Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 5231 · Delta Air Lines

Detroit → Rochester (DTW–ROC)96% of its flights flew this route. The rest (DTW–SDF, DTW–RIC) are included in these numbers.

72
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
14 min
Average arrival delay
2.5%
Cancelled
6 min early
Median arrival delay

Based on 275 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 5231 departing between 3–6 PM arrived on time 91% of the time, versus 76% between 9 PM–12 AM.

Sunday scaries are real for this one.

DL 5231 arrived on time 85% of the time on Saturdays and just 69% on Sundays. That gap is worth planning around.

A bit behind the Delta Air Lines network.

DL 5231 arrived on time 76% of the time, versus 81% across the Delta Air Lines network.

Recent months have been rougher.

DL 5231 arrived on time 70% of the time over the last three months in the data, compared with 86% in the three months before that.

The breakdown

On-time by weekday
  • Mon76%(37 flights)
  • Tue73%(41 flights)
  • Wed73%(40 flights)
  • Thu78%(36 flights)
  • Fri79%(34 flights)
  • Sat85%(41 flights)
  • Sun69%(39 flights)
On-time by departure window
  • 3–6 PM91%(11 flights)
  • 9 PM–12 AM76%(257 flights)
On-time trend by month
78%
May

Jun 68% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%28
July 202558%31
August 202590%31
September 202593%30
October 202594%31
November 202571%28
December 202553%30
April 202678%18
May 202678%27
Departures on time
77%
Diverted
0%
Flights flown
268
Months covered
11

Same route, other flights

Keep nerding

Based on 275 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.