OnTimeStats

Historical on-time performance

Newark to Seattle

2,402 miData through Dec 2025Source: US DOT · BTS

Flights on EWR–SEA arrive on time 69% of the time over the last 12 months.

On-time rate69%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled1.7%of scheduled flights

based on 2,006 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Alaska Airlines
    On-time63%
    Medianon time
    p9080 min
    Cancel3.0%
    Flights1,095
  • United Airlinesbest
    On-time77%
    Medianon time
    p9050 min
    Cancel0.2%
    Flights911

Why flights run late

Delay causes

  • Airline16%
  • Weather6%
  • Air traffic (NAS)30%
  • Late aircraft47%
  • Security1%

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 EWR → SEA

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 45% to 82% on time.

  • Middays82% on time · p90 30 min · 276 flights
  • Mornings82% on time · p90 30 min · 2,050 flights
  • Afternoons76% on time · p90 55 min · 1,439 flights
  • Evenings62% on time · p90 80 min · 2,271 flights
  • Overnights45% on time · p90 110 min · 91 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 69% to 78% on time.

  • Tuesdays78% on time · p90 40 min · 875 flights
  • Wednesdays75% on time · p90 50 min · 874 flights
  • Mondays73% on time · p90 60 min · 896 flights
  • Sundays73% on time · p90 55 min · 896 flights
  • Fridays70% on time · p90 65 min · 894 flights
  • Thursdays70% on time · p90 55 min · 881 flights
  • Saturdays69% on time · p90 70 min · 811 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.