Airport month record

SJCAUG

Norman Y. Mineta San Jose International in August 2025

Departures: 3,885
Month: August 2025
National, same month: 77.4%
Carriers: 8

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

SJC in August lands a B+, 6 points better than the national rate of 77.4%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 3,885 flights, of which SkyWest Airlines flew 666 at 91.3% on time.

Set against the rest of the country, SJC's August record is 6 points better than the US average of 77.4%. That gap is worth roughly 61 fewer late arrivals for every thousand flights.

On time

83.5%

Arrivals under 15 minutes late, of 3,864 completed departures

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

0.36%

Nationally in August: 1.08%

Whole year

82.9%

SJC across all twelve months

These figures cover 3,885 departures from Norman Y. Mineta San Jose International in August 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

August next to SJC's other months

Against SJC's own year, August ran level with the twelve-month rate of 82.9%, which makes it number six of twelve months, best first. Cancellations were unusually low for SJC in August, at 0.36% against 0.69% across the year. Either side of it, July ran 80.8% on time and September 85.5%, so this month sits in line with its neighbours.

SJC month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025	4,120	80.8%	60 min	0.87%	B+
August 2025 (this page)	3,885	83.5%	54 min	0.36%	B+
September 2025	3,777	85.5%	51 min	0.50%	A+
October 2025	3,865	81.5%	52 min	0.41%	B+
November 2025	3,659	83.0%	57 min	1.12%	B
December 2025	3,622	81.2%	58 min	0.86%	B+
January 2026	3,099	89.3%	61 min	1.19%	A
February 2026	3,088	87.0%	51 min	0.58%	A+
March 2026	3,438	85.6%	59 min	0.96%	A+
April 2026	3,423	84.2%	45 min	0.50%	B+
May 2026	3,686	81.7%	48 min	0.38%	B+
June 2026	3,816	74.3%	50 min	0.58%	C+

Departure window

The best time of day to leave SJC in August

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 22 points, against 10 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am779 flights95.6%
8am–11am757 flights90.3%
11am–2pm816 flights82.3%
2pm–5pm630 flights73.9%
5pm–8pm613 flights74.8%
8pm–5am290 flights75.6%

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 95.6% of the time, against 73.9% for the afternoon window. That is 22 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 816 flights scheduled in it.

Across the week, Tuesday is the strongest day at 91.9% on time and Friday the weakest at 76.7%. 15 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at SJC in August

The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 91.3% of the time; Southwest Airlines manages 81.3%. Sample sizes sit next to every figure, because a two-point gap across 2,324 flights means less than a ten-point one.

Carriers at SJC in August 2025
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines	2,324	81.3%	43 min	0.17%	B+
SkyWest Airlines	666	91.3%	52 min	0.00%	A+
Delta Air Linesthin sample	231	90.7%	104 min	1.73%	A
Alaska Airlinesthin sample	209	79.6%	39 min	1.44%	B
United Airlinesthin sample	144	74.6%	61 min	0.69%	C+
American Airlinesthin sample	140	80.1%	193 min	1.43%	B
Spirit Airlinesthin sample	75	80.0%	83 min	0.00%	B+
Hawaiian Airlinesthin sample	62	96.8%	25 min	0.00%	A+

SkyWest leads Southwest by 10 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Route by route

Busiest routes out of SJC in August

Routes from SJC in August 2025
Route	Flights	On time	Avg delay	Cancelled	Grade
SJC to SAN · San Diego	441	72.3%	40 min	0.00%	C+
SJC to SEA · Seattle	395	80.6%	44 min	0.76%	B+
SJC to LAX · Los Angeles	391	88.2%	46 min	0.00%	A+
SJC to LAS · Las Vegas	381	80.8%	58 min	0.00%	B+
SJC to DEN · Denverthin sample	232	72.3%	53 min	0.00%	C+
SJC to SNA · Santa Anathin sample	219	87.1%	40 min	0.46%	A+
SJC to PHX · Phoenixthin sample	208	85.0%	53 min	0.00%	A+
SJC to BUR · Burbankthin sample	205	83.3%	48 min	0.98%	B+
SJC to SLC · Salt Lake Citythin sample	166	92.7%	131 min	0.60%	A+
SJC to PDX · Portlandthin sample	142	85.2%	43 min	0.00%	A+
SJC to ONT · Ontariothin sample	110	84.5%	33 min	0.00%	B+
SJC to LGB · Long Beachthin sample	106	90.6%	33 min	0.00%	A+
SJC to DFW · Dallas-Fort Worththin sample	102	79.6%	217 min	1.96%	B
SJC to AUS · Austinthin sample	96	84.2%	42 min	0.00%	B+
SJC to ATL · Atlantathin sample	82	91.2%	87 min	2.44%	A
SJC to HNL · Honoluluthin sample	66	87.9%	71 min	0.00%	A+
SJC to BOI · Boisethin sample	62	93.5%	78 min	0.00%	A+
SJC to MSP · Minneapolisthin sample	56	96.4%	60 min	1.79%	A
SJC to MDW · Chicagothin sample	55	79.6%	36 min	0.00%	B+
SJC to DAL · Dallasthin sample	49	81.6%	43 min	0.00%	B+
SJC to OGG · Kahuluithin sample	35	97.1%	32 min	0.00%	A+
SJC to BNA · Nashvillethin sample	31	90.3%	29 min	0.00%	A+
SJC to BWI · Baltimorethin sample	31	93.3%	22 min	3.23%	A−
SJC to HOU · Houstonthin sample	31	96.8%	39 min	0.00%	A+
SJC to GEG · Spokanethin sample	31	90.3%	48 min	0.00%	A+

Delay causes

What held SJC up in August

One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 34,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
45%
Carrier
35%
National Airspace System
20%
Extreme weather
0%

45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 34,000 reported delay minutes here, that single category outweighs weather by 45 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 34,458 reported delay minutes.

Cancellations are rare at 0.36%, below the national 1.08% 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 3.7% land an hour or more behind schedule, against 8.2% 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 SJC in August

For a August trip through SJC: expect 83.5% on time and 0.36% cancelled, going by August 2025. The 5am–8am window was the strongest part of the day.

Norman Y. Mineta San Jose International (SJC), the whole year
SJC in July80.8%
SJC in September85.5%
SJC in October81.5%
SJC in November83.0%
SJC in December81.2%
SJC in January89.3%
SJC in February87.0%
SJC in March85.6%
SJC in April84.2%
SJC in May81.7%
SJC in June74.3%

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