SDF to EWR flight delays
Louisville, KY (SDF) Newark, NJ (EWR) · 642 miles
973 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
86.17%
Arrived on time
Within 15 minutes of schedule
3.8%
Cancelled
Share of scheduled flights
67 min
When late, late by
Average across delayed arrivals
10 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Cancellation, not delay, is the risk worth pricing here: 3.8% of scheduled flights never operated. A late flight still gets you there. A cancelled one leaves you rebooking, and on a route with few daily departures that can mean losing a day.
The season swings this route hard. In May it ran 23.4 points more punctual than in December — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Only Republic Airways flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
Flights from Louisville to Newark keep to schedule more reliably than most. On a route this punctual the day you fly matters more than the airline you pick.
Which airline should you fly on this route?
Over January 2025 – August 2026, Republic Airways arrived on time most often on SDF to EWR. Flights ran closest to schedule in May and worst in December.
Every airline on SDF to EWR
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Republic Airways | 958 | 86.41% | 3.76% | 67 min | C |
| Spirit Airlines | 12 | 80% | 8.33% | 89 min | — |
| United Airlines | 3 | 33.33% | 0% | 87 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
EWR to SDF Newark back to Louisville 81.86% on time DOther routes from Louisville
Common questions
Are flights from Louisville to Newark usually delayed?
86.17% of flights on the SDF to EWR route arrived within 15 minutes of schedule, so roughly 1 in every ten arrived late. That is better than the average route in this record.
Which airlines fly from Louisville to Newark?
Only Republic Airways appears in the published record on this route, with 958 flights and 86.41% arriving on time.
How often are SDF to EWR flights cancelled?
3.8% of scheduled flights did not operate — about 38 in every thousand. That is high enough that cancellation, not delay, is the risk worth planning around.
What is the best month to fly Louisville to Newark?
May, when 96.6% of flights arrived on time. The worst was December at 73.2%.
When SDF to EWR flights are late, how late are they?
About 67 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SDF to EWR during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →