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Flight Reliability

DL 5138 · Delta Air Lines

Detroit → Knoxville (DTW–TYS)95% of its flights flew this route. The rest (ATL–CAE, LGA–JAX) are included in these numbers.

66
Usually Fine
WanderNerd Reliability Score
70%
Arrive within 15 minutes
23 min
Average arrival delay
1.2%
Cancelled
0 min
Median arrival delay

Based on 345 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 5138 departing between 3–6 PM arrived on time 82% of the time, versus 69% between 6–9 PM.

Friday is doing you no favors.

DL 5138 arrived on time 81% of the time on Tuesdays and just 57% on Fridays. That gap is worth planning around.

A bit behind the DTW–TYS route.

DL 5138 arrived on time 70% of the time, versus 74% across the DTW–TYS route.

Lagging the Delta Air Lines network.

DL 5138 arrived on time 70% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon65%(52 flights)
  • Tue81%(52 flights)
  • Wed80%(51 flights)
  • Thu71%(49 flights)
  • Fri57%(51 flights)
  • Sat77%(34 flights)
  • Sun60%(52 flights)
On-time by departure window
  • 3–6 PM82%(17 flights)
  • 6–9 PM69%(309 flights)
  • 9 PM–12 AM80%(15 flights)
On-time trend by month
74%
May

Jun 63% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%24
July 202565%26
August 202573%26
September 202589%26
October 202583%29
November 202568%28
December 202558%31
January 202665%31
February 202664%28
March 202655%31
April 202683%30
May 202674%31
Departures on time
71%
Diverted
0%
Flights flown
341
Months covered
12

Same route, other flights

Keep nerding

Based on 345 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.