OnTimeStats

Historical on-time performance

BZNORD

Bozeman to Chicago

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

Flights on BZN–ORD arrive on time 75% of the time over the last 12 months.

On-time rate75%arrived within 15 min
Median delayon timetypical arrival
p90 delay55 min1 in 10 flights is worsetail risk
Cancelled0.9%of scheduled flights

based on 863 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time82%
    Medianon time
    p9030 min
    Cancel1.4%
    Flights567
  • American Airlines
    On-time61%
    Medianon time
    p9090 min
    Cancel0.0%
    Flights296

Why flights run late

Delay causes

  • Airline24%
  • Weather5%
  • Air traffic (NAS)30%
  • Late aircraft41%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

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Keep exploring

Related pages

Delay predictorfor this route→BZN airportBozeman→ORD airportChicago→Republic Airways on this routecarrier detail→Republic Airwaysairline profile→

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.