Salt Lake City International in September 2025

88.6%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 September 2025, reporting carriers scheduled 9,344 domestic departures from Salt Lake City International (SLC). 88.6% left less than 15 minutes late and 87.8% reached their destination on time; 0.2% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so SLC departures were 5.5 points above the national departure figure.

A year earlier, in September 2024, the airport had 9,281 departures with 87.0% leaving on time: a change of +1.6 points, with flights up 1%.

Flights arriving at SLC that month were on time 88.8% of the time (9,319 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 50%, late-arriving aircraft 27% and national aviation system 21%.

On time 87.8%
Arrived 15+ minutes late 11.8%
Cancelled 0.2%
Diverted 0.2%

Every scheduled departure from SLC in September 2025, judged by arrival at the destination.

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

Measure	Sep 2025	Sep 2024	SLC, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	88.6%	87.0%	84.0%	83.1%
Arrived on time	87.8%	86.4%	83.8%	82.8%
Cancelled	0.2%	0.1%	0.8%	0.5%
Average departure delay (late minutes only)	8.1 min	9.1 min	11.0 min	12.2 min
Scheduled departures a day	312	309	323	18,748
Scheduled departures	9,344	9,281	117,896	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
DL Delta Air Lines	4,393	47%	86.9%	-0.1 min	0.1%
OO SkyWest Airlines	2,850	31%	94.3%	-6.9 min	0.0%
WN Southwest Airlines	896	10%	82.9%	2.9 min	0.2%
UA United Airlines	374	4%	84.5%	2.5 min	0.3%
AA American Airlines	287	3%	76.0%	15.5 min	1.0%
F9 Frontier Airlines	260	3%	73.5%	16.4 min	0.8%
AS Alaska Airlines	133	1%	80.5%	-1.2 min	0.8%
NK Spirit Airlines	65	1%	76.9%	1.8 min	3.1%
B6 JetBlue Airways	32	0%	87.5%	-1.8 min	0.0%
HA Hawaiian Airlines	30	0%	90.0%	-13.6 min	0.0%
MQ Envoy Air	24	0%	87.5%	-11.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SLC–DEN	Salt Lake City to Denver	644	80.1%	6.3 min	0.2%
SLC–PHX	Salt Lake City to Phoenix	413	86.9%	0.1 min	0.2%
SLC–SEA	Salt Lake City to Seattle	398	81.7%	0.9 min	0.3%
SLC–LAX	Salt Lake City to Los Angeles	338	84.0%	-1.4 min	0.6%
SLC–LAS	Salt Lake City to Las Vegas	314	76.4%	8.6 min	0.6%
SLC–DFW	Salt Lake City to Dallas/Fort Worth	308	79.9%	13.8 min	1.0%
SLC–SFO	Salt Lake City to San Francisco	250	80.4%	4.8 min	0.0%
SLC–ORD	Salt Lake City to Chicago	244	81.1%	3.1 min	0.4%
SLC–ATL	Salt Lake City to Atlanta	241	91.3%	-5.3 min	0.0%
SLC–SAN	Salt Lake City to San Diego	180	87.2%	-1.9 min	1.1%
SLC–SMF	Salt Lake City to Sacramento	180	90.6%	-5.2 min	0.0%
SLC–PDX	Salt Lake City to Portland	176	92.6%	-7.8 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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	49.7%	34.3%	34,158
Late-arriving aircraft	26.6%	37.4%	18,244
National Aviation System	20.7%	22.6%	14,193
Extreme weather	2.9%	5.6%	2,018
Security	0.1%	0.1%	48

68,661 delay minutes on 1,101 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 SLC on time in September 2025?

88.6% of 9,344 scheduled domestic departures left less than 15 minutes late, and 87.8% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 87.0% of 9,281 departures left on time and 0.1% were cancelled, against 88.6% and 0.2% in September 2025.

Provenance

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