OnTimeStats

Historical on-time performance

Johnstown to Washington

120 miData through Dec 2025Source: US DOT · BTS

Flights on JST–IAD arrive on time 79% of the time over the last 12 months.

On-time rate79%arrived within 15 min
Median delayon timetypical arrival
p90 delay130 min1 in 10 flights is worsetail risk
Cancelled1.8%of scheduled flights

based on 337 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • SkyWest Airlinesbest
    On-time79%
    Medianon time
    p90130 min
    Cancel1.8%
    Flights337

Why flights run late

Delay causes

  • Airline47%
  • Weather1%
  • Air traffic (NAS)7%
  • Late aircraft45%
  • 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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Keep exploring

Related pages

Delay predictorfor this route→JST airportJohnstown→IAD airportWashington→SkyWest Airlines on this routecarrier detail→SkyWest 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.