Salt Lake City International in May 2025

84.8%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 2025, reporting carriers scheduled 9,923 domestic departures from Salt Lake City International (SLC). 84.8% left less than 15 minutes late and 83.8% reached their destination on time; 0.2% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so SLC departures were 8.1 points above the national departure figure.

A year earlier, in May 2024, the airport had 9,621 departures with 81.9% leaving on time: a change of +2.9 points, with flights up 3%.

Flights arriving at SLC that month were on time 85.5% of the time (9,925 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 45%, national aviation system 28% and late-arriving aircraft 25%.

On time 83.8%
Arrived 15+ minutes late 15.8%
Cancelled 0.2%
Diverted 0.3%

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

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

Measure	May 2025	May 2024	SLC, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	84.8%	81.9%	84.0%	76.7%
Arrived on time	83.8%	81.5%	83.8%	75.4%
Cancelled	0.2%	0.4%	0.8%	1.0%
Average departure delay (late minutes only)	10.8 min	12.5 min	11.0 min	17.5 min
Scheduled departures a day	331	321	323	20,188
Scheduled departures	9,923	9,621	117,896	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
DL Delta Air Lines	4,753	48%	81.6%	3.2 min	0.0%
OO SkyWest Airlines	3,095	31%	92.5%	-5.0 min	0.1%
WN Southwest Airlines	961	10%	79.5%	6.1 min	0.2%
UA United Airlines	343	3%	70.8%	18.1 min	0.6%
AA American Airlines	315	3%	77.5%	12.2 min	2.5%
F9 Frontier Airlines	220	2%	73.6%	12.3 min	0.5%
AS Alaska Airlines	114	1%	53.5%	16.1 min	0.9%
NK Spirit Airlines	34	0%	70.6%	20.9 min	2.9%
B6 JetBlue Airways	31	0%	77.4%	-4.0 min	0.0%
HA Hawaiian Airlines	31	0%	80.6%	13.0 min	3.2%
MQ Envoy Air	26	0%	84.6%	-8.8 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SLC–DEN	Salt Lake City to Denver	644	67.1%	19.2 min	0.2%
SLC–PHX	Salt Lake City to Phoenix	496	89.7%	0.3 min	0.0%
SLC–SEA	Salt Lake City to Seattle	360	73.6%	5.1 min	0.3%
SLC–LAS	Salt Lake City to Las Vegas	342	80.1%	6.1 min	0.6%
SLC–LAX	Salt Lake City to Los Angeles	335	89.0%	-4.8 min	0.0%
SLC–SFO	Salt Lake City to San Francisco	327	85.0%	-0.1 min	0.3%
SLC–DFW	Salt Lake City to Dallas/Fort Worth	320	73.8%	14.9 min	1.9%
SLC–ORD	Salt Lake City to Chicago	271	79.0%	11.8 min	0.0%
SLC–ATL	Salt Lake City to Atlanta	249	83.5%	1.9 min	0.0%
SLC–PDX	Salt Lake City to Portland	220	91.8%	-5.3 min	0.0%
SLC–SAN	Salt Lake City to San Diego	211	88.6%	-1.3 min	0.0%
SLC–SGU	Salt Lake City to St. George	175	94.9%	-6.2 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), May 2025.

Delay causes

BTS cause category	Share of delay minutes	National, May 2025	Minutes
Air carrier	45.3%	29.3%	44,797
Late-arriving aircraft	25.3%	37.8%	24,993
National Aviation System	27.5%	25.9%	27,214
Extreme weather	1.8%	6.9%	1,808
Security	0.0%	0.1%	22

98,834 delay minutes on 1,564 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 May 2025?

84.8% of 9,923 scheduled domestic departures left less than 15 minutes late, and 83.8% reached their destination on time. The national figures that month were 76.7% and 75.4%.

How does that compare with a year earlier?

In May 2024, 81.9% of 9,621 departures left on time and 0.4% were cancelled, against 84.8% and 0.2% in May 2025.

Provenance

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