OnTimeStats

Historical on-time performance

Spokane to Portland

279 miData through May 2026Source: US DOT · BTS

Flights on GEG–PDX arrive on time 87% of the time over the last 12 months.

On-time rate87%arrived within 15 min
p90 delay15 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights

based on 819 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Too close to call — no single carrier is clearly more on-time here.

  • Alaska Airlines
    On-time89%
    Medianon time
    p9010 min
    Cancel1.5%
    Flights456
  • SkyWest Airlines
    On-time85%
    Medianon time
    p9020 min
    Cancel0.6%
    Flights363

Why flights run late

Delay causes

  • Airline28%
  • Weather4%
  • Air traffic (NAS)19%
  • Late aircraft50%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline78%
  • Weather11%
  • Air traffic (NAS)11%
  • Security0%

Most cancellations here are attributed to Airline. Shares are among 9 cancellations with a reported cause (BTS reports causes from June 2003).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly GEG → PDX

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

Mornings are the most reliable time of day to fly this route — 92% on time.

  • Mornings92% on time · p90 5 min · 452 flights
  • Afternoons85% on time · p90 25 min · 651 flights
  • Evenings84% on time · p90 30 min · 197 flights · limited
  • Middays82% on time · p90 20 min · 474 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 81% to 90% on time.

  • Wednesdays90% on time · p90 10 min · 251 flights
  • Saturdays88% on time · p90 20 min · 228 flights
  • Tuesdays88% on time · p90 15 min · 250 flights
  • Mondays87% on time · p90 20 min · 266 flights
  • Sundays85% on time · p90 20 min · 261 flights
  • Fridays83% on time · p90 20 min · 264 flights
  • Thursdays81% on time · p90 25 min · 254 flights

Keep exploring

Related pages

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.