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Flight Reliability

DL 1586 · Delta Air Lines

Salt Lake City → Denver (SLC–DEN)

69
Usually Fine
WanderNerd Reliability Score
66%
Arrive within 15 minutes
20 min
Average arrival delay
0%
Cancelled
2 min early
Median arrival delay

Based on 346 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 1586 departing between 3–6 PM arrived on time 75% of the time, versus 60% between 6–9 PM.

Thursdays have been rough.

DL 1586 arrived on time 77% of the time on Saturdays and just 55% on Thursdays. That gap is worth planning around.

Lagging the SLC–DEN route.

DL 1586 arrived on time 66% of the time, versus 77% across the SLC–DEN route.

Well behind the Delta Air Lines network.

DL 1586 arrived on time 66% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon63%(51 flights)
  • Tue62%(45 flights)
  • Wed71%(44 flights)
  • Thu55%(51 flights)
  • Fri67%(52 flights)
  • Sat77%(52 flights)
  • Sun69%(51 flights)
On-time by departure window
  • 3–6 PM75%(146 flights)
  • 6–9 PM60%(200 flights)
On-time trend by month
90%
May

Jun 37% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202537%30
July 202529%31
August 202548%29
September 202573%26
October 202574%31
November 202584%25
December 202564%25
January 202681%31
February 202674%27
March 202668%31
April 202677%30
May 202690%30
Departures on time
71%
Diverted
0%
Flights flown
346
Months covered
12

Same route, other flights

Keep nerding

Based on 346 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.