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Flight Reliability

DL 2039 · Delta Air Lines

Chicago → Detroit (ORD–DTW)96% of its flights flew this route. The rest (DFW–LGA) are included in these numbers.

80
Pretty Reliable
WanderNerd Reliability Score
86%
Arrive within 15 minutes
8 min
Average arrival delay
3.6%
Cancelled
10 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

DL 2039 departing between 6–9 AM arrived on time 87% of the time, versus 67% between 12–3 PM.

Sunday scaries are real for this one.

DL 2039 arrived on time 98% of the time on Wednesdays and just 77% on Sundays. That gap is worth planning around.

Better than the ORD–DTW route average.

DL 2039 arrived on time 86% of the time, versus 72% across the ORD–DTW route.

A bit ahead of the Delta Air Lines network.

DL 2039 arrived on time 86% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon78%(50 flights)
  • Tue88%(51 flights)
  • Wed98%(50 flights)
  • Thu90%(51 flights)
  • Fri86%(49 flights)
  • Sat86%(49 flights)
  • Sun77%(52 flights)
On-time by departure window
  • 6–9 AM87%(338 flights)
  • 9 AM–12 PM—(2 flights)
  • 12–3 PM67%(12 flights)
On-time trend by month
93%
May

Jun 86% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%29
July 202577%31
August 202590%30
September 202587%30
October 202597%31
November 202576%29
December 202575%28
January 202679%29
February 202693%28
March 202679%29
April 2026100%29
May 202693%29
Departures on time
87%
Diverted
0%
Flights flown
352
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.