Louisville Muhammad Ali International Airport (SDF) delays & on-time performance
Louisville, Kentucky · 46 nonstop destinations · 10 airlines · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SDF right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
On-time arrivals
82%
arrived < 15 min late
Cancelled
2.2%
516 flights
Avg arrival delay
16 min
84 min when late
Departed on time
82%
avg taxi-out 16 min
Figures cover 23,144 departures from SDF; on-time is measured at arrival. Arrivals into SDF were on time 78% of the time.
Key facts
- Flights departing Louisville Muhammad Ali International Airport (SDF) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 2.2% were cancelled, and 7% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (89% on time); Allegiant Air was the least (64%).
- Departures scheduled around 5am did best (94% on time); around 6pm did worst (70%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (36%).
Most delayed routes from SDF
Lowest on-time arrival rates among regularly flown routes.
- BOS · Boston71%708 flts
- DFW · Dallas/Fort Worth75%2,002 flts
- BNA · Nashville79%505 flts
- DCA · Washington79%1,029 flts
- ORD · Chicago80%2,796 flts
- MCO · Orlando81%856 flts
- MSP · Minneapolis82%527 flts
- MIA · Miami82%429 flts
- CLT · Charlotte82%1,757 flts
- PHX · Phoenix83%372 flts
Most reliable routes from SDF
Highest on-time arrival rates among regularly flown routes.
- ATL · Atlanta90%2,717 flts
- EWR · Newark87%992 flts
- BWI · Baltimore87%891 flts
- MDW · Chicago85%977 flts
- LAS · Las Vegas85%399 flts
- PHL · Philadelphia85%608 flts
- LGA · New York84%1,037 flts
- DEN · Denver84%1,097 flts
- DTW · Detroit83%1,128 flts
- TPA · Tampa83%406 flts
Best airline at SDF
Departures from this airport, ranked by on-time arrival.
| Airline | On time | Cancelled | Avg delay | Routes | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 89% | 1.6% | 10 min | 6 | 2,736 |
| Republic Airways | 85% | 2.8% | 11 min | 12 | 5,785 |
| United Airlines | 84% | 0.9% | 12 min | 7 | 749 |
| Southwest Airlines | 83% | 1.4% | 10 min | 15 | 5,270 |
| Spirit Airlines | 80% | 5.2% | 16 min | 7 | 366 |
| American Airlines | 78% | 2.7% | 28 min | 17 | 2,551 |
| PSA Airlines | 78% | 3.8% | 25 min | 5 | 1,965 |
| SkyWest Airlines | 77% | 2.3% | 25 min | 5 | 1,950 |
| Envoy Air | 76% | 1.5% | 17 min | 7 | 1,003 |
| Allegiant Air | 64% | 0.7% | 38 min | 9 | 769 |
Best time to fly out of SDF
On-time arrival rate by scheduled departure hour (local time).
- 5am94%801 flts
- 6am90%3,200 flts
- 7am89%2,364 flts
- 8am89%1,349 flts
- 9am88%929 flts
- 10am87%1,694 flts
- 11am84%1,304 flts
- 12pm81%1,490 flts
- 1pm80%1,497 flts
- 2pm77%1,159 flts
- 3pm77%1,572 flts
- 4pm71%1,206 flts
- 5pm71%1,534 flts
- 6pm70%1,274 flts
- 7pm73%1,100 flts
- 8pm71%513 flts
Monthly trend
Why departures were late
- Airline (crew, maintenance, cleaning, fueling)36%
- Late-arriving aircraft36%
- Air traffic control & airport congestion23%
- Extreme weather5%
- Security0%
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.