San Diego International in September 2025

78.1%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In September 2025, reporting carriers scheduled 7,875 domestic departures from San Diego International (SAN). 78.1% left less than 15 minutes late and 80.6% reached their destination on time; 1.4% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so SAN departures were 5.0 points below the national departure figure.

A year earlier, in September 2024, the airport had 7,942 departures with 82.1% leaving on time: a change of −4.0 points, with flights down 1%.

Flights arriving at SAN that month were on time 77.2% of the time (7,875 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 51%, air carrier 24% and national aviation system 21%.

On time 80.6%
Arrived 15+ minutes late 17.8%
Cancelled 1.4%
Diverted 0.2%

Every scheduled departure from SAN in September 2025, judged by arrival at the destination.

September 2025 against a year earlier, the airport's year and the nation

Measure	Sep 2025	Sep 2024	SAN, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	78.1%	82.1%	73.5%	83.1%
Arrived on time	80.6%	78.6%	76.1%	82.8%
Cancelled	1.4%	0.3%	1.3%	0.5%
Average departure delay (late minutes only)	15.8 min	11.0 min	16.6 min	12.2 min
Scheduled departures a day	263	265	275	18,748
Scheduled departures	7,875	7,942	100,196	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	2,856	36%	77.1%	6.1 min	1.1%
OO SkyWest Airlines	1,145	15%	82.6%	-0.4 min	1.9%
AS Alaska Airlines	970	12%	80.5%	0.8 min	2.0%
UA United Airlines	886	11%	84.0%	-0.3 min	1.4%
DL Delta Air Lines	786	10%	87.3%	0.6 min	0.8%
AA American Airlines	725	9%	82.3%	9.7 min	1.2%
F9 Frontier Airlines	202	3%	77.7%	16.7 min	1.0%
B6 JetBlue Airways	118	1%	78.0%	9.7 min	2.5%
NK Spirit Airlines	105	1%	82.9%	-0.6 min	3.8%
HA Hawaiian Airlines	81	1%	63.0%	22.5 min	0.0%
G4 Allegiant Air	1	0%	100.0%	-23.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SAN–LAS	San Diego to Las Vegas	610	77.5%	8.1 min	1.6%
SAN–SFO	San Diego to San Francisco	581	71.9%	9.2 min	1.9%
SAN–PHX	San Diego to Phoenix	500	77.8%	9.8 min	2.8%
SAN–SMF	San Diego to Sacramento	416	80.3%	2.8 min	1.0%
SAN–DEN	San Diego to Denver	411	77.4%	5.9 min	0.7%
SAN–SJC	San Diego to San Jose	398	78.6%	4.5 min	1.5%
SAN–SEA	San Diego to Seattle	388	84.0%	4.4 min	1.3%
SAN–OAK	San Diego to Oakland	274	73.4%	9.4 min	0.7%
SAN–ORD	San Diego to Chicago	269	82.5%	-2.4 min	0.4%
SAN–DFW	San Diego to Dallas/Fort Worth	265	77.0%	6.5 min	2.6%
SAN–ATL	San Diego to Atlanta	217	88.9%	-2.9 min	0.0%
SAN–LAX	San Diego to Los Angeles	209	88.5%	-5.9 min	1.0%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	23.6%	34.3%	24,496
Late-arriving aircraft	50.8%	37.4%	52,763
National Aviation System	20.6%	22.6%	21,402
Extreme weather	4.8%	5.6%	4,958
Security	0.2%	0.1%	170

103,789 delay minutes on 1,404 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left SAN on time in September 2025?

78.1% of 7,875 scheduled domestic departures left less than 15 minutes late, and 80.6% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 82.1% of 7,942 departures left on time and 0.3% were cancelled, against 78.1% and 1.4% in September 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for SAN · methodology · corrections.