Washington (IAD) to Johnstown (JST): On-Time Performance
Data through July 2026
Washington (IAD) to Johnstown (JST) is a thinner route than most in this dataset — 330 departures over the past year, roughly 6 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 77% arrived on time.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 36 min
- completed flights
- Cancelled
- 2.8%
- Flights/day
- 0.90
- last 12 months
- Duration
- 1h 1m
- scheduled
- Distance
- 119 mi
Monthly on-time trend
Best time to fly from IAD to JST
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 45 min |
| Tuesday | 77% | 41 min |
| Wednesday | 70% | 50 min |
| Thursday | 78% | 33 min |
| Friday | 77% | 27 min |
| Saturdaybest | 80% | 17 min |
| Sunday | 79% | 36 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft45%
- Airline operations34%
- National airspace system3%
- Weather18%
Frequently asked questions
- How often are flights from IAD to JST delayed?
- 23% of IAD–JST flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 36 minutes.
- How long is the flight from IAD to JST?
- The scheduled IAD–JST flight time averages 1h 1m over 119 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are IAD to JST flights cancelled?
- 2.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from IAD to JST?
- December 2025 was the roughest month in this dataset, with only 52% of arrivals on time. The best was July 2024 at 97%. If your dates are flexible, that 45-point gap is worth planning around.
Explore related pages
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Other ways to fly to Johnstown (JST)
Related guides
Based on 726 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.