OnTimeStats

Historical on-time performance

Baltimore to Louisville

495 miData through Dec 2025Source: US DOT · BTS

Flights on BWI–SDF arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled2.4%of scheduled flights

based on 888 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time77%
    Medianon time
    p9035 min
    Cancel2.4%
    Flights888

Why flights run late

Delay causes

  • Airline35%
  • Weather8%
  • Air traffic (NAS)12%
  • Late aircraft45%
  • 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 BWI → 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 63% to 85% on time.

  • Mornings85% on time · p90 20 min · 450 flights
  • Middays85% on time · p90 20 min · 715 flights
  • Evenings75% on time · p90 35 min · 389 flights
  • Afternoons74% on time · p90 40 min · 367 flights
  • Overnights63% on time · p90 65 min · 722 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 67% to 86% on time.

  • Tuesdays86% on time · p90 20 min · 336 flights
  • Wednesdays81% on time · p90 30 min · 338 flights
  • Mondays78% on time · p90 30 min · 394 flights
  • Thursdays76% on time · p90 35 min · 395 flights
  • Fridays75% on time · p90 35 min · 398 flights
  • Saturdays72% on time · p90 45 min · 338 flights
  • Sundays67% on time · p90 50 min · 444 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.