OnTimeStats

Historical on-time performance

IAHORD

Houston to Chicago

925 miData through Dec 2025Source: US DOT · BTS

Flights on IAH–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 delay50 min1 in 10 flights is worsetail risk
Cancelled1.3%of scheduled flights

based on 5,346 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Republic Airways
    On-time70%
    Medianon time
    p9060 min
    Cancel3.4%
    Flights264
  • United Airlines
    On-time79%
    Medianon time
    p9040 min
    Cancel0.9%
    Flights3,822
  • Spirit Airlines
    On-time70%
    Medianon time
    p9060 min
    Cancel2.4%
    Flights412
  • Envoy Airbest
    On-time80%
    Medianon time
    p9050 min
    Cancel0.0%
    Flights46
  • American Airlines
    On-time68%
    Medianon time
    p9085 min
    Cancel2.0%
    Flights802

Why flights run late

Delay causes

  • Airline27%
  • Weather8%
  • Air traffic (NAS)28%
  • Late aircraft37%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

Advertisement

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.