San Diego International in May 2025

79.2%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 May 2025, reporting carriers scheduled 8,455 domestic departures from San Diego International (SAN). 79.2% left less than 15 minutes late and 77.6% reached their destination on time; 0.6% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so SAN departures were 2.5 points above the national departure figure.

A year earlier, in May 2024, the airport had 7,936 departures with 76.4% leaving on time: a change of +2.8 points, with flights up 7%.

Flights arriving at SAN that month were on time 76.9% of the time (8,454 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 39%, air carrier 28% and national aviation system 28%.

On time 77.6%
Arrived 15+ minutes late 21.6%
Cancelled 0.6%
Diverted 0.2%

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

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

Measure	May 2025	May 2024	SAN, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	79.2%	76.4%	73.5%	76.7%
Arrived on time	77.6%	76.8%	76.1%	75.4%
Cancelled	0.6%	0.8%	1.3%	1.0%
Average departure delay (late minutes only)	14.4 min	16.6 min	16.6 min	17.5 min
Scheduled departures a day	282	265	275	20,188
Scheduled departures	8,455	7,936	100,196	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	2,984	35%	75.8%	7.1 min	0.3%
OO SkyWest Airlines	1,391	16%	77.9%	6.9 min	0.5%
AS Alaska Airlines	921	11%	78.6%	3.9 min	0.5%
UA United Airlines	904	11%	77.2%	8.5 min	1.0%
DL Delta Air Lines	844	10%	81.5%	3.7 min	0.1%
AA American Airlines	831	10%	81.0%	6.7 min	1.2%
F9 Frontier Airlines	200	2%	66.0%	23.4 min	1.5%
NK Spirit Airlines	152	2%	82.9%	6.9 min	1.3%
B6 JetBlue Airways	147	2%	78.9%	0.4 min	1.4%
HA Hawaiian Airlines	63	1%	77.8%	18.9 min	1.6%
G4 Allegiant Air	18	0%	66.7%	28.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SAN–LAS	San Diego to Las Vegas	653	71.8%	14.3 min	0.6%
SAN–SFO	San Diego to San Francisco	597	77.9%	5.7 min	0.2%
SAN–SJC	San Diego to San Jose	483	76.2%	7.9 min	0.4%
SAN–PHX	San Diego to Phoenix	468	80.6%	3.0 min	0.6%
SAN–DEN	San Diego to Denver	464	67.2%	17.4 min	1.1%
SAN–SMF	San Diego to Sacramento	444	79.1%	4.4 min	0.2%
SAN–SEA	San Diego to Seattle	416	79.3%	3.8 min	0.2%
SAN–DFW	San Diego to Dallas/Fort Worth	300	68.3%	27.8 min	2.3%
SAN–OAK	San Diego to Oakland	298	77.2%	4.5 min	0.7%
SAN–ORD	San Diego to Chicago	276	86.6%	-1.1 min	0.0%
SAN–LAX	San Diego to Los Angeles	229	93.0%	-3.6 min	0.0%
SAN–ATL	San Diego to Atlanta	228	83.8%	0.8 min	0.4%

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), May 2025.

Delay causes

BTS cause category	Share of delay minutes	National, May 2025	Minutes
Air carrier	27.7%	29.3%	31,336
Late-arriving aircraft	38.7%	37.8%	43,802
National Aviation System	27.5%	25.9%	31,061
Extreme weather	6.0%	6.9%	6,800
Security	0.1%	0.1%	92

113,091 delay minutes on 1,824 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 May 2025?

79.2% of 8,455 scheduled domestic departures left less than 15 minutes late, and 77.6% reached their destination on time. The national figures that month were 76.7% and 75.4%.

How does that compare with a year earlier?

In May 2024, 76.4% of 7,936 departures left on time and 0.8% were cancelled, against 79.2% and 0.6% in May 2025.

Provenance

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