Portsmouth International at Pease (PSM) Delays and On-Time Departures
Portsmouth, NH · ranked 264th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, Portsmouth (PSM) had 430 scheduled departures and 76.6% of them left on time (US average 77.4%).
That ranks 264th of 333 US airports tracked on this site, with 0.7% of departures cancelled.
Over 24 months, Friday was the most reliable day (86% on time) and June the worst month (67%).
Best time of day to fly out of Portsmouth (PSM)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 3am–4am | Limited data | 1 | |
| 9am–10am | 78.7% | 0.0% | 47 |
| 10am–11am | 79.3% | 0.0% | 145 |
| 11am–12pm | 88.1% | 1.2% | 170 |
| 12pm–1pm | 84.7% | 1.0% | 99 |
| 1pm–2pm | 87.7% | 1.7% | 58 |
| 2pm–3pm | Limited data | 24 | |
| 3pm–4pm | Limited data | 10 | |
| 4pm–5pm | Limited data | 10 | |
| 5pm–6pm | 67.4% | 0.0% | 43 |
| 6pm–7pm | 75.8% | 1.5% | 130 |
| 7pm–8pm | 68.6% | 0.8% | 122 |
| 8pm–9pm | 58.6% | 0.0% | 58 |
Airlines at PSM ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| Allegiant Air | 76.6% | 76.3% | 0.7% | 430 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of PSM
On-time departures by day, 24 months.
Best month to fly out of PSM
On-time departures by month, 24 months.
Holiday travel at Portsmouth (PSM)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 23 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 71.1% | -9.2 pts | 2.2% | 46 |
| Summer peak (Jun 15 - Aug 15) | 69.0% | -11.4 pts | 0.0% | 145 |
| All other days | 80.3% | — | 0.8% | 703 |
Monthly on-time departure trend at PSM
On-time departure % each month, with the 12-month US average for reference.
Routes from Portsmouth (PSM)
Every route from PSM with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| PSM → Punta Gorda (PGD) | 79.6% | 0.8% | 237 |