How reliable is Portsmouth International at Pease Airport?
Flights from PSM departed within 15 minutes of schedule in 78% of 2,383 flights in official BTS history. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Origin-airport operations
What the departure punctuality at PSM looks like
On-time departures
across 2,383 flights
Source: BTS Airport Operations · data through 2026-06-25. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
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Weather by month
Weather history isn’t available for PSM yet
PlaneSane shows month-by-month airport weather once enough historical METAR/IEM observations are loaded for the airport. This does not mean the airport has no weather data forever; it means the current climatology table has no monthly coverage for Portsmouth International at Pease Airport.
The read on PSM
What the numbers say about flying through Portsmouth International at Pease Airport
Across official performance history, flights from Portsmouth left within 15 minutes of schedule about 78% of the time over 2,383 flights. That's a respectable but unspectacular operational record. Pair it with a moderate cancellation rate of 1.3%. When a departure does run late, the typical delay is around 15 minutes.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Portsmouth, read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about PSM
- How reliable is Portsmouth International at Pease Airport (PSM)?
- Flights from Portsmouth left within 15 minutes of schedule roughly 78% of the time across 2,383 flights of official history — a respectable but unspectacular operational record. The cancellation rate runs about 1.3%. It's advisory context, not a guarantee for any single flight.
Planning a trip through Portsmouth?
Score real flights to and from PSM on reliability, weather, and connection safety — not just price.