EWR to SDF flight delays & on-time performance
Nonstop flights from Newark Liberty International Airport to Louisville Muhammad Ali International Airport · 642 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at EWR or SDF right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Newark (EWR) to Louisville (SDF) arrived on time 81% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 5.1% were cancelled, and 7% arrived an hour or more late.
- Departures scheduled around 4pm did best (89% on time); around 8pm did worst (74%).
- Thursday was the most reliable day to fly (85% on time) and Sunday the least (74%).
- The largest source of delay minutes was late-arriving aircraft (50%).
Which airline is most on time from EWR to SDF?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Spirit Airlines | 100% | 0.0% | 3 min | 0.0% | 4 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 81% | 5.2% | 15 min | 7.1% | 985 |
| United Airlines | 67% | 0.0% | 21 min | 33.3% | 3 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 9am82%69 flights
- 10am87%232 flights
- 11am89%18 flights
- 12pm53%17 flights
- 4pm89%87 flights
- 5pm78%108 flights
- 6pm82%96 flights
- 7pm95%21 flights
- 8pm74%254 flights
- 9pm81%88 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday82%7.6% cancelled
- Tuesday82%5.5% cancelled
- Wednesday82%2.8% cancelled
- Thursday85%4.1% cancelled
- Friday82%1.4% cancelled
- Saturday81%4.1% cancelled
- Sunday74%10.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft50%
- Airline (crew, maintenance, cleaning, fueling)20%
- Air traffic control & airport congestion19%
- Extreme weather11%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather67%
- Air traffic control & airport congestion33%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
EWR to SDF: common questions
- How often are EWR to SDF flights on time?
- 81% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Newark to Louisville cancelled?
- 5.1% of scheduled flights were cancelled (51 of 992).
- How long are typical delays?
- Across all flights the average arrival delay was 15 min (early arrivals count as zero). Flights that were late arrived 76 min behind schedule on average, and 7.1% of flights were an hour or more late.
- How long is taxi time at EWR?
- Flights on this route spent 26 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SDF to EWR — 87% on time
More flights from Newark
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: EWR → SDF, nonstop flights by US airlines that report to the DOT. How we calculate this.