Historical on-time performance
Washington to Johnstown
120 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–JST arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay80 min1 in 10 flights is worse (tail 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 AirlinesOn-time74%Medianon timep9080 minCancel1.8%Flights337
Why flights run late
Delay causes
- Airline28%
- Weather23%
- Air traffic (NAS)4%
- Late aircraft44%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → JST
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 82% on time.
- Mondays82% on time · p90 45 min · 157 flights · limited
- Tuesdays81% on time · p90 75 min · 157 flights · limited
- Fridays81% on time · p90 55 min · 156 flights · limited
- Thursdays81% on time · p90 60 min · 156 flights · limited
- Wednesdays77% on time · p90 35 min · 157 flights · limited
- Sundays76% on time · p90 45 min · 156 flights · limited
- Saturdays76% on time · p90 75 min · 156 flights · limited
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