San Francisco International in April 2026

72.9%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 2026, reporting carriers scheduled 12,401 domestic departures from San Francisco International (SFO). 72.9% left less than 15 minutes late and 74.0% reached their destination on time; 0.7% were cancelled.

Nationally that month, 79.1% of flights departed on time and 78.9% arrived on time, so SFO departures were 6.2 points below the national departure figure.

A year earlier, in April 2025, the airport had 12,173 departures with 86.1% leaving on time: a change of −13.2 points, with flights up 2%.

Flights arriving at SFO that month were on time 59.3% of the time (12,413 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 46%, air carrier 31% and national aviation system 21%.

On time 74.0%
Arrived 15+ minutes late 25.0%
Cancelled 0.7%
Diverted 0.3%

Every scheduled departure from SFO in April 2026, judged by arrival at the destination.

April 2026 against a year earlier, the airport's year and the nation

Measure	Apr 2026	Apr 2025	SFO, 12 months to Jul 2026	All reported flights, Apr 2026
Departed on time	72.9%	86.1%	75.1%	79.1%
Arrived on time	74.0%	86.2%	75.6%	78.9%
Cancelled	0.7%	0.3%	1.0%	0.9%
Average departure delay (late minutes only)	18.1 min	9.9 min	17.8 min	14.5 min
Scheduled departures a day	413	406	404	19,931
Scheduled departures	12,401	12,173	147,566	597,919

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	5,257	42%	81.3%	-1.6 min	0.2%
OO SkyWest Airlines	2,557	21%	69.2%	12.7 min	1.7%
DL Delta Air Lines	1,160	9%	74.0%	12.0 min	0.5%
AA American Airlines	997	8%	72.6%	15.6 min	0.7%
AS Alaska Airlines	964	8%	71.4%	8.8 min	0.7%
WN Southwest Airlines	835	7%	51.3%	24.5 min	1.0%
B6 JetBlue Airways	357	3%	77.6%	0.4 min	0.0%
F9 Frontier Airlines	274	2%	57.3%	24.7 min	1.8%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SFO–LAX	San Francisco to Los Angeles	987	69.0%	11.8 min	0.9%
SFO–JFK	San Francisco to New York	543	79.6%	2.6 min	0.0%
SFO–ORD	San Francisco to Chicago	523	69.8%	13.1 min	1.3%
SFO–SAN	San Francisco to San Diego	514	61.9%	15.2 min	0.2%
SFO–LAS	San Francisco to Las Vegas	504	59.9%	17.7 min	0.6%
SFO–SEA	San Francisco to Seattle	496	69.6%	9.9 min	0.0%
SFO–PHX	San Francisco to Phoenix	432	68.8%	16.4 min	1.2%
SFO–DEN	San Francisco to Denver	426	74.2%	2.9 min	0.7%
SFO–BOS	San Francisco to Boston	381	76.4%	-0.8 min	0.3%
SFO–EWR	San Francisco to Newark	381	87.1%	-9.2 min	0.5%
SFO–SNA	San Francisco to Santa Ana	368	71.2%	7.5 min	1.6%
SFO–DFW	San Francisco to Dallas/Fort Worth	337	65.6%	16.2 min	0.6%

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 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2026	Minutes
Air carrier	31.2%	33.5%	60,818
Late-arriving aircraft	45.8%	40.4%	89,188
National Aviation System	21.4%	21.0%	41,628
Extreme weather	1.6%	5.0%	3,145
Security	0.0%	0.1%	76

194,855 delay minutes on 3,105 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 2026?

72.9% of 12,401 scheduled domestic departures left less than 15 minutes late, and 74.0% reached their destination on time. The national figures that month were 79.1% and 78.9%.

How does that compare with a year earlier?

In April 2025, 86.1% of 12,173 departures left on time and 0.3% were cancelled, against 72.9% and 0.7% in April 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for April 2026; 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.