Airport month record

PITSEP

Pittsburgh International in September 2025

Departures: 3,672
Month: September 2025
National, same month: 83.4%
Carriers: 11

Historical statistics for September 2025, not live status or a forecast for this year’s September. For today’s conditions at PIT, see live FAA status.

PIT in September earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 3 points better than the national rate of 83.4%. When something does go wrong the average delay runs a little over an hour. That rests on 3,672 flights, of which Southwest Airlines flew 805 at 87.7% on time.

Southwest Airlines is the most reliable of the three carriers covered here at 87.7% on time across 805 flights.

On time

86.2%

Arrivals under 15 minutes late, of 3,644 completed departures

Avg delay

70 min

Across delayed arrivals only, not all flights

Cancelled

0.65%

Nationally in September: 0.51%

Whole year

81.4%

PIT across all twelve months

These figures cover 3,672 departures from Pittsburgh International in September 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.

Against the year

September next to PIT's other months

Against PIT's own year, September ran 5 points better than the twelve-month rate of 81.4%, which makes it the best of the twelve months in the data. Cancellations were unusually low for PIT in September, at 0.65% against 1.92% across the year. Either side of it, August ran 82.6% on time and October 83.0%, so a trip moved by a few weeks would have landed in a worse stretch.

PIT month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025	3,959	76.7%	82 min	3.31%	B−
August 2025	3,841	82.6%	75 min	1.20%	B
September 2025 (this page)	3,672	86.2%	70 min	0.65%	A+
October 2025	3,850	83.0%	62 min	0.81%	B+
November 2025	3,510	84.4%	78 min	1.77%	B
December 2025	3,474	73.2%	72 min	1.50%	C
January 2026	3,099	79.2%	81 min	6.03%	B−
February 2026	2,943	83.6%	63 min	2.68%	B
March 2026	3,434	78.6%	88 min	2.88%	B
April 2026	3,531	85.3%	71 min	0.51%	A+
May 2026	3,778	84.6%	68 min	0.79%	B+
June 2026	3,815	79.1%	85 min	1.68%	B

Departure window

The best time of day to leave PIT in September

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 20 points, against 2 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am904 flights94.7%
8am–11am711 flights92.1%
11am–2pm518 flights89.7%
2pm–5pm613 flights80.0%
5pm–8pm820 flights75.7%
8pm–5am106 flights74.3%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 94.7% of the time, against 74.3% for the overnight window. That is 20 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 904 flights scheduled in it.

Across the week, Tuesday is the strongest day at 89.8% on time and Thursday the weakest at 81.4%. 8 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at PIT in September

The three carriers here are closely matched: 2 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

Carriers at PIT in September 2025
Airline	Flights	On time	Avg delay	Cancelled	Grade
Republic Airways	1,045	86.3%	61 min	1.44%	A
Southwest Airlines	805	87.7%	43 min	0.00%	A+
American Airlines	443	85.4%	130 min	0.90%	A+
United Airlinesthin sample	362	90.1%	50 min	0.00%	A+
Delta Air Linesthin sample	288	93.8%	72 min	0.00%	A+
Spirit Airlinesthin sample	172	84.7%	79 min	1.16%	B
JetBlue Airwaysthin sample	154	72.4%	59 min	1.30%	C
SkyWest Airlinesthin sample	135	81.3%	74 min	0.74%	B+
Allegiant Airthin sample	94	84.0%	96 min	0.00%	B+
PSA Airlinesthin sample	71	78.9%	126 min	0.00%	B+
Alaska Airlinesthin sample	52	84.6%	35 min	0.00%	B+

No carrier stands out. Southwest tops the table at 87.7%, 2 points clear of the bottom, which is inside the range this kind of sample moves year to year.

Route by route

Busiest routes out of PIT in September

Routes from PIT in September 2025
Route	Flights	On time	Avg delay	Cancelled	Grade
PIT to ORD · Chicagothin sample	345	82.3%	63 min	0.29%	B+
PIT to LGA · New Yorkthin sample	294	86.1%	66 min	2.04%	A
PIT to ATL · Atlantathin sample	235	95.7%	87 min	0.00%	A+
PIT to BOS · Bostonthin sample	197	67.5%	53 min	3.05%	C−
PIT to EWR · Newarkthin sample	183	91.0%	72 min	2.73%	A
PIT to JFK · New Yorkthin sample	178	85.8%	74 min	0.56%	A+
PIT to DEN · Denverthin sample	167	86.2%	47 min	0.00%	A+
PIT to MCO · Orlandothin sample	151	83.4%	55 min	0.00%	B+
PIT to CLT · Charlottethin sample	146	89.7%	116 min	0.00%	A+
PIT to PHL · Philadelphiathin sample	122	74.6%	100 min	0.00%	C+
PIT to DFW · Dallas-Fort Worththin sample	120	80.2%	139 min	3.33%	B−
PIT to DCA · Washingtonthin sample	118	89.0%	62 min	0.00%	A+
PIT to MDW · Chicagothin sample	112	86.6%	37 min	0.00%	A+
PIT to IAD · Washingtonthin sample	111	91.9%	36 min	0.00%	A+
PIT to BNA · Nashvillethin sample	94	87.2%	38 min	0.00%	A+
PIT to LAS · Las Vegasthin sample	88	81.8%	42 min	0.00%	B+
PIT to BWI · Baltimorethin sample	86	93.0%	89 min	0.00%	A+
PIT to DTW · Detroitthin sample	86	94.2%	61 min	0.00%	A+
PIT to MSP · Minneapolisthin sample	74	91.9%	77 min	0.00%	A+
PIT to FLL · Fort Lauderdalethin sample	73	83.6%	81 min	0.00%	B+
PIT to TPA · Tampathin sample	63	96.8%	65 min	0.00%	A+
PIT to PHX · Phoenixthin sample	60	79.7%	38 min	0.00%	B+
PIT to RDU · Raleighthin sample	60	85.0%	67 min	0.00%	A+
PIT to MYR · Myrtle Beachthin sample	53	92.3%	133 min	1.89%	A
PIT to SEA · Seattlethin sample	52	84.6%	35 min	0.00%	B+

Delay causes

What held PIT up in September

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 35,000 reported delay minutes.

Late-arriving aircraft
33%
Carrier
33%
National Airspace System
30%
Extreme weather
4%

The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 94.7% on time here. The split is drawn from 35,109 reported delay minutes.

Cancellations are rare at 0.65%, below the national 0.51% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Badly late arrivals are rare here: only 4.6% land an hour or more behind schedule, against 5.4% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

What to do with this

Flying from PIT in September

For a September trip through PIT: this is one of the better months to be flying from here, 86.2% on time with 0.65% cancelled. That is a base rate for the month as a whole; a single storm can still spoil a particular day.

Pittsburgh International (PIT), the whole year
PIT in July76.7%
PIT in August82.6%
PIT in October83.0%
PIT in November84.4%
PIT in December73.2%
PIT in January79.2%
PIT in February83.6%
PIT in March78.6%
PIT in April85.3%
PIT in May84.6%
PIT in June79.1%

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures