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Flight Reliability

DL 1252 · Delta Air Lines

Salt Lake City → San Diego (SLC–SAN)82% of its flights flew this route. The rest (SAN–SLC, MSP–ATL) are included in these numbers.

92
Nerd Approved
WanderNerd Reliability Score
86%
Arrive within 15 minutes
1 min early
Average arrival delay
0%
Cancelled
6 min early
Median arrival delay

Based on 312 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 1252 departing between 6–9 PM arrived on time 93% of the time, versus 85% between 3–6 PM.

Friday is doing you no favors.

DL 1252 arrived on time 91% of the time on Tuesdays. On Fridays: 81%.

A bit ahead of the Delta Air Lines network.

DL 1252 arrived on time 86% of the time, versus 81% across the Delta Air Lines network.

It basically never cancels.

Out of 312 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon89%(56 flights)
  • Tue91%(53 flights)
  • Wed85%(48 flights)
  • Thu83%(47 flights)
  • Fri81%(48 flights)
  • Sat—(7 flights)
  • Sun88%(51 flights)
On-time by departure window
  • 6–9 AM—(3 flights)
  • 3–6 PM85%(254 flights)
  • 6–9 PM93%(53 flights)
On-time trend by month
80%
May

Jun 83% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%24
July 202570%23
August 202595%20
September 202588%16
October 202581%26
November 202588%24
December 202577%35
January 202682%28
February 2026100%20
March 2026100%22
April 202695%42
May 202680%30
Departures on time
85%
Diverted
0.6%
Flights flown
310
Months covered
12

Same route, other flights

Keep nerding

Based on 312 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.