OnTimeStats

Historical on-time performance

STLSFO

St. Louis to San Francisco

1,736 miData through Dec 2025Source: US DOT · BTS

Flights on STL–SFO arrive on time 71% of the time over the last 12 months.

On-time rate71%arrived within 15 min
Median delayon timetypical arrival
p90 delay50 min1 in 10 flights is worsetail risk
Cancelled0.7%of scheduled flights

based on 554 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time67%
    Median5 min
    p9045 min
    Cancel0.4%
    Flights245
  • United Airlinesbest
    On-time73%
    Medianon time
    p9060 min
    Cancel1.0%
    Flights309

Why flights run late

Delay causes

  • Airline37%
  • Weather2%
  • Air traffic (NAS)21%
  • Late aircraft39%
  • 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→STL airportSt. Louis→SFO airportSan Francisco→American Airlines on this routecarrier detail→American Airlinesairline 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.