OnTimeStats

Historical on-time performance

Knoxville to Washington

437 miData through Dec 2025Source: US DOT · BTS

Flights on TYS–DCA arrive on time 63% of the time over the last 12 months.

On-time rate63%arrived within 15 min
p90 delay85 min1 in 10 flights is worse (tail risk)
Cancelled5.7%of scheduled flights

based on 908 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • PSA Airlines
    On-time63%
    Medianon time
    p9085 min
    Cancel5.7%
    Flights908

Why flights run late

Delay causes

  • Airline35%
  • Weather7%
  • Air traffic (NAS)14%
  • Late aircraft43%
  • 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 TYS → DCA

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 65% to 82% on time.

  • Mornings82% on time · p90 30 min · 1,028 flights
  • Afternoons82% on time · p90 50 min · 184 flights · limited
  • Middays81% on time · p90 35 min · 1,056 flights
  • Evenings65% on time · p90 75 min · 948 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 74% to 80% on time.

  • Saturdays80% on time · p90 35 min · 347 flights
  • Tuesdays77% on time · p90 50 min · 488 flights
  • Sundays77% on time · p90 45 min · 439 flights
  • Wednesdays77% on time · p90 45 min · 492 flights
  • Thursdays77% on time · p90 50 min · 477 flights
  • Fridays75% on time · p90 50 min · 483 flights
  • Mondays74% on time · p90 55 min · 490 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.