San Diego International in August 2025

76.2%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 August 2025, reporting carriers scheduled 8,406 domestic departures from San Diego International (SAN). 76.2% left less than 15 minutes late and 75.9% reached their destination on time; 0.7% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so SAN departures were 0.6 points below the national departure figure.

A year earlier, in August 2024, the airport had 8,577 departures with 80.0% leaving on time: a change of −3.8 points, with flights down 2%.

Flights arriving at SAN that month were on time 75.4% of the time (8,407 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 42%, air carrier 31% and national aviation system 24%.

On time 75.9%
Arrived 15+ minutes late 23.0%
Cancelled 0.7%
Diverted 0.3%

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

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

Measure	Aug 2025	Aug 2024	SAN, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	76.2%	80.0%	73.5%	76.8%
Arrived on time	75.9%	76.3%	76.1%	76.3%
Cancelled	0.7%	0.8%	1.3%	1.1%
Average departure delay (late minutes only)	14.8 min	12.5 min	16.6 min	17.6 min
Scheduled departures a day	280	286	275	20,079
Scheduled departures	8,406	8,577	100,196	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	2,940	35%	75.0%	6.0 min	0.2%
OO SkyWest Airlines	1,284	15%	79.9%	3.1 min	0.4%
AS Alaska Airlines	990	12%	68.0%	11.5 min	1.8%
UA United Airlines	916	11%	77.3%	6.9 min	0.8%
DL Delta Air Lines	830	10%	84.7%	-1.0 min	0.5%
AA American Airlines	787	9%	73.8%	13.2 min	1.9%
F9 Frontier Airlines	259	3%	66.0%	24.2 min	3.1%
B6 JetBlue Airways	150	2%	88.0%	-0.8 min	0.7%
NK Spirit Airlines	143	2%	80.4%	5.6 min	0.0%
HA Hawaiian Airlines	85	1%	58.8%	17.6 min	0.0%
G4 Allegiant Air	22	0%	86.4%	10.2 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SAN–LAS	San Diego to Las Vegas	656	76.4%	5.5 min	0.6%
SAN–SFO	San Diego to San Francisco	593	69.3%	11.9 min	0.8%
SAN–PHX	San Diego to Phoenix	473	72.7%	12.7 min	0.6%
SAN–SMF	San Diego to Sacramento	442	77.6%	3.6 min	0.2%
SAN–SJC	San Diego to San Jose	441	81.6%	2.2 min	0.0%
SAN–DEN	San Diego to Denver	436	71.8%	9.8 min	0.7%
SAN–SEA	San Diego to Seattle	426	67.8%	11.7 min	2.1%
SAN–ORD	San Diego to Chicago	320	70.3%	20.2 min	0.9%
SAN–DFW	San Diego to Dallas/Fort Worth	296	68.2%	15.3 min	4.4%
SAN–OAK	San Diego to Oakland	282	76.2%	3.5 min	0.7%
SAN–ATL	San Diego to Atlanta	229	80.8%	-0.9 min	0.9%
SAN–JFK	San Diego to New York	211	83.9%	-2.7 min	0.0%

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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	30.7%	33.1%	34,637
Late-arriving aircraft	42.1%	40.5%	47,471
National Aviation System	23.7%	19.2%	26,744
Extreme weather	3.4%	7.0%	3,818
Security	0.2%	0.1%	194

112,864 delay minutes on 1,935 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 August 2025?

76.2% of 8,406 scheduled domestic departures left less than 15 minutes late, and 75.9% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 80.0% of 8,577 departures left on time and 0.8% were cancelled, against 76.2% and 0.7% in August 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 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.