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Flight Reliability

DL 2399 · Delta Air Lines

Los Angeles → Detroit (LAX–DTW)100% of its flights flew this route. The rest (JFK–ATL) are included in these numbers.

95
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
4 min early
Average arrival delay
0.4%
Cancelled
9 min early
Median arrival delay

Based on 228 historical flights. Data through May 2026.

What the data says

The 3–6 AM departure wins.

DL 2399 departing between 3–6 AM arrived on time 100% of the time, versus 75% between 9 AM–12 PM.

Sunday scaries are real for this one.

DL 2399 arrived on time 94% of the time on Mondays. On Sundays: 85%.

Better than the LAX–DTW route average.

DL 2399 arrived on time 90% of the time, versus 83% across the LAX–DTW route.

Better than the Delta Air Lines network average.

DL 2399 arrived on time 90% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon94%(32 flights)
  • Tue90%(31 flights)
  • Wed91%(32 flights)
  • Thu91%(32 flights)
  • Fri91%(32 flights)
  • Sat91%(33 flights)
  • Sun85%(34 flights)
On-time by departure window
  • 3–6 AM100%(32 flights)
  • 6–9 AM90%(178 flights)
  • 9 AM–12 PM75%(16 flights)
On-time trend by month
100%
May

Jun 83% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202597%30
December 202583%12
January 202684%31
February 202686%28
March 202690%30
April 202693%30
May 2026100%31
Departures on time
93%
Diverted
0.4%
Flights flown
226
Months covered
9

Same route, other flights

Keep nerding

Based on 228 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.