Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 4911 · Delta Air Lines

Raleigh–Durham → Cincinnati (RDU–CVG)90% of its flights flew this route. The rest (RDU–AUS, ATL–TLH) are included in these numbers.

85
Pretty Reliable
WanderNerd Reliability Score
80%
Arrive within 15 minutes
4 min
Average arrival delay
0.6%
Cancelled
9 min early
Median arrival delay

Based on 343 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

DL 4911 departing between 6–9 AM arrived on time 94% of the time, versus 73% between 3–6 PM.

Tuesday is the weak spot.

DL 4911 arrived on time 86% of the time on Fridays. On Tuesdays: 73%.

The breakdown

On-time by weekday
  • Mon78%(51 flights)
  • Tue73%(52 flights)
  • Wed79%(52 flights)
  • Thu83%(52 flights)
  • Fri86%(50 flights)
  • Sat81%(36 flights)
  • Sun79%(48 flights)
On-time by departure window
  • 6–9 AM94%(16 flights)
  • 9 AM–12 PM80%(15 flights)
  • 12–3 PM81%(224 flights)
  • 3–6 PM73%(86 flights)
On-time trend by month
74%
May

Jun 81% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%31
July 202556%32
August 202583%29
September 202592%26
October 202593%27
November 202592%24
December 202579%29
January 202684%25
February 202668%22
March 202682%33
April 202678%32
May 202674%31
Departures on time
78%
Diverted
0%
Flights flown
341
Months covered
12

Keep nerding

Based on 343 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.