OnTimeStats

Historical on-time performance

PDXORD

Portland to Chicago

1,739 miData through Dec 2025Source: US DOT · BTS

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

On-time rate76%arrived within 15 min
Median delayon timetypical arrival
p90 delay30 min1 in 10 flights is worsetail risk
Cancelled0.7%of scheduled flights

based on 2,441 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Alaska Airlines
    On-time71%
    Median5 min
    p9025 min
    Cancel1.0%
    Flights480
  • United Airlinesbest
    On-time81%
    Medianon time
    p9025 min
    Cancel0.4%
    Flights1,354
  • American Airlines
    On-time70%
    Medianon time
    p9055 min
    Cancel1.0%
    Flights607

Why flights run late

Delay causes

  • Airline34%
  • Weather2%
  • Air traffic (NAS)32%
  • Late aircraft32%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

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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.