Best Time to Fly IAD to JST: On-Time Stats by Hour & Airline
Washington Dulles International → John Murtha Johnstown-Cambria County
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.1% of Washington (IAD) to Johnstown (JST) flights arrived on time (330 scheduled flights). That is 1.5 points below the national average of 77.6%.
SkyWest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Sunday was the most reliable day (81% on time) and December the worst month (65%).
The cancellation rate was 3.6% (US average 1.8%).
IAD to JST on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlines | 76.1% | 177 min | 3.6% | 330 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to JST
On-time arrival % by scheduled departure hour (local time), 695 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12pm–1pm | 75.8% | 3.1% | 642 |
| 1pm–2pm | 90.2% | 0.0% | 53 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAD to JST
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 14 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 29 | ||
| Summer peak (Jun 15 - Aug 15) | 74.5% | -3.9 pts | 0.0% | 111 |
| All other days | 78.5% | — | 3.1% | 541 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).