According to PlainFlights' airport traffic ranking (BTS On-Time Performance total flights), Portsmouth, NH (PSM) ranks #335 of 382 tracked US airports by total flights (most flights = #1). Portsmouth, NH posts bottom-quartile on-time performance among the 382 tracked U.S. airports, as a smaller regional airport.
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PSM on-time rate vs. the national average
Ahead of the U.S. average across all 382 tracked airports.
Volume vs. on-time rate
Where Portsmouth, NH sits on volume vs. on-time rate
Among the 382 U.S. airports in the BTS corpus, Portsmouth, NH handles more flight
volume than 12% of them, and has a higher on-time rate than
19% of them, placing it in the quadrant for quiet and delay-prone.
Flight volume and on-time rate are independent figures: a busy airport can still run
reliably, and a quiet one can still run late.
Portsmouth, NH vs. a 29-airport national peer sample, volume percentile vs. on-time-rate percentile.
Total flights (2020-2025): 4,468 ·
On-time rate: 80.6%
Delay Cause Breakdown
Top delay cause: Late Aircraft.
Total delay minutes48,416 min
Late Aircraft19,350 min · 40%
Carrier13,709 min · 28%
NAS (National Aviation System)11,398 min · 24%
Weather3,943 min · 8%
Security16 min · 0%
Source: U.S. DOT Bureau of Transportation Statistics, On-Time Performance
PSM - seasonal on-time pattern
Best: February (91.6%) · worst: June (81.5%)
PSM - on-time rate by year
2020–2025, year-over-year trend.
PSM - taxi-out and taxi-in (monthly)
Average taxi-out 15.8 min · taxi-in 5.7 min over the last 24 reported months (U.S. airport mean taxi-out ≈ 16.4 min).
PSM's average taxi-out (15.8 min) sits near the recent U.S. airport mean (~16.4 min). Month-to-month, it swings from 12.8 min (September 2024) to 23.2 min (February 2025).
Cancellation & Diversion Analysis
Flight disruption statistics for Portsmouth, NH.
Cancellation Rate
1.32%
59 of 4,468 flights
Diversion Rate
0.09%
4 of 4,468 flights
Delay Rate
19.4%
865 of 4,468 flights
Nationwide peers by on-time rate & flight volume
Two PlainFlights-derived comparison paths for Portsmouth, NH, both outside New Hampshire so the neighborhoods are not same-state geography. Axes stay disjoint: volume peers exclude the on-time peer set. Same-state compare stays below.
The standout signal at Portsmouth, NH is the delay mix: Late Aircraft owns 40.0% of 48,416 delay minutes across 4,468 BTS flights. The on-time headline is 80.6% (1.6 pts above the 79% national average), with 865 delayed and 59 cancelled (1.32%).
Delay minutes concentrate in Late Aircraft (40.0% late-aircraft, 28.3% carrier, 23.5% NAS, 8.1% weather, 0.0% security). As a quieter airport, a single late inbound can swing the month more than at a mega-hub.
On the multi-year calendar, PSM is strongest in February (91.6% on-time) and weakest in June (81.5%), a 10.1-point swing. Volume peaks in April (~106 flights/month). Field definitions: on-time performance explained.
Portsmouth, NH vs. the national on-time distribution
On-time rate among all 382 tracked U.S. airports
80.6%Top 81%higher than 19% of 382 airports
Portsmouth, NH
60%95%
U.S. airports by on-time rate, bucketed by value
Each bar is a band; taller bars hold more airports. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data (2020–2025).
Statistics reflect cumulative performance across all available reporting periods. On-time rates exclude cancelled and diverted flights.
PSM's on-time book sits in the slower half of the BTS set; check the delay mix and the worst month before treating the headline as typical.
Compare PSM against airports with a similar on-time rate. Compare airports →
Travel in February rather than June if your dates are flexible. Seasonal patterns →
Gate-to-wheels taxi-out averages 15.8 min here; check the monthly series before a tight connection. Taxi times →
On-time rate reflects the BTS historical average across all reporting carriers at this airport, not any single flight or airline.
Frequently Asked Questions
What is Portsmouth, NH's on-time rate?
Portsmouth, NH (PSM) has a 80.6% on-time rate across 4,468 BTS-tracked flights (2020-2025), 1.6 pts above the 79% national flight-weighted average; that places it in roughly the bottom-quartile on-time performance.
How does PSM rank among U.S. airports by traffic volume?
Portsmouth, NH ranks #335 of 382 tracked US airports by total BTS flights (most flights = #1), making it a smaller regional airport.
What's the most common cause of delays at Portsmouth, NH?
Late Aircraft is the leading delay cause at PSM, accounting for 40.0% of delay minutes. The full breakdown: 40.0% late-aircraft, 28.3% carrier, 23.5% NAS/air-traffic-control, 8.1% weather, and 0.0% security.
When is the best time to fly through Portsmouth, NH?
February is historically PSM's strongest month at 91.6% on-time, while June is the weakest at 81.5%, a 10.1-point swing across the BTS historical record.