Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 4030 · Delta Air Lines

Palm Springs → Salt Lake City (PSP–SLC)

100
Nerd Approved
WanderNerd Reliability Score
98%
Arrive within 15 minutes
15 min early
Average arrival delay
0%
Cancelled
18 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Monday comes out ahead.

A small edge: 100% on time on Mondays against 94% on Saturdays.

A bit ahead of the PSP–SLC route.

DL 4030 arrived on time 98% of the time, versus 94% across the PSP–SLC route.

Well ahead of the Delta Air Lines network.

DL 4030 arrived on time 98% of the time, versus 81% across the Delta Air Lines network.

It basically never cancels.

Out of 365 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon100%(52 flights)
  • Tue98%(52 flights)
  • Wed100%(52 flights)
  • Thu98%(52 flights)
  • Fri96%(52 flights)
  • Sat94%(52 flights)
  • Sun100%(53 flights)
On-time trend by month
100%
May

Jun 100% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 2025100%31
August 202594%31
September 2025100%30
October 2025100%31
November 2025100%30
December 2025100%31
January 202697%31
February 202689%28
March 2026100%31
April 202697%30
May 2026100%31
Departures on time
98%
Diverted
0%
Flights flown
365
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.