Philadelphia (PHL) to Louisville (SDF): On-Time Performance
Data through May 2026
Philadelphia (PHL) to Louisville (SDF) effectively runs on two schedules. In May 2026, 89% of arrivals were on time; in June 2025 that fell to 55% — a 34-point seasonal swing. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 76%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 19 min
- completed flights
- Cancelled
- 2.7%
- Flights/day
- 1.6
- last 12 months
- Duration
- 2h 14m
- scheduled
- Distance
- 577 mi
Best airline from PHL to SDF
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| PSA Airlinesmost reliable | 81% | 22 min | 2.1% | 426 |
| Republic Airways | 78% | 16 min | 3.3% | 546 |
Monthly on-time trend
Best time to fly from PHL to SDF
Aim for departures around 8 p.m. (89% on-time); avoid 6 p.m. departures (74%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 24 min |
| Tuesdaybest | 82% | 15 min |
| Wednesday | 81% | 14 min |
| Thursday | 79% | 24 min |
| Friday | 77% | 24 min |
| Saturday | 78% | 15 min |
| Sunday | 77% | 13 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft54%
- Airline operations21%
- National airspace system20%
- Weather5%
Frequently asked questions
- How often are flights from PHL to SDF delayed?
- 21% of PHL–SDF flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 19 minutes.
- Which airline is most reliable from PHL to SDF?
- PSA Airlines has the best on-time record on this route at 81%, based on 426 flights. 2 airlines flew PHL–SDF frequently enough to compare in this period.
- What is the best time of day to fly from PHL to SDF?
- Departures around 8 p.m. have the best record (89% on-time), while departures around 6 p.m. have the worst (74%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PHL to SDF?
- The scheduled PHL–SDF flight time averages 2h 14m over 577 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are PHL to SDF flights cancelled?
- 2.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What is the worst month to fly from PHL to SDF?
- June 2025 was the roughest month in this dataset, with only 55% of arrivals on time. The best was May 2026 at 89%. If your dates are flexible, that 34-point gap is worth planning around.
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Based on 985 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.