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Flight Reliability

DL 1142 · Delta Air Lines

Salt Lake City → Los Angeles (SLC–LAX)

86
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
1 min
Average arrival delay
0.8%
Cancelled
8 min early
Median arrival delay

Based on 361 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 1142 departing between 3–6 PM arrived on time 92% of the time, versus 76% between 6–9 PM.

Friday is doing you no favors.

DL 1142 arrived on time 88% of the time on Saturdays. On Fridays: 75%.

A bit behind the SLC–LAX route.

DL 1142 arrived on time 81% of the time, versus 87% across the SLC–LAX route.

The breakdown

On-time by weekday
  • Mon77%(51 flights)
  • Tue85%(52 flights)
  • Wed77%(52 flights)
  • Thu86%(50 flights)
  • Fri75%(51 flights)
  • Sat88%(51 flights)
  • Sun78%(51 flights)
On-time by departure window
  • 3–6 PM92%(13 flights)
  • 6–9 PM76%(249 flights)
  • 9 PM–12 AM91%(96 flights)
On-time trend by month
68%
May

Jun 83% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%29
July 202581%31
August 202584%31
September 202579%29
October 202594%31
November 202586%29
December 202585%27
January 202671%31
February 202675%28
March 202690%31
April 202673%30
May 202668%31
Departures on time
76%
Diverted
0%
Flights flown
358
Months covered
12

Same route, other flights

Keep nerding

Based on 361 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.