Johnstown (JST) to Washington (IAD): On-Time Performance
Data through July 2026
Johnstown (JST) to Washington (IAD) 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, 78% arrived on time.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 39 min
- completed flights
- Cancelled
- 2.6%
- Flights/day
- 0.90
- last 12 months
- Duration
- 1h 3m
- scheduled
- Distance
- 119 mi
Monthly on-time trend
Best time to fly from JST to IAD
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 38 min |
| Tuesday | 76% | 47 min |
| Wednesday | 76% | 37 min |
| Thursdaybest | 87% | 24 min |
| Friday | 73% | 52 min |
| Saturday | 81% | 44 min |
| Sunday | 81% | 34 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations44%
- National airspace system6%
- Weather11%
Frequently asked questions
- How often are flights from JST to IAD delayed?
- 22% of JST–IAD 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 39 minutes.
- How long is the flight from JST to IAD?
- The scheduled JST–IAD flight time averages 1h 3m over 119 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are JST to IAD flights cancelled?
- 2.6% 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 JST to IAD?
- December 2025 was the roughest month in this dataset, with only 44% of arrivals on time. The best was May 2026 at 96%. If your dates are flexible, that 51-point gap is worth planning around.
Explore related pages
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Related guides
Based on 726 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.