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Route · EWR → SDF · 2020–2025 BTS data

Newark to Louisville

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), EWR to SDF (Newark to Louisville) ranks #2829 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

82.8%
On-time
+3.8 pts
vs US avg
78 min
Delay when late
4,184
Flights
#2829 of 4927
Corpus placement

Cancelled

3.7%

Best Month

Feb 2024 97%

Worst Month

Jul 2024 68%

Distance

642 mi

Carriers

11

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 74 17 4 0 YX
Nov 2025 86 20 7 1 YX
Oct 2025 93 23 2 0 YX
Sep 2025 63 7 2 0 YX
Aug 2025 65 11 1 0 YX,NK
Jul 2025 73 15 6 0 YX,NK
Jun 2025 71 15 4 0 NK,YX
May 2025 66 19 6 0 UA,YX,NK
Apr 2025 56 9 3 0 YX
Mar 2025 87 9 1 1 YX
Feb 2025 83 11 1 0 YX
Jan 2025 86 10 5 0 YX
Dec 2024 78 12 1 0 YX
Nov 2024 83 21 1 0 YX
Oct 2024 93 15 0 0 YX
Sep 2024 78 9 0 0 YX
Aug 2024 82 16 9 0 YX
Jul 2024 65 21 6 0 UA,YX
Jun 2024 90 18 6 0 YX
May 2024 96 17 1 1 YX,NK,UA
Apr 2024 90 13 1 0 YX
Mar 2024 90 5 0 1 YX
Feb 2024 87 3 2 0 YX
Jan 2024 85 10 2 0 YX

EWR–SDF seasonal on-time pattern

Best: September (90.8%) · weakest: July (72.0%)

70%75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 83%

Strongest calendar month

September

90.8% on-time · ~71 flights/mo

Busiest calendar month

May

~90 flights/mo avg

Weakest calendar month

July

72.0% on-time · ~79 flights/mo

Cancellation Rate

3.7%

71 of 1,920 flights

Diversion Rate

0.2%

4 of 1,920 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

EWR - Newark

Full on-time, delay-cause, and seasonal performance for Newark, NJ.

EWR on-time profile

SDF - Louisville

Full on-time, delay-cause, and seasonal performance for Louisville, KY.

SDF on-time profile

Compare the two airports

See EWR and SDF side by side on delays, cancellations, and reliability.

Compare EWR vs SDF

Origin-hub reliability standing

Mid-pack among EWR departures

From EWR, this corridor sits with 60 other 75–85% on-time routes out of 74 tracked departures, not the hub's reliability leaders (5 at ≥85%) and not the softest ( 9 below 75%). Destination: Louisville · fleet on-time rank #2029 of 4927.

What the Data Says About EWR to SDF

Bureau of Transportation Statistics records show Newark to Louisville (EWR to SDF) running a 82.8% on-time rate over 4,184 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 78.2 minutes. The 642-mile corridor is served by 11 carriers, and over the last 24 months 3.7% of 1,920 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Feb 2024 posted the strongest performance at 97% on-time, while Jul 2024 came in at just 68% - a 29-point swing worth factoring into travel timing.

On the multi-year calendar, EWR–SDF peaks in September at 90.8% on-time while May carries the heaviest traffic (~90 flights per month) ; the softest month is July at 72.0%, a 18.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does EWR to SDF rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, EWR to SDF ranks #2829 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from EWR to SDF? ▼
Flights from Newark to Louisville have a 82.8% on-time rate based on 4,184 flights. The average delay is 78.2 minutes. The best recent month was Feb 2024 with 97% on-time.
What is the cancellation rate for EWR to SDF? ▼
Over the last 24 months, 3.7% of flights on this route were cancelled (71 of 1,920 flights) and 0.2% were diverted.
How far is the flight from EWR to SDF? ▼
The flight distance from Newark (EWR) to Louisville (SDF) is approximately 642 miles. This route is served by 11 carriers.
When is the best time to fly from EWR to SDF? ▼
The best recent month for on-time performance was Feb 2024 (97% on-time). The worst was Jul 2024 (68% on-time). Consider booking during months with historically better performance.

Airports on this route

EWR Airport

Newark
SDF Airport

Louisville
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using EWR–SDF data

EWR–SDF runs 3.8 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare EWR and SDF airport profiles: delay causes and top routes differ even on the same corridor. EWR airport
  • If your dates flex, September (90.8% on-time) beats July (72.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 82.8% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.