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Flight Reliability

DL 4237 · Delta Air Lines

SGU → Salt Lake City (SGU–SLC)

100
Nerd Approved
WanderNerd Reliability Score
95%
Arrive within 15 minutes
4 min early
Average arrival delay
0%
Cancelled
11 min early
Median arrival delay

Based on 288 historical flights. Data through May 2026.

What the data says

Saturdays have been rough.

DL 4237 arrived on time 100% of the time on Mondays and just 83% on Saturdays. That gap is worth planning around.

Better than the Delta Air Lines network average.

DL 4237 arrived on time 95% of the time, versus 81% across the Delta Air Lines network.

It basically never cancels.

Out of 288 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon100%(41 flights)
  • Tue98%(41 flights)
  • Wed100%(41 flights)
  • Thu98%(41 flights)
  • Fri93%(41 flights)
  • Sat83%(41 flights)
  • Sun93%(42 flights)
On-time by departure window
  • 6–9 AM96%(137 flights)
  • 9 AM–12 PM94%(151 flights)
On-time trend by month
94%
May

Jun 93% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202597%31
August 202594%31
September 202597%30
October 202594%31
November 202597%30
February 202691%11
March 202694%31
April 202697%30
May 202694%31
Departures on time
95%
Diverted
0%
Flights flown
288
Months covered
11

Same route, other flights

Keep nerding

Based on 288 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.