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Flight Reliability

DL 1582 · Delta Air Lines

Salt Lake City → Sacramento (SLC–SMF)92% of its flights flew this route. The rest (ATL–FLL, FLL–ATL) are included in these numbers.

88
Pretty Reliable
WanderNerd Reliability Score
87%
Arrive within 15 minutes
3 min early
Average arrival delay
1.6%
Cancelled
8 min early
Median arrival delay

Based on 381 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 1582 departing between 9 PM–12 AM arrived on time 90% of the time, versus 43% between 12–3 PM.

Skip Saturday if you can.

DL 1582 arrived on time 94% of the time on Tuesdays. On Saturdays: 80%.

A bit ahead of the Delta Air Lines network.

DL 1582 arrived on time 87% of the time, versus 81% across the Delta Air Lines network.

Trending in the right direction.

DL 1582 arrived on time 89% of the time over the last three months in the data, compared with 81% in the three months before that.

The breakdown

On-time by weekday
  • Mon88%(51 flights)
  • Tue94%(54 flights)
  • Wed82%(54 flights)
  • Thu89%(54 flights)
  • Fri85%(54 flights)
  • Sat80%(55 flights)
  • Sun89%(53 flights)
On-time by departure window
  • 9 AM–12 PM43%(14 flights)
  • 12–3 PM43%(14 flights)
  • 3–6 PM—(1 flights)
  • 9 PM–12 AM90%(346 flights)
On-time trend by month
94%
May

Jun 90% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202587%31
August 202587%31
September 202593%30
October 202584%31
November 202597%29
December 202564%39
January 202689%35
February 202689%28
March 202683%30
April 202690%30
May 202694%31
Departures on time
84%
Diverted
0%
Flights flown
375
Months covered
12

Same route, other flights

Keep nerding

Based on 381 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.