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Flight Reliability

DL 1639 · Delta Air Lines

Charlotte → Detroit (CLT–DTW)94% of its flights flew this route. The rest (MSY–LGA, DTW–CLT) are included in these numbers.

92
Nerd Approved
WanderNerd Reliability Score
91%
Arrive within 15 minutes
4 min early
Average arrival delay
1.3%
Cancelled
17 min early
Median arrival delay

Based on 303 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

DL 1639 departing between 12–3 PM arrived on time 96% of the time, versus 55% between 6–9 PM.

Tuesday is the weak spot.

DL 1639 arrived on time 96% of the time on Thursdays. On Tuesdays: 85%.

Better than the CLT–DTW route average.

DL 1639 arrived on time 91% of the time, versus 82% across the CLT–DTW route.

Better than the Delta Air Lines network average.

DL 1639 arrived on time 91% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon89%(46 flights)
  • Tue85%(48 flights)
  • Wed87%(46 flights)
  • Thu96%(44 flights)
  • Fri93%(45 flights)
  • Sat92%(24 flights)
  • Sun93%(45 flights)
On-time by departure window
  • 6–9 AM—(7 flights)
  • 9 AM–12 PM92%(256 flights)
  • 12–3 PM96%(24 flights)
  • 6–9 PM55%(11 flights)
On-time trend by month
96%
Apr

Jun 93% → Apr 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%29
July 202586%29
August 202593%29
September 202596%25
October 202593%27
November 202592%24
December 202571%24
January 202696%27
February 202696%26
March 202686%28
April 202696%25
Departures on time
89%
Diverted
0.3%
Flights flown
298
Months covered
12

Same route, other flights

Keep nerding

Based on 303 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.