Flight number record
DL 1142
Delta Air Lines · Salt Lake City to Los Angeles
- Route
- SLC → LAX
- Departs
- 20:45
- Flights
- 360
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1142, check with Delta Air Lines.
DL 1142 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 360 flights, with a median arrival 4 minutes early.
Key figures
On time
73.7%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.89%
1 hour+ late
7.3%
National rate is 8.3%
These figures cover 360 flights between September 2025 and August 2026. The median arrival is 4 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.
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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 360 flights, with 20:30 (49 flights) and 21:10 (38 flights) next.
- Departs 20:4555 flights15.3%
- Departs 20:3049 flights13.6%
- Departs 21:1038 flights10.6%
Scale runs 0% to 100%.
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 70.1%, and DL 1142 runs 4 points better at 73.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 1142 next to SLC to LAX
Every carrier on SLC to LAX combined arrived on time 85.6% of the time across 4,196 flights, so DL 1142 is 12 points behind it. Delta flew 2,459 flights on the same city pair under all its flight numbers, including this one, and those ran 83.5% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1142thin sample | 360 | 73.7% | 58 min | 0.56% | C+ |
| All Delta Air Lines on SLC–LAX | 2,459 | 83.5% | 52 min | 0.53% | B+ |
| All carriers on SLC–LAX | 4,196 | 85.6% | 55 min | 0.48% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 Jul–Sep 2026 at 54.1%, a swing of 34 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 202529 flights—
- Oct–Dec 202589 flights88.5%
- Jan–Mar 202690 flights77.8%
- Apr–Jun 202691 flights67.0%
- Jul–Sep 202661 flights54.1%
Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1142 did best on Saturday at 82.7% on time and worst on Monday at 60.8%. Each day rests on about 51 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1142 runs when it is late
DL 1142 often beats the schedule: 113 of 358 completed flights, 32%, arrived 15 minutes or more early. The 94 late arrivals split 40 under half an hour, 28 between 30 and 60 minutes, and 26 an hour or more.
- 15+ min early113 flights31.6%
- Within 15 min151 flights42.2%
- 15–29 min late40 flights11.2%
- 30–59 min late28 flights7.8%
- 1–2 hours late16 flights4.5%
- 2+ hours late10 flights2.8%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
27 of 101 late departures made up the time and arrived on time, 27% of them. In the other direction, 20 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAX.
The worst days
Worst days for DL 1142
The latest arrival of the period was on 18 February 2026, 13 hours 53 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 February 2026 | 13 hours 53 minutes | Carrier |
| 29 July 2026 | 3 hours 52 minutes | Late-arriving aircraft |
| 6 July 2026 | 3 hours 5 minutes | Late-arriving aircraft |
| 19 September 2025 | 2 hours 29 minutes | Late-arriving aircraft |
| 18 October 2025 | 2 hours 19 minutes | Late-arriving aircraft |
Delay causes
Why DL 1142 runs late
Carrier accounts for 46% of the 5,407 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 34%Late-arriving aircraft
- 18%National Airspace System
- 2%Extreme weather
34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,407 reported delay minutes here, that single category outweighs weather by 21 to one. The split is drawn from 5,407 delay minutes reported on DL 1142.
Cancellations are rare at 0.56%, below the national 1.89% 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
7.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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.
Every one of the 360 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. 360 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: 12 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.
Related
Where to go next
- SLC to LAX, every carrier and departure
- LAX to SLC, the return direction
- Delta Air Lines 829 on the same route86.5%
- Delta Air Lines 841 on the same route78.1%
- Delta Air Lines 1087 on the same route91.1%
- Delta Air Lines 1095 on the same route91.1%
- Delta Air Lines 1161 on the same route81.4%
- Salt Lake City International (SLC) delay statistics
- Los Angeles International (LAX) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.