Newark (EWR) to Louisville (SDF): On-Time Performance
Data through July 2026
The biggest risk when flying EWR to SDF isn't a late arrival — it's not departing at all. 4.7% of scheduled flights on this route were cancelled, several times the typical US rate. When flights do go, 81% land on time, no worse than the national average of 78%.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 4.7%
- Flights/day
- 2.7
- last 12 months
- Duration
- 2h 27m
- scheduled
- Distance
- 642 mi
Monthly on-time trend
Best time to fly from EWR to SDF
Aim for departures around 10 a.m. (87% on-time); avoid 8 p.m. departures (71%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 82% | 14 min |
| Tuesdaybest | 85% | 11 min |
| Wednesday | 83% | 14 min |
| Thursday | 79% | 17 min |
| Friday | 77% | 17 min |
| Saturday | 84% | 20 min |
| Sunday | 78% | 17 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft46%
- Airline operations25%
- National airspace system23%
- Weather7%
Frequently asked questions
- How often are flights from EWR to SDF delayed?
- 19% of EWR–SDF 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 16 minutes.
- What is the best time of day to fly from EWR to SDF?
- Departures around 10 a.m. have the best record (87% on-time), while departures around 8 p.m. have the worst (71%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from EWR to SDF?
- The scheduled EWR–SDF flight time averages 2h 27m over 642 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are EWR to SDF flights cancelled?
- 4.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07 — several times the typical US rate, so consider earlier departures or backup options.
- What is the worst month to fly from EWR to SDF?
- July 2024 was the roughest month in this dataset, with only 64% of arrivals on time. The best was May 2026 at 92%. If your dates are flexible, that 28-point gap is worth planning around.
Explore related pages
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Based on 1,993 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.