Salt Lake City International in December 2025

80.9%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 December 2025, reporting carriers scheduled 9,740 domestic departures from Salt Lake City International (SLC). 80.9% left less than 15 minutes late and 82.8% reached their destination on time; 0.8% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so SLC departures were 8.9 points above the national departure figure.

A year earlier, in December 2024, the airport had 9,496 departures with 82.6% leaving on time: a change of −1.7 points, with flights up 3%.

Flights arriving at SLC that month were on time 80.2% of the time (9,733 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 50%, late-arriving aircraft 30% and national aviation system 18%.

On time 82.8%
Arrived 15+ minutes late 16.0%
Cancelled 0.8%
Diverted 0.3%

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

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

Measure	Dec 2025	Dec 2024	SLC, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	80.9%	82.6%	84.0%	72.0%
Arrived on time	82.8%	82.0%	83.8%	71.9%
Cancelled	0.8%	0.3%	0.8%	1.5%
Average departure delay (late minutes only)	12.6 min	13.1 min	11.0 min	21.2 min
Scheduled departures a day	325	317	323	19,410
Scheduled departures	9,740	9,496	117,896	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
DL Delta Air Lines	4,569	47%	80.3%	0.6 min	1.1%
OO SkyWest Airlines	2,990	31%	89.2%	-6.0 min	0.4%
WN Southwest Airlines	918	9%	78.5%	1.6 min	0.3%
AA American Airlines	414	4%	81.2%	8.0 min	0.7%
UA United Airlines	381	4%	81.1%	1.3 min	0.3%
F9 Frontier Airlines	289	3%	79.6%	-2.3 min	3.1%
AS Alaska Airlines	94	1%	67.0%	8.7 min	1.1%
B6 JetBlue Airways	46	0%	80.4%	-2.7 min	4.3%
HA Hawaiian Airlines	31	0%	61.3%	88.0 min	0.0%
MQ Envoy Air	8	0%	87.5%	2.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SLC–DEN	Salt Lake City to Denver	623	75.4%	4.5 min	0.5%
SLC–PHX	Salt Lake City to Phoenix	514	87.2%	-2.4 min	0.6%
SLC–LAX	Salt Lake City to Los Angeles	358	84.1%	-3.7 min	1.7%
SLC–DFW	Salt Lake City to Dallas/Fort Worth	333	80.5%	11.1 min	1.5%
SLC–LAS	Salt Lake City to Las Vegas	314	76.4%	3.7 min	1.0%
SLC–SEA	Salt Lake City to Seattle	303	70.0%	8.1 min	0.3%
SLC–SFO	Salt Lake City to San Francisco	295	71.5%	14.4 min	1.7%
SLC–SAN	Salt Lake City to San Diego	274	76.6%	5.4 min	0.7%
SLC–ATL	Salt Lake City to Atlanta	252	87.7%	-8.0 min	0.4%
SLC–ORD	Salt Lake City to Chicago	241	68.9%	11.3 min	0.4%
SLC–PDX	Salt Lake City to Portland	201	83.6%	-0.7 min	1.0%
SLC–IAH	Salt Lake City to Houston	184	87.5%	-4.4 min	1.1%

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), December 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	49.9%	33.3%	50,160
Late-arriving aircraft	29.6%	41.1%	29,719
National Aviation System	17.6%	19.1%	17,631
Extreme weather	2.9%	6.4%	2,889
Security	0.0%	0.2%	49

100,448 delay minutes on 1,563 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 December 2025?

80.9% of 9,740 scheduled domestic departures left less than 15 minutes late, and 82.8% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 82.6% of 9,496 departures left on time and 0.3% were cancelled, against 80.9% and 0.8% in December 2025.

Provenance

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