Flight number record

DL 1142

Delta Air Lines · Salt Lake City to Los Angeles

Route: SLC → LAX
Departs: 20:45
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1142, check with Delta Air Lines.

DL 1142 lands a B+, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That is a workable record, not a spotless one. That rests on 361 flights, with a median arrival 7 minutes early.

On time

78.6%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

51 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

3.9%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 7 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When DL 1142 flies

DL 1142 flies SLC to LAX without a single fixed slot. Its most common scheduled departure was 20:45, used on 55 of 361 flights, with 20:30 (48 flights) and 21:10 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:4555 flights15.2%
Departs 20:3048 flights13.3%
Departs 21:1038 flights10.5%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 20:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 1142 runs 8 points better at 78.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 1142 next to SLC to LAX

Every carrier on SLC to LAX combined arrived on time 86.2% of the time across 4,146 flights, so DL 1142 is 8 points behind it. Delta flew 2,454 flights on the same city pair under all its flight numbers, including this one, and those ran 85.4% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.

DL 1142 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1142thin sample	361	78.6%	51 min	0.55%	B+
All Delta Air Lines on SLC–LAX	2,454	85.4%	51 min	0.41%	A+
All carriers on SLC–LAX	4,146	86.2%	55 min	0.46%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1142 quarter by quarter

DL 1142 did not run the same all year. Its best quarter was Oct–Dec 2025 at 88.5% on time and its weakest Apr–Jun 2026 at 67.0%, a swing of 22 points on roughly 90 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202591 flights81.3%
Oct–Dec 202589 flights88.5%
Jan–Mar 202690 flights77.8%
Apr–Jun 202691 flights67.0%

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

By weekday, DL 1142 did best on Saturday at 86.5% on time and worst on Monday at 72.5%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1142 runs late

One category carries most of the weight here. Carrier accounts for 51% of the 3,957 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
51%
Late-arriving aircraft
29%
National Airspace System
18%
Extreme weather
3%

The largest share of delay minutes, 51%, 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 2,011 of the 3,957 delay minutes reported here. The split is drawn from 3,957 delay minutes reported on DL 1142.

Cancellations are rare at 0.55%, below the national 1.81% 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.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.9% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 590 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 361 flights under DL 1142 in the data flew SLC to LAX. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 361 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking DL 1142

For a booking, DL 1142 is one of the weaker ways to fly SLC to LAX: 8 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

Where to go next

A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

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