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Flight Reliability

DL 3506 · Delta Air Lines

Salt Lake City → Long Beach (SLC–LGB)86% of its flights flew this route. The rest (MFR–SLC, MSP–ORD) are included in these numbers.

98
Nerd Approved
WanderNerd Reliability Score
94%
Arrive within 15 minutes
6 min early
Average arrival delay
0.9%
Cancelled
9 min early
Median arrival delay

Based on 226 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 3506 departing between 6–9 PM arrived on time 95% of the time, versus 84% between 12–3 PM.

Skip Saturday if you can.

DL 3506 arrived on time 100% of the time on Tuesdays. On Saturdays: 87%.

A bit ahead of the SLC–LGB route.

DL 3506 arrived on time 94% of the time, versus 88% across the SLC–LGB route.

Better than the Delta Air Lines network average.

DL 3506 arrived on time 94% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon97%(31 flights)
  • Tue100%(33 flights)
  • Wed94%(31 flights)
  • Thu97%(32 flights)
  • Fri88%(34 flights)
  • Sat87%(31 flights)
  • Sun94%(32 flights)
On-time by departure window
  • 12–3 PM84%(25 flights)
  • 3–6 PM—(3 flights)
  • 6–9 PM95%(196 flights)
On-time trend by month
84%
May

Jun 100% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%23
July 202587%31
August 2025100%31
September 202597%30
October 202594%31
November 202593%30
December 2025100%19
May 202684%25
Departures on time
94%
Diverted
0%
Flights flown
224
Months covered
9

Same route, other flights

Keep nerding

Based on 226 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.