Oakland International in April 2026

72.6%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 2,509 domestic departures from Oakland International (OAK). 72.6% left less than 15 minutes late and 76.2% reached their destination on time; 0.3% were cancelled.

Nationally that month, 79.1% of flights departed on time and 78.9% arrived on time, so OAK departures were 6.5 points below the national departure figure.

A year earlier, in April 2025, the airport had 3,050 departures with 82.7% leaving on time: a change of −10.1 points, with flights down 18%.

Flights arriving at OAK that month were on time 78.4% of the time (2,508 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 45%, air carrier 38% and national aviation system 17%.

On time 76.2%
Arrived 15+ minutes late 23.5%
Cancelled 0.3%
Diverted 0.1%

Every scheduled departure from OAK 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	OAK, 12 months to Jul 2026	All reported flights, Apr 2026
Departed on time	72.6%	82.7%	75.5%	79.1%
Arrived on time	76.2%	85.0%	78.5%	78.9%
Cancelled	0.3%	0.3%	0.6%	0.9%
Average departure delay (late minutes only)	14.0 min	10.6 min	13.4 min	14.5 min
Scheduled departures a day	84	102	86	19,931
Scheduled departures	2,509	3,050	31,406	597,919

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	2,227	89%	74.6%	7.0 min	0.3%
AS Alaska Airlines	150	6%	90.0%	-1.2 min	0.7%
OO SkyWest Airlines	124	5%	87.9%	-0.7 min	0.0%
G4 Allegiant Air	8	0%	75.0%	-2.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
OAK–LAS	Oakland to Las Vegas	272	74.3%	9.4 min	0.4%
OAK–SAN	Oakland to San Diego	261	58.6%	19.0 min	0.4%
OAK–BUR	Oakland to Burbank	213	82.6%	0.7 min	0.9%
OAK–SNA	Oakland to Santa Ana	195	85.6%	-1.9 min	0.0%
OAK–PHX	Oakland to Phoenix	170	78.2%	6.8 min	0.0%
OAK–LAX	Oakland to Los Angeles	169	78.1%	3.5 min	1.2%
OAK–SLC	Oakland to Salt Lake City	137	86.1%	-2.2 min	0.0%
OAK–DEN	Oakland to Denver	123	71.5%	8.3 min	0.0%
OAK–SEA	Oakland to Seattle	119	74.8%	5.7 min	0.8%
OAK–LGB	Oakland to Long Beach	116	86.2%	-3.0 min	0.0%
OAK–ONT	Oakland to Ontario	115	74.8%	7.0 min	0.0%
OAK–PDX	Oakland to Portland	89	77.5%	8.2 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), April 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2026	Minutes
Air carrier	37.5%	33.5%	10,181
Late-arriving aircraft	44.7%	40.4%	12,147
National Aviation System	17.3%	21.0%	4,699
Extreme weather	0.3%	5.0%	76
Security	0.2%	0.1%	67

27,170 delay minutes on 589 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 OAK on time in April 2026?

72.6% of 2,509 scheduled domestic departures left less than 15 minutes late, and 76.2% 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, 82.7% of 3,050 departures left on time and 0.3% were cancelled, against 72.6% and 0.3% 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 OAK · methodology · corrections.