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Airport Reliability

PSM · Portsmouth

Portsmouth, NH (PSM)

78%
Departures within 15 minutes
16 min
Average departure delay
83%
Arrivals within 15 minutes
0.7%
Departures cancelled

Based on 437 departures and 437 arrivals. Data through May 2026.

What the data says

Morning flights do better here.

Departures from PSM departing between 9 AM–12 PM arrived on time 82% of the time, versus 60% between 3–6 PM.

Sunday scaries are real for this one.

Departures from PSM arrived on time 94% of the time on Fridays and just 69% on Sundays. That gap is worth planning around.

When PSM gets messy

On-time by departure window
  • 9 AM–12 PM82%(176 flights)
  • 12–3 PM82%(81 flights)
  • 3–6 PM60%(15 flights)
  • 6–9 PM70%(162 flights)
On-time by weekday
  • Mon78%(68 flights)
  • Tue73%(11 flights)
  • Wed73%(60 flights)
  • Thu78%(69 flights)
  • Fri94%(70 flights)
  • Sat69%(86 flights)
  • Sun69%(70 flights)
On-time trend by month
76%
May

Jun 64% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%36
July 202568%40
August 202582%38
September 202586%21
October 202580%40
November 202580%35
December 202575%32
January 202675%24
February 202683%36
March 202661%36
April 202688%50
May 202676%46

Airlines departing PSM

Busiest routes from PSM

Based on 437 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.