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Flight Reliability

DL 3540 · Delta Air Lines

Salt Lake City → SUN (SLC–SUN)87% of its flights flew this route. The rest (DTW–PIT, AGS–ATL) are included in these numbers.

100
Nerd Approved
WanderNerd Reliability Score
96%
Arrive within 15 minutes
14 min early
Average arrival delay
0.4%
Cancelled
16 min early
Median arrival delay

Based on 225 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 3540 departing between 6–9 PM arrived on time 98% of the time, versus 80% between 12–3 PM.

Skip Wednesday if you can.

DL 3540 arrived on time 100% of the time on Mondays. On Wednesdays: 91%.

Better than the Delta Air Lines network average.

DL 3540 arrived on time 96% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon100%(33 flights)
  • Tue94%(33 flights)
  • Wed91%(33 flights)
  • Thu94%(32 flights)
  • Fri100%(32 flights)
  • Sat93%(30 flights)
  • Sun100%(31 flights)
On-time by departure window
  • 12–3 PM80%(30 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM98%(193 flights)
On-time trend by month
100%
Apr

Jun 83% → Apr 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%35
July 2025100%31
August 202597%31
September 2025100%30
October 202597%31
November 202597%29
December 2025100%19
April 2026100%12
Departures on time
96%
Diverted
0%
Flights flown
224
Months covered
9

Same route, other flights

Keep nerding

Based on 225 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.