OnTimeStats

Historical on-time performance

San Francisco to Spokane

733 miData through Dec 2025Source: US DOT · BTS

Flights on SFO–GEG arrive on time 80% of the time over the last 12 months.

On-time rate80%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights

based on 890 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • SkyWest Airlines
    On-time80%
    Medianon time
    p9035 min
    Cancel0.2%
    Flights890

Why flights run late

Delay causes

  • Airline30%
  • Weather2%
  • Air traffic (NAS)35%
  • Late aircraft34%
  • Security0%

Most delay minutes here are attributed to Air traffic (NAS).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly SFO → 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 75% to 88% on time.

  • Mornings88% on time · p90 20 min · 138 flights · limited
  • Evenings85% on time · p90 25 min · 334 flights
  • Afternoons81% on time · p90 25 min · 386 flights
  • Middays81% on time · p90 35 min · 769 flights
  • Overnights75% on time · p90 50 min · 446 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 74% to 85% on time.

  • Tuesdays85% on time · p90 30 min · 298 flights
  • Saturdays83% on time · p90 30 min · 278 flights
  • Wednesdays83% on time · p90 20 min · 306 flights
  • Mondays82% on time · p90 45 min · 303 flights
  • Sundays80% on time · p90 30 min · 304 flights
  • Thursdays80% on time · p90 35 min · 293 flights
  • Fridays74% on time · p90 45 min · 291 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.