OnTimeStats

Historical on-time performance

Baltimore to Louisville

495 miData through May 2026Source: 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)
Cancelled2.6%of scheduled flights

based on 890 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
    Cancel2.6%
    Flights890

Why flights run late

Delay causes

  • Airline39%
  • Weather5%
  • Air traffic (NAS)10%
  • Late aircraft46%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline9%
  • Weather65%
  • Air traffic (NAS)26%
  • Security0%

Most cancellations here are attributed to Weather. Shares are among 23 cancellations with a reported cause (BTS reports causes from June 2003).

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 (2023-06 .. 2026-05).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 66% to 86% on time.

  • Middays86% on time · p90 20 min · 795 flights
  • Mornings85% on time · p90 20 min · 369 flights
  • Evenings73% on time · p90 45 min · 309 flights
  • Afternoons73% on time · p90 40 min · 380 flights
  • Overnights66% on time · p90 65 min · 818 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 68% to 85% on time.

  • Tuesdays85% on time · p90 20 min · 334 flights
  • Wednesdays80% on time · p90 30 min · 336 flights
  • Mondays77% on time · p90 35 min · 400 flights
  • Thursdays76% on time · p90 35 min · 406 flights
  • Fridays74% on time · p90 40 min · 408 flights
  • Saturdays74% on time · p90 45 min · 347 flights
  • Sundays68% on time · p90 50 min · 440 flights

Keep exploring

Related pages

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.