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Flight Reliability

DL 3958 · Delta Air Lines

Salt Lake City → PSC (SLC–PSC)80% of its flights flew this route. The rest (PSC–SLC, SMF–LAX) are included in these numbers.

100
Nerd Approved
WanderNerd Reliability Score
93%
Arrive within 15 minutes
7 min early
Average arrival delay
0.2%
Cancelled
12 min early
Median arrival delay

Based on 401 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 93% of the time, against 87% between 6–9 PM.

Friday is doing you no favors.

DL 3958 arrived on time 100% of the time on Tuesdays and just 84% on Fridays. That gap is worth planning around.

A bit ahead of the SLC–PSC route.

DL 3958 arrived on time 93% of the time, versus 90% across the SLC–PSC route.

Better than the Delta Air Lines network average.

DL 3958 arrived on time 93% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon97%(57 flights)
  • Tue100%(57 flights)
  • Wed91%(57 flights)
  • Thu90%(58 flights)
  • Fri84%(57 flights)
  • Sat93%(54 flights)
  • Sun95%(60 flights)
On-time by departure window
  • 9 AM–12 PM93%(303 flights)
  • 12–3 PM92%(66 flights)
  • 6–9 PM87%(31 flights)
On-time trend by month
93%
May

Jun 100% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 202587%31
August 202597%31
September 202597%30
October 202597%31
November 202597%29
December 202591%43
January 202691%35
February 202686%28
March 202682%28
April 202696%28
May 202693%56
Departures on time
92%
Diverted
0%
Flights flown
400
Months covered
12

Same route, other flights

Keep nerding

Based on 401 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.