OnTimeStats

Historical on-time performance

Grand Rapids to Sanford

1,001 miData through Dec 2025Source: US DOT · BTS

Flights on GRR–SFB arrive on time 68% of the time over the last 12 months.

On-time rate68%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights

based on 350 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Allegiant Air
    On-time68%
    Medianon time
    p9065 min
    Cancel0.0%
    Flights350

Why flights run late

Delay causes

  • Airline22%
  • Weather14%
  • Air traffic (NAS)21%
  • Late aircraft43%
  • Security0%

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 GRR → SFB

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 36% to 85% on time.

  • Middays85% on time · p90 25 min · 143 flights · limited
  • Mornings82% on time · p90 35 min · 468 flights
  • Afternoons69% on time · p90 65 min · 329 flights
  • Evenings67% on time · p90 65 min · 139 flights · limited
  • Overnights36% on time · p90 140 min · 56 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 71% to 81% on time.

  • Tuesdays81% on time · p90 40 min · 103 flights · limited
  • Fridays77% on time · p90 55 min · 176 flights · limited
  • Saturdays76% on time · p90 55 min · 194 flights · limited
  • Sundays74% on time · p90 55 min · 195 flights · limited
  • Thursdays73% on time · p90 70 min · 192 flights · limited
  • Wednesdays72% on time · p90 50 min · 102 flights · limited
  • Mondays71% on time · p90 65 min · 173 flights · limited
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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.