Louisville (SDF) to Philadelphia (PHL): On-Time Performance
Data through July 2026
When you fly SDF to PHL matters as much as anything else about the booking: the route swung from 100% on-time in January 2026 to just 67% in July 2026. Across the full period the route averages 83% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 71%), which matters most in the rough months.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 2.2%
- Flights/day
- 1.7
- last 12 months
- Duration
- 1h 60m
- scheduled
- Distance
- 577 mi
Best airline from SDF to PHL
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airwaysmost reliable | 88% | 8 min | 1.2% | 604 |
| PSA Airlines | 76% | 33 min | 3.7% | 435 |
Monthly on-time trend
Best time to fly from SDF to PHL
Aim for departures around 6 a.m. (94% on-time); avoid 3 p.m. departures (70%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 13 min |
| Tuesday | 86% | 18 min |
| Wednesday | 86% | 8 min |
| Thursday | 76% | 20 min |
| Friday | 82% | 40 min |
| Saturdaybest | 87% | 14 min |
| Sunday | 83% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft43%
- Airline operations45%
- National airspace system10%
- Weather2%
Frequently asked questions
- How often are flights from SDF to PHL delayed?
- 17% of SDF–PHL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from SDF to PHL?
- Republic Airways has the best on-time record on this route at 88%, based on 604 flights. 2 airlines flew SDF–PHL frequently enough to compare in this period.
- What is the best time of day to fly from SDF to PHL?
- Departures around 6 a.m. have the best record (94% on-time), while departures around 3 p.m. have the worst (70%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SDF to PHL?
- The scheduled SDF–PHL flight time averages 1h 60m over 577 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are SDF to PHL flights cancelled?
- 2.2% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from SDF to PHL?
- July 2026 was the roughest month in this dataset, with only 67% of arrivals on time. The best was January 2026 at 100%. If your dates are flexible, that 33-point gap is worth planning around.
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Based on 1,052 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.