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Flight Reliability

DL 3980 · Delta Air Lines

AZO → Detroit (AZO–DTW)96% of its flights flew this route. The rest (SJC–LAX) are included in these numbers.

78
Usually Fine
WanderNerd Reliability Score
82%
Arrive within 15 minutes
21 min
Average arrival delay
1.6%
Cancelled
9 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

The 3–6 AM departure wins.

DL 3980 departing between 3–6 AM arrived on time 83% of the time, versus 75% between 6–9 AM.

Skip Saturday if you can.

DL 3980 arrived on time 89% of the time on Wednesdays. On Saturdays: 78%.

A bit ahead of the AZO–DTW route.

DL 3980 arrived on time 82% of the time, versus 76% across the AZO–DTW route.

Trending in the right direction.

DL 3980 arrived on time 82% of the time over the last three months in the data, compared with 66% in the three months before that.

The breakdown

On-time by weekday
  • Mon78%(51 flights)
  • Tue81%(52 flights)
  • Wed89%(52 flights)
  • Thu89%(52 flights)
  • Fri80%(51 flights)
  • Sat78%(49 flights)
  • Sun81%(52 flights)
On-time by departure window
  • 3–6 AM83%(319 flights)
  • 6–9 AM75%(24 flights)
  • 3–6 PM81%(16 flights)
On-time trend by month
84%
May

Jun 87% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202590%31
August 202590%31
September 2025100%30
October 202587%31
November 202587%30
December 202563%30
January 202663%30
February 202671%28
March 202675%28
April 202686%29
May 202684%31
Departures on time
84%
Diverted
0%
Flights flown
359
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.