Best time to fly out of Portsmouth at Pease (PSM)
Portsmouth at Pease 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 | – | – | – | – | – | – | – |
| 4–6pm | – | – | – | – | – | – | – |
| 6–8pm | – | – | – | – | – | – | – |
| 8–10pm | – | – | – | – | – | – | – |
| 10pm–12am | – | – | – | – | – | – | – |
Not enough flights to say — fewer than 100 in this window.
The year at PSM
July was the hard month at PSM: 67.3% of departures left on time, across 107 flights. May was the easy one at 82.1%. 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 | Not enough flights to say | 85 |
| February | 79.3% | 117 |
| March | 75% | 120 |
| April | 80.4% | 185 |
| May | 82.1% | 119 |
| June | Not enough flights to say | 97 |
| July | 67.3% | 107 |
| August | Not enough flights to say | 88 |
| September | Not enough flights to say | 60 |
| October | Not enough flights to say | 88 |
| November | Not enough flights to say | 84 |
| December | Not enough flights to say | 101 |
Airlines at PSM
Every airline with at least 100 departures from PSM, 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 |
|---|---|---|---|---|
| Allegiant Air | 77.9% | 105 min | 1% | 1,251 |
What delays out of PSM were put down to
Airlines file a reason with every arrival running 15 minutes late or more. Across 295 flights that departed PSM and ran 15 minutes late or more, the delay minutes break down with 32.3% put down to airline operations and 31.3% to late-arriving aircraft.
- Late-arriving aircraft 31.3%
- Airline operations 32.3%
- Air traffic & airport volume 26.5%
- Severe weather 9.9%
- 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 PSM
Of 1,250 scheduled arrivals into PSM, 83.4% reached the gate less than 15 minutes behind schedule. Of the 190 arrivals that ran late, 57.4% 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 PSM
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.
PSM in one number
Portsmouth at Pease (PSM)
Rank 316 of 363 US airports by departures. Steadiest stretch of the day: —. Hardest month: July.
Questions about PSM
- What is the worst month to fly out of PSM?
- July: 67.3% of the departures that flew left on time, with 107 scheduled. May was the other end of the year at 82.1%. Each figure pools three years of that calendar month.
- How often are flights cancelled at PSM?
- 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.