San Francisco International in April 2025

86.1%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 April 2025, reporting carriers scheduled 12,173 domestic departures from San Francisco International (SFO). 86.1% left less than 15 minutes late and 86.2% reached their destination on time; 0.3% were cancelled.

Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so SFO departures were 5.5 points above the national departure figure.

A year earlier, in April 2024, the airport had 10,622 departures with 70.3% leaving on time: a change of +15.8 points, with flights up 15%.

Flights arriving at SFO that month were on time 80.7% of the time (12,172 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 43%, air carrier 34% and national aviation system 21%.

On time 86.2%
Arrived 15+ minutes late 13.3%
Cancelled 0.3%
Diverted 0.2%

Every scheduled departure from SFO in April 2025, judged by arrival at the destination.

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

Measure	Apr 2025	Apr 2024	SFO, 12 months to Jul 2026	All reported flights, Apr 2025
Departed on time	86.1%	70.3%	75.1%	80.6%
Arrived on time	86.2%	73.2%	75.6%	79.5%
Cancelled	0.3%	0.8%	1.0%	0.8%
Average departure delay (late minutes only)	9.9 min	20.9 min	17.8 min	14.1 min
Scheduled departures a day	406	354	404	19,465
Scheduled departures	12,173	10,622	147,566	583,950

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	4,596	38%	90.0%	-7.7 min	0.2%
OO SkyWest Airlines	3,150	26%	85.8%	-1.2 min	0.1%
DL Delta Air Lines	1,095	9%	89.4%	-5.2 min	0.2%
AA American Airlines	1,023	8%	82.0%	5.0 min	0.7%
AS Alaska Airlines	868	7%	81.9%	1.4 min	0.5%
WN Southwest Airlines	627	5%	76.1%	7.2 min	0.0%
F9 Frontier Airlines	371	3%	70.6%	21.5 min	0.8%
B6 JetBlue Airways	353	3%	87.5%	-4.8 min	0.3%
HA Hawaiian Airlines	90	1%	81.1%	0.8 min	1.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SFO–LAX	San Francisco to Los Angeles	920	86.6%	-3.4 min	0.2%
SFO–JFK	San Francisco to New York	579	87.6%	-9.1 min	0.3%
SFO–SEA	San Francisco to Seattle	540	84.1%	-3.5 min	0.7%
SFO–SAN	San Francisco to San Diego	527	78.4%	6.4 min	0.2%
SFO–LAS	San Francisco to Las Vegas	498	83.5%	1.6 min	0.2%
SFO–PHX	San Francisco to Phoenix	498	84.5%	2.7 min	0.0%
SFO–DEN	San Francisco to Denver	463	83.2%	5.4 min	0.0%
SFO–ORD	San Francisco to Chicago	448	86.8%	-4.2 min	0.2%
SFO–EWR	San Francisco to Newark	401	75.3%	3.8 min	1.0%
SFO–BOS	San Francisco to Boston	368	91.6%	-11.1 min	0.0%
SFO–SNA	San Francisco to Santa Ana	359	86.1%	-2.1 min	0.6%
SFO–DFW	San Francisco to Dallas/Fort Worth	347	74.9%	19.8 min	1.7%

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), April 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2025	Minutes
Air carrier	33.7%	32.7%	35,381
Late-arriving aircraft	42.7%	39.4%	44,880
National Aviation System	21.2%	22.2%	22,314
Extreme weather	2.2%	5.5%	2,335
Security	0.1%	0.2%	101

105,011 delay minutes on 1,622 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 SFO on time in April 2025?

86.1% of 12,173 scheduled domestic departures left less than 15 minutes late, and 86.2% reached their destination on time. The national figures that month were 80.6% and 79.5%.

How does that compare with a year earlier?

In April 2024, 70.3% of 10,622 departures left on time and 0.8% were cancelled, against 86.1% and 0.3% in April 2025.

Provenance

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