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Flight Reliability

DL 3929 · Delta Air Lines

Los Angeles → Reno (LAX–RNO)99% of its flights flew this route. The rest (CLE–DTW, DTW–CLE) are included in these numbers.

95
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
2 min early
Average arrival delay
0.3%
Cancelled
11 min early
Median arrival delay

Based on 357 historical flights. Data through May 2026.

What the data says

Sunday scaries are real for this one.

DL 3929 arrived on time 94% of the time on Tuesdays. On Sundays: 82%.

A bit ahead of the Delta Air Lines network.

DL 3929 arrived on time 88% of the time, versus 81% across the Delta Air Lines network.

It basically never cancels.

Out of 357 scheduled flights, only 0.3% were cancelled.

Recent months have been rougher.

DL 3929 arrived on time 84% of the time over the last three months in the data, compared with 94% in the three months before that.

The breakdown

On-time by weekday
  • Mon88%(51 flights)
  • Tue94%(52 flights)
  • Wed90%(52 flights)
  • Thu90%(51 flights)
  • Fri88%(49 flights)
  • Sat84%(50 flights)
  • Sun82%(51 flights)
On-time by departure window
  • 3–6 PM—(2 flights)
  • 6–9 PM89%(182 flights)
  • 9 PM–12 AM88%(172 flights)
On-time trend by month
79%
May

Jun 83% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202583%29
August 202584%31
September 202590%30
October 202597%30
November 202585%27
December 202590%31
January 202697%31
February 202696%27
March 202681%31
April 202693%30
May 202679%29
Departures on time
89%
Diverted
0%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 357 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.