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Flight Reliability

DL 1388 · Delta Air Lines

Raleigh–Durham → Detroit (RDU–DTW)

95
Nerd Approved
WanderNerd Reliability Score
94%
Arrive within 15 minutes
8 min early
Average arrival delay
1.6%
Cancelled
16 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

DL 1388 arrived on time 98% of the time on Tuesdays. On Fridays: 86%.

A bit ahead of the RDU–DTW route.

DL 1388 arrived on time 94% of the time, versus 87% across the RDU–DTW route.

Better than the Delta Air Lines network average.

DL 1388 arrived on time 94% of the time, versus 81% across the Delta Air Lines network.

Ticking up lately.

DL 1388 arrived on time 93% of the time over the last three months in the data, compared with 89% in the three months before that.

The breakdown

On-time by weekday
  • Mon88%(51 flights)
  • Tue98%(52 flights)
  • Wed98%(51 flights)
  • Thu98%(52 flights)
  • Fri86%(51 flights)
  • Sat94%(52 flights)
  • Sun92%(50 flights)
On-time by departure window
  • 3–6 AM94%(335 flights)
  • 6–9 AM92%(24 flights)
On-time trend by month
90%
May

Jun 100% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%28
July 2025100%31
August 202587%31
September 2025100%30
October 202597%31
November 202593%30
December 202574%31
January 202697%29
February 202696%27
March 202697%31
April 202693%30
May 202690%30
Departures on time
94%
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.