OnTimeStats

Historical on-time performance

Atlanta to Boise

1,838 miData through Dec 2025Source: US DOT · BTS

Flights on ATL–BOI arrive on time 78% of the time over the last 12 months.

On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights

based on 485 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Delta Air Lines
    On-time78%
    Medianon time
    p9040 min
    Cancel1.2%
    Flights485

Why flights run late

Delay causes

  • Airline49%
  • Weather3%
  • Air traffic (NAS)20%
  • Late aircraft28%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly ATL → BOI

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 67% to 87% on time.

  • Mornings87% on time · p90 15 min · 349 flights
  • Middays86% on time · p90 20 min · 747 flights
  • Evenings71% on time · p90 50 min · 93 flights · limited
  • Overnights67% on time · p90 55 min · 245 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 74% to 86% on time.

  • Tuesdays86% on time · p90 15 min · 170 flights · limited
  • Wednesdays85% on time · p90 25 min · 178 flights · limited
  • Saturdays85% on time · p90 20 min · 169 flights · limited
  • Thursdays84% on time · p90 20 min · 236 flights
  • Mondays83% on time · p90 25 min · 204 flights
  • Fridays81% on time · p90 25 min · 237 flights
  • Sundays74% on time · p90 35 min · 240 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.