OnTimeStats

Historical on-time performance

Seattle to Kona

2,688 miData through Dec 2025Source: US DOT · BTS

Flights on SEA–KOA arrive on time 74% of the time over the last 12 months.

On-time rate74%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights

based on 1,412 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Delta Air Linesbest
    On-time82%
    Medianon time
    p9025 min
    Cancel1.2%
    Flights337
  • Alaska Airlines
    On-time71%
    Medianon time
    p9040 min
    Cancel1.2%
    Flights1,075

Why flights run late

Delay causes

  • Airline46%
  • Weather2%
  • Air traffic (NAS)23%
  • Late aircraft29%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly SEA → KOA

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 73% to 81% on time.

  • Mornings81% on time · p90 25 min · 934 flights
  • Afternoons80% on time · p90 35 min · 723 flights
  • Evenings75% on time · p90 35 min · 1,005 flights
  • Middays73% on time · p90 40 min · 1,583 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 75% to 79% on time.

  • Wednesdays79% on time · p90 30 min · 598 flights
  • Fridays77% on time · p90 40 min · 612 flights
  • Saturdays77% on time · p90 35 min · 619 flights
  • Sundays77% on time · p90 35 min · 613 flights
  • Tuesdays76% on time · p90 35 min · 601 flights
  • Thursdays75% on time · p90 30 min · 611 flights
  • Mondays75% on time · p90 35 min · 591 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.