OnTimeStats

Historical on-time performance

Chicago to Bozeman

1,186 miData through Dec 2025Source: US DOT · BTS

Flights on ORD–BZN arrive on time 71% of the time over the last 12 months.

On-time rate71%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights

based on 862 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.

  • American Airlines
    On-time70%
    Medianon time
    p9045 min
    Cancel0.0%
    Flights296
  • United Airlines
    On-time72%
    Medianon time
    p9050 min
    Cancel1.4%
    Flights566

Why flights run late

Delay causes

  • Airline31%
  • Weather1%
  • Air traffic (NAS)17%
  • Late aircraft51%
  • 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 ORD → BZN

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 62% to 82% on time.

  • Mornings82% on time · p90 25 min · 1,447 flights
  • Afternoons76% on time · p90 45 min · 121 flights · limited
  • Middays73% on time · p90 45 min · 641 flights
  • Evenings62% on time · p90 75 min · 281 flights
  • Overnights62% on time · p90 65 min · 241 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 68% to 81% on time.

  • Tuesdays81% on time · p90 35 min · 341 flights
  • Mondays79% on time · p90 40 min · 375 flights
  • Thursdays78% on time · p90 35 min · 396 flights
  • Saturdays77% on time · p90 40 min · 426 flights
  • Wednesdays76% on time · p90 40 min · 372 flights
  • Sundays71% on time · p90 45 min · 402 flights
  • Fridays68% on time · p90 50 min · 419 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.