Oakland International in May 2026

73.4%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 2026, reporting carriers scheduled 2,683 domestic departures from Oakland International (OAK). 73.4% left less than 15 minutes late and 75.6% reached their destination on time; 0.6% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so OAK departures were 3.7 points below the national departure figure.

A year earlier, in May 2025, the airport had 3,216 departures with 82.8% leaving on time: a change of −9.4 points, with flights down 17%.

Flights arriving at OAK that month were on time 75.3% of the time (2,677 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 52%, air carrier 33% and national aviation system 14%.

On time 75.6%
Arrived 15+ minutes late 23.7%
Cancelled 0.6%
Diverted 0.1%

Every scheduled departure from OAK in May 2026, judged by arrival at the destination.

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

Measure	May 2026	May 2025	OAK, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	73.4%	82.8%	75.5%	77.1%
Arrived on time	75.6%	84.5%	78.5%	77.6%
Cancelled	0.6%	0.4%	0.6%	0.9%
Average departure delay (late minutes only)	14.4 min	9.6 min	13.4 min	16.0 min
Scheduled departures a day	89	107	86	20,391
Scheduled departures	2,683	3,216	31,406	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	2,303	86%	74.4%	7.5 min	0.6%
OO SkyWest Airlines	217	8%	78.3%	3.8 min	0.5%
AS Alaska Airlines	155	6%	90.3%	-3.7 min	1.3%
G4 Allegiant Air	8	0%	62.5%	35.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
OAK–SAN	Oakland to San Diego	339	60.2%	16.5 min	0.6%
OAK–LAS	Oakland to Las Vegas	285	71.2%	9.8 min	1.4%
OAK–BUR	Oakland to Burbank	219	83.1%	3.2 min	1.4%
OAK–SNA	Oakland to Santa Ana	201	90.5%	-6.3 min	1.0%
OAK–PHX	Oakland to Phoenix	179	72.1%	9.5 min	0.0%
OAK–LAX	Oakland to Los Angeles	176	78.4%	3.5 min	0.0%
OAK–SLC	Oakland to Salt Lake City	141	81.6%	5.9 min	0.0%
OAK–DEN	Oakland to Denver	128	64.8%	12.5 min	0.8%
OAK–SEA	Oakland to Seattle	124	80.6%	0.9 min	0.0%
OAK–LGB	Oakland to Long Beach	118	87.3%	-3.3 min	0.8%
OAK–ONT	Oakland to Ontario	117	74.4%	6.4 min	0.0%
OAK–PDX	Oakland to Portland	111	70.3%	11.5 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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	32.8%	33.0%	10,383
Late-arriving aircraft	52.3%	40.4%	16,565
National Aviation System	14.0%	20.5%	4,432
Extreme weather	1.0%	6.0%	308
Security	0.0%	0.1%	9

31,697 delay minutes on 636 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 May 2026?

73.4% of 2,683 scheduled domestic departures left less than 15 minutes late, and 75.6% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 82.8% of 3,216 departures left on time and 0.4% were cancelled, against 73.4% and 0.6% in May 2026.

Provenance

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