Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 1535 · Delta Air Lines

Phoenix → Salt Lake City (PHX–SLC)

100
Nerd Approved
WanderNerd Reliability Score
97%
Arrive within 15 minutes
9 min early
Average arrival delay
0.3%
Cancelled
14 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Skip Thursday if you can.

DL 1535 arrived on time 100% of the time on Tuesdays. On Thursdays: 92%.

Better than the PHX–SLC route average.

DL 1535 arrived on time 97% of the time, versus 84% across the PHX–SLC route.

Well ahead of the Delta Air Lines network.

DL 1535 arrived on time 97% of the time, versus 81% across the Delta Air Lines network.

It basically never cancels.

Out of 365 scheduled flights, only 0.3% were cancelled.

The breakdown

On-time by weekday
  • Mon96%(52 flights)
  • Tue100%(52 flights)
  • Wed100%(52 flights)
  • Thu92%(52 flights)
  • Fri98%(51 flights)
  • Sat94%(52 flights)
  • Sun96%(53 flights)
On-time trend by month
100%
May

Jun 97% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 2025100%30
August 202597%31
September 202593%30
October 202597%31
November 2025100%30
December 202594%31
January 202697%31
February 202696%28
March 202697%31
April 202693%30
May 2026100%31
Departures on time
96%
Diverted
0%
Flights flown
364
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.