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Flight Reliability

DL 5123 · Delta Air Lines

New York → Jacksonville (JFK–JAX)94% of its flights flew this route. The rest (ATL–CLT, CLT–ATL) are included in these numbers.

56
A Little Dicey
WanderNerd Reliability Score
74%
Arrive within 15 minutes
13 min
Average arrival delay
6.2%
Cancelled
5 min early
Median arrival delay

Based on 370 historical flights. Data through May 2026.

What the data says

12–3 PM has a slight edge.

Departures between 12–3 PM arrived on time 77% of the time, against 74% between 6–9 PM.

Sunday scaries are real for this one.

DL 5123 arrived on time 78% of the time on Tuesdays. On Sundays: 66%.

A bit behind the JFK–JAX route.

DL 5123 arrived on time 74% of the time, versus 77% across the JFK–JAX route.

Lagging the Delta Air Lines network.

DL 5123 arrived on time 74% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon78%(50 flights)
  • Tue78%(51 flights)
  • Wed75%(48 flights)
  • Thu71%(48 flights)
  • Fri77%(52 flights)
  • Sat73%(48 flights)
  • Sun66%(50 flights)
On-time by departure window
  • 12–3 PM77%(22 flights)
  • 3–6 PM—(3 flights)
  • 6–9 PM74%(322 flights)
On-time trend by month
87%
May

Jun 36% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202536%28
July 202576%21
August 202568%31
September 202580%30
October 202573%30
November 202576%29
December 202562%34
January 202683%29
February 202696%25
March 202673%30
April 202683%30
May 202687%30
Departures on time
75%
Diverted
0%
Flights flown
347
Months covered
12

Same route, other flights

Keep nerding

Based on 370 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.