Louisville, KY (SDF) by airlines that report to the DOT.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.