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Flight Reliability

DL 4235 · Delta Air Lines

SGU → Salt Lake City (SGU–SLC)

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

Based on 365 historical flights. Data through May 2026.

What the data says

Wednesday has been the better bet.

A small edge: 100% on time on Wednesdays against 96% on Fridays.

A bit ahead of the SGU–SLC route.

DL 4235 arrived on time 98% of the time, versus 94% across the SGU–SLC route.

Well ahead of the Delta Air Lines network.

DL 4235 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
  • Mon98%(52 flights)
  • Tue96%(52 flights)
  • Wed100%(52 flights)
  • Thu98%(52 flights)
  • Fri96%(52 flights)
  • Sat98%(52 flights)
  • Sun98%(53 flights)
On-time by departure window
  • 3–6 AM98%(114 flights)
  • 6–9 AM98%(250 flights)
  • 9 AM–12 PM—(1 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%31
August 202597%31
September 202597%30
October 2025100%31
November 202597%30
December 2025100%31
January 202690%31
February 2026100%28
March 202697%31
April 2026100%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.