Best time to fly out of Johnstown (JST)
John Murtha Johnstown Cambria did not fly enough departures in this window to split the day into time bands. Not enough flights to say. A percentage needs at least 100 flights behind it before it is worth printing; anything thinner is noise wearing a decimal point. These are historical odds, not forecasts. The records say what happened on this schedule over three years; they know nothing about tomorrow’s thunderstorm.
Data through June 2026 · Bureau of Transportation Statistics
On-time rate by hour and day
On this page, “on time” means a departure that pushed back less than 15 minutes behind its scheduled time — the Bureau of Transportation Statistics definition, and the one airlines are held to.
| Departure time | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| Before 6am | – | – | – | – | – | – | – |
| 6–8am | – | – | – | – | – | – | – |
| 8–10am | – | – | – | – | – | – | – |
| 10am–12pm | – | – | – | – | – | – | – |
| 12–2pm | – | – | – | – | – | – | – |
| 2–4pm | 76 | 83 | 76 | 79 | 78 | 80 | 77 |
| 4–6pm | – | – | – | – | – | – | – |
| 6–8pm | – | – | – | – | – | – | – |
| 8–10pm | – | – | – | – | – | – | – |
| 10pm–12am | – | – | – | – | – | – | – |
Not enough flights to say — fewer than 100 in this window.
The year at JST
December was the hard month at JST: 73.4% of departures left on time, across 182 flights. September was the easy one at 87.2%. Each month pools three years of that month, so a single bad week does not decide it.
| Month | Share departures that left on time | Flights |
|---|---|---|
| January | 74.3% | 185 |
| February | 73.9% | 170 |
| March | 80.1% | 186 |
| April | 76.2% | 172 |
| May | 84.7% | 177 |
| June | 78.1% | 171 |
| July | 77.6% | 186 |
| August | 86.5% | 186 |
| September | 87.2% | 180 |
| October | 84.8% | 186 |
| November | 77.5% | 177 |
| December | 73.4% | 182 |
Airlines at JST
Every airline with at least 100 departures from JST, busiest first. These are that airline’s departures from this airport only — its record across the country sits on its own page.
| Airline | Left on time | Typical delay | Cancelled | Departures |
|---|---|---|---|---|
| SkyWest Airlines | 79.7% | 168 min | 3.1% | 2,158 |
What delays out of JST were put down to
Airlines file a reason with every arrival running 15 minutes late or more. Across 465 flights that departed JST and ran 15 minutes late or more, the delay minutes break down with 51.7% put down to late-arriving aircraft and 28.9% to airline operations.
- Late-arriving aircraft 51.7%
- Airline operations 28.9%
- Air traffic & airport volume 10.2%
- Severe weather 9.2%
- Security 0%
Late-arriving aircraft is the knock-on category: the plane came in late, so it went out late again. It is why a 7am problem in Newark is still a problem in Denver at dinnertime, and why it is usually the biggest slice on the bar.
If you are connecting through JST
Of 2,158 scheduled arrivals into JST, 69.9% reached the gate less than 15 minutes behind schedule. Of the 552 arrivals that ran late, 42.6% were no more than 45 minutes behind — which is the difference between a tight connection and a new boarding pass.
Work out a specific layover — pick the airport and the minutes you have, and the tool reads the same arrival records back as a share.
Busiest routes out of JST
Ranked by flights, with the share that arrived on time at the far end. Where a route carries enough flights for a page of its own the chip goes there; otherwise it goes to the destination airport.
JST in one number
John Murtha Johnstown Cambria (JST)
Rank 272 of 363 US airports by departures. Steadiest stretch of the day: 2–4pm. Hardest month: December.
Questions about JST
- What is the worst month to fly out of JST?
- December: 73.4% of the departures that flew left on time, with 182 scheduled. September was the other end of the year at 87.2%. Each figure pools three years of that calendar month.
- How often are flights cancelled at JST?
- 3.1% of scheduled departures were cancelled over July 2023 through June 2026. Cancellations are counted against everything scheduled, not against everything that flew — a rate that looks small still adds up to real people in a rebooking line.