OnTimeStats

Historical on-time performance

ORDLAX

Chicago to Los Angeles

1,744 miData through Dec 2025Source: US DOT · BTS

Flights on ORD–LAX arrive on time 76% of the time over the last 12 months.

On-time rate76%arrived within 15 min
Median delayon timetypical arrival
p90 delay45 min1 in 10 flights is worsetail risk
Cancelled1.1%of scheduled flights

based on 6,912 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Spirit Airlines
    On-time77%
    Medianon time
    p9045 min
    Cancel1.3%
    Flights559
  • United Airlinesbest
    On-time81%
    Medianon time
    p9035 min
    Cancel0.5%
    Flights3,342
  • American Airlines
    On-time71%
    Medianon time
    p9060 min
    Cancel1.7%
    Flights3,011

Why flights run late

Delay causes

  • Airline36%
  • Weather7%
  • Air traffic (NAS)16%
  • 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

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.