OnTimeStats

Historical on-time performance

Portland to Spokane

279 miData through Dec 2025Source: US DOT · BTS

Flights on PDX–GEG arrive on time 84% of the time over the last 12 months.

On-time rate84%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights

based on 751 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • SkyWest Airlinesbest
    On-time87%
    Medianon time
    p9015 min
    Cancel0.5%
    Flights429
  • Alaska Airlines
    On-time80%
    Medianon time
    p9025 min
    Cancel0.9%
    Flights322

Why flights run late

Delay causes

  • Airline32%
  • Weather8%
  • Air traffic (NAS)18%
  • Late aircraft38%
  • Security4%

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 PDX → GEG

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 78% to 87% on time.

  • Evenings87% on time · p90 15 min · 132 flights · limited
  • Afternoons86% on time · p90 15 min · 375 flights
  • Overnights85% on time · p90 20 min · 360 flights
  • Middays80% on time · p90 30 min · 582 flights
  • Mornings78% on time · p90 40 min · 147 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 77% to 88% on time.

  • Wednesdays88% on time · p90 20 min · 240 flights
  • Saturdays87% on time · p90 20 min · 188 flights · limited
  • Mondays85% on time · p90 20 min · 235 flights
  • Tuesdays85% on time · p90 25 min · 234 flights
  • Sundays83% on time · p90 25 min · 245 flights
  • Thursdays78% on time · p90 35 min · 222 flights
  • Fridays77% on time · p90 35 min · 232 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.