Historical on-time performance
Johnstown to Washington
119 miData through May 2026Source: US DOT · BTS
Flights on JST–IAD arrive on time 71% of the time over the last 12 months.
On-time rate71%arrived within 15 min
p90 delay220 min1 in 10 flights is worse (tail risk)
Cancelled3.6%of scheduled flights
based on 275 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesOn-time71%Medianon timep90220 minCancel3.6%Flights275
Why flights run late
Delay causes
- Airline44%
- Weather9%
- Air traffic (NAS)6%
- Late aircraft41%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline10%
- Weather90%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 10 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly JST → IAD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Middays are the most reliable time of day to fly this route — 81% on time.
- Middays81% on time · p90 55 min · 561 flights
- Mornings74% on time · p90 220 min · 517 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 81% on time.
- Saturdays81% on time · p90 80 min · 148 flights · limited
- Thursdays81% on time · p90 65 min · 156 flights · limited
- Tuesdays80% on time · p90 115 min · 148 flights · limited
- Wednesdays77% on time · p90 115 min · 156 flights · limited
- Fridays76% on time · p90 105 min · 157 flights · limited
- Sundays76% on time · p90 85 min · 157 flights · limited
- Mondays72% on time · p90 95 min · 156 flights · limited
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