OnTimeStats

Historical on-time performance

ORDSAN

Chicago to San Diego

1,723 miData through Dec 2025Source: US DOT · BTS

Flights on ORD–SAN arrive on time 73% of the time over the last 12 months.

On-time rate73%arrived within 15 min
Median delayon timetypical arrival
p90 delay55 min1 in 10 flights is worsetail risk
Cancelled0.9%of scheduled flights

based on 3,298 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time79%
    Medianon time
    p9040 min
    Cancel0.1%
    Flights1,697
  • American Airlines
    On-time70%
    Medianon time
    p9060 min
    Cancel1.1%
    Flights1,315
  • Alaska Airlines
    On-time56%
    Median5 min
    p9080 min
    Cancel4.7%
    Flights255
  • Frontier Airlines
    On-time39%
    Median30 min
    p90115 min
    Cancel0.0%
    Flights31

Why flights run late

Delay causes

  • Airline32%
  • Weather5%
  • Air traffic (NAS)22%
  • 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.