Salt Lake City International in April 2025

86.4%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 April 2025, reporting carriers scheduled 9,515 domestic departures from Salt Lake City International (SLC). 86.4% left less than 15 minutes late and 84.2% reached their destination on time; 0.2% were cancelled.

Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so SLC departures were 5.8 points above the national departure figure.

A year earlier, in April 2024, the airport had 9,336 departures with 84.9% leaving on time: a change of +1.5 points, with flights up 2%.

Flights arriving at SLC that month were on time 86.2% of the time (9,508 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 46%, late-arriving aircraft 28% and national aviation system 24%.

On time 84.2%
Arrived 15+ minutes late 15.3%
Cancelled 0.2%
Diverted 0.2%

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

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

Measure	Apr 2025	Apr 2024	SLC, 12 months to Jul 2026	All reported flights, Apr 2025
Departed on time	86.4%	84.9%	84.0%	80.6%
Arrived on time	84.2%	84.4%	83.8%	79.5%
Cancelled	0.2%	0.2%	0.8%	0.8%
Average departure delay (late minutes only)	9.3 min	10.7 min	11.0 min	14.1 min
Scheduled departures a day	317	311	323	19,465
Scheduled departures	9,515	9,336	117,896	583,950

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
DL Delta Air Lines	4,676	49%	82.7%	1.7 min	0.0%
OO SkyWest Airlines	2,838	30%	91.5%	-5.6 min	0.1%
WN Southwest Airlines	968	10%	78.4%	6.3 min	0.2%
UA United Airlines	307	3%	81.4%	3.7 min	1.0%
AA American Airlines	304	3%	71.7%	17.6 min	2.3%
F9 Frontier Airlines	246	3%	78.5%	7.6 min	1.2%
AS Alaska Airlines	90	1%	64.4%	7.3 min	1.1%
B6 JetBlue Airways	30	0%	76.7%	9.1 min	0.0%
HA Hawaiian Airlines	30	0%	83.3%	-2.5 min	0.0%
NK Spirit Airlines	23	0%	82.6%	1.4 min	0.0%
MQ Envoy Air	3	0%	100.0%	-11.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SLC–DEN	Salt Lake City to Denver	635	72.1%	13.1 min	0.3%
SLC–PHX	Salt Lake City to Phoenix	511	81.6%	3.1 min	0.6%
SLC–LAX	Salt Lake City to Los Angeles	359	90.0%	-3.9 min	0.0%
SLC–SFO	Salt Lake City to San Francisco	328	80.8%	-0.8 min	0.0%
SLC–LAS	Salt Lake City to Las Vegas	322	75.8%	8.4 min	0.0%
SLC–DFW	Salt Lake City to Dallas/Fort Worth	316	68.4%	21.7 min	2.2%
SLC–SEA	Salt Lake City to Seattle	307	82.4%	-4.6 min	0.3%
SLC–ORD	Salt Lake City to Chicago	264	80.3%	3.0 min	1.5%
SLC–ATL	Salt Lake City to Atlanta	241	76.3%	6.6 min	0.0%
SLC–SAN	Salt Lake City to San Diego	229	83.8%	4.0 min	0.0%
SLC–PDX	Salt Lake City to Portland	208	91.8%	-4.2 min	0.0%
SLC–IAH	Salt Lake City to Houston	176	83.5%	4.5 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), April 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2025	Minutes
Air carrier	46.1%	32.7%	39,189
Late-arriving aircraft	27.8%	39.4%	23,625
National Aviation System	23.9%	22.2%	20,279
Extreme weather	2.2%	5.5%	1,834
Security	0.0%	0.2%	0

84,927 delay minutes on 1,460 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 April 2025?

86.4% of 9,515 scheduled domestic departures left less than 15 minutes late, and 84.2% reached their destination on time. The national figures that month were 80.6% and 79.5%.

How does that compare with a year earlier?

In April 2024, 84.9% of 9,336 departures left on time and 0.2% were cancelled, against 86.4% and 0.2% in April 2025.

Provenance

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