OnTimeStats

Historical on-time performance

Newark to Louisville

642 miData through Dec 2025Source: US DOT · BTS

Flights on EWR–SDF arrive on time 78% of the time over the last 12 months.

On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled4.6%of scheduled flights

based on 868 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Republic Airways
    On-time78%
    Medianon time
    p9040 min
    Cancel4.6%
    Flights868

Why flights run late

Delay causes

  • Airline24%
  • Weather1%
  • Air traffic (NAS)25%
  • Late aircraft50%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly EWR → SDF

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 68% to 88% on time.

  • Mornings88% on time · p90 15 min · 469 flights
  • Middays87% on time · p90 20 min · 673 flights
  • Afternoons81% on time · p90 30 min · 478 flights
  • Evenings80% on time · p90 40 min · 712 flights
  • Overnights68% on time · p90 80 min · 644 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 76% to 84% on time.

  • Wednesdays84% on time · p90 25 min · 434 flights
  • Saturdays84% on time · p90 30 min · 360 flights
  • Tuesdays83% on time · p90 30 min · 432 flights
  • Mondays81% on time · p90 40 min · 440 flights
  • Thursdays78% on time · p90 40 min · 432 flights
  • Sundays77% on time · p90 45 min · 441 flights
  • Fridays76% on time · p90 40 min · 437 flights
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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.