Airport month record

SLCJUL

Salt Lake City International in July 2025

Departures: 10,346
Month: July 2025
National, same month: 71.1%
Carriers: 11

Historical statistics for July 2025, not live status or a forecast for this year’s July. For today’s conditions at SLC, see live FAA status.

SLC in July lands a B+, 8 points better than the national rate of 71.1%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 10,346 flights, of which SkyWest Airlines flew 3,235 at 89.9% on time.

SkyWest Airlines is the most reliable of the five carriers covered here at 89.9% on time across 3,235 flights.

On time

79.5%

Arrivals under 15 minutes late, of 10,226 completed departures

Avg delay

69 min

Across delayed arrivals only, not all flights

Cancelled

0.67%

Nationally in July: 2.45%

Whole year

84.8%

SLC across all twelve months

These figures cover 10,346 departures from Salt Lake City International in July 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.

Against the year

July next to SLC's other months

Against SLC's own year, July ran 5 points worse than the twelve-month rate of 84.8%, which makes it the worst of the twelve months in the data.

SLC month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025 (this page)	10,346	79.5%	69 min	0.67%	B+
August 2025	9,985	84.3%	62 min	0.39%	B+
September 2025	9,344	88.2%	62 min	0.19%	A+
October 2025	9,841	85.7%	60 min	0.11%	A+
November 2025	9,197	86.5%	71 min	1.72%	A
December 2025	9,740	83.8%	64 min	0.84%	B+
January 2026	9,515	85.5%	66 min	1.79%	A
February 2026	9,167	85.5%	73 min	0.99%	A+
March 2026	10,632	85.8%	67 min	1.21%	A
April 2026	9,877	84.4%	60 min	0.38%	B+
May 2026	10,146	85.3%	57 min	0.42%	A+
June 2026	10,084	83.3%	64 min	0.48%	B+

Departure window

The best time of day to leave SLC in July

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against 25 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am771 flights89.4%
8am–11am2,061 flights87.7%
11am–2pm2,011 flights81.2%
2pm–5pm1,736 flights77.4%
5pm–8pm1,403 flights66.9%
8pm–5am2,364 flights76.6%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 89.4% of the time, against 66.9% for the evening window. That is 23 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 2,364 flights scheduled in it.

Across the week, Saturday is the strongest day at 85.6% on time and Thursday the weakest at 77.6%. 8 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at SLC in July

The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 89.9% of the time; United Airlines manages 65.1%. Sample sizes sit next to every figure, because a two-point gap across 388 flights means less than a ten-point one.

Carriers at SLC in July 2025
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	4,779	77.5%	64 min	0.48%	B+
SkyWest Airlines	3,235	89.9%	56 min	0.15%	A+
Southwest Airlines	1,026	70.9%	66 min	0.78%	C+
American Airlines	406	69.2%	115 min	3.69%	C−
United Airlines	388	65.1%	72 min	0.52%	C+
Frontier Airlinesthin sample	212	66.7%	119 min	3.77%	C−
Alaska Airlinesthin sample	130	61.4%	45 min	2.31%	D
JetBlue Airwaysthin sample	62	65.5%	154 min	6.45%	C−
Spirit Airlinesthin sample	43	69.8%	102 min	0.00%	C+
Envoy Airthin sample	34	75.8%	51 min	2.94%	B
Hawaiian Airlinesthin sample	31	87.1%	107 min	0.00%	A+

American Airlines cancels 3.7% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.

Route by route

Busiest routes out of SLC in July

Routes from SLC in July 2025
Route	Flights	On time	Avg delay	Cancelled	Grade
SLC to DEN · Denver	688	63.5%	77 min	1.02%	D
SLC to PHX · Phoenix	431	79.3%	97 min	1.16%	B
SLC to SEA · Seattle	394	74.1%	54 min	1.02%	C
SLC to DFW · Dallas-Fort Worththin sample	330	69.6%	93 min	3.33%	C−
SLC to SFO · San Franciscothin sample	314	76.6%	60 min	0.64%	B+
SLC to LAS · Las Vegasthin sample	299	72.1%	74 min	0.33%	C+
SLC to LAX · Los Angelesthin sample	291	79.5%	52 min	0.69%	B+
SLC to ORD · Chicagothin sample	269	65.7%	105 min	0.37%	C+
SLC to ATL · Atlantathin sample	249	81.4%	45 min	0.40%	B+
SLC to PDX · Portlandthin sample	247	79.7%	81 min	0.40%	B+
SLC to SAN · San Diegothin sample	221	82.7%	51 min	0.00%	B+
SLC to SMF · Sacramentothin sample	204	84.8%	68 min	0.00%	B+
SLC to SJC · San Josethin sample	176	86.9%	80 min	0.00%	A+
SLC to AUS · Austinthin sample	169	64.7%	66 min	0.59%	D+
SLC to DTW · Detroitthin sample	166	84.1%	73 min	0.60%	B+
SLC to JFK · New Yorkthin sample	155	65.8%	104 min	3.23%	C−
SLC to IAH · Houstonthin sample	154	70.7%	78 min	0.65%	C+
SLC to BOI · Boisethin sample	150	86.0%	59 min	0.00%	A+
SLC to OAK · Oaklandthin sample	150	90.0%	46 min	0.00%	A+
SLC to MSP · Minneapolisthin sample	148	75.0%	61 min	0.00%	B+
SLC to SNA · Santa Anathin sample	147	85.0%	38 min	0.00%	A+
SLC to GEG · Spokanethin sample	146	83.6%	51 min	0.00%	B+
SLC to MCO · Orlandothin sample	144	68.1%	50 min	0.69%	C+
SLC to BUR · Burbankthin sample	134	74.6%	36 min	0.00%	C+
SLC to SGU · St. Georgethin sample	134	87.3%	49 min	0.00%	A+

Delay causes

What held SLC up in July

One category carries most of the weight here. Carrier accounts for 48% of the 145,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
48%
Late-arriving aircraft
30%
National Airspace System
19%
Extreme weather
4%

The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 69,000 of the 145,000 delay minutes reported here. The split is drawn from 144,928 reported delay minutes.

Cancellations are rare at 0.67%, below the national 2.45% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

6.7% of arrivals land an hour or more late, close to the national 12.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.

What to do with this

Flying from SLC in July

For a July trip through SLC: plan on this being one of the airport's harder months. The 5am–8am departures held up best at 89.4% on time, and with 6.7% of arrivals an hour or more late, a connection here deserves more slack than the same trip in September would.

Salt Lake City International (SLC), the whole year
SLC in August84.3%
SLC in September88.2%
SLC in October85.7%
SLC in November86.5%
SLC in December83.8%
SLC in January85.5%
SLC in February85.5%
SLC in March85.8%
SLC in April84.4%
SLC in May85.3%
SLC in June83.3%

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures