OnTimeStats

Historical on-time performance

Washington to Nashville

542 miData through Dec 2025Source: US DOT · BTS

Flights on IAD–BNA arrive on time 78% of the time over the last 12 months.

On-time rate78%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights

based on 934 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlines
    On-time78%
    Medianon time
    p9045 min
    Cancel0.3%
    Flights934

Why flights run late

Delay causes

  • Airline25%
  • Weather5%
  • Air traffic (NAS)34%
  • Late aircraft36%
  • 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 IAD → BNA

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

Best time of day

Mornings are the most reliable time of day to fly this route — 91% on time.

  • Mornings91% on time · p90 10 min · 1,040 flights
  • Middays85% on time · p90 25 min · 746 flights
  • Evenings71% on time · p90 60 min · 1,065 flights
  • Afternoons66% on time · p90 60 min · 133 flights · limited
  • Overnights55% on time · p90 120 min · 76 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 76% to 83% on time.

  • Wednesdays83% on time · p90 30 min · 396 flights
  • Mondays83% on time · p90 25 min · 417 flights
  • Saturdays82% on time · p90 35 min · 426 flights
  • Fridays82% on time · p90 35 min · 409 flights
  • Tuesdays80% on time · p90 40 min · 429 flights
  • Thursdays77% on time · p90 45 min · 499 flights
  • Sundays76% on time · p90 55 min · 484 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.