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Flight Reliability

DL 1879 · Delta Air Lines

San Juan → Atlanta (SJU–ATL)98% of its flights flew this route. The rest (TPA–CVG) are included in these numbers.

98
Nerd Approved
WanderNerd Reliability Score
95%
Arrive within 15 minutes
8 min early
Average arrival delay
1.4%
Cancelled
10 min early
Median arrival delay

Based on 207 historical flights. Data through May 2026.

What the data says

Saturday is the weak spot.

DL 1879 arrived on time 100% of the time on Wednesdays. On Saturdays: 91%.

Better than the SJU–ATL route average.

DL 1879 arrived on time 95% of the time, versus 82% across the SJU–ATL route.

Better than the Delta Air Lines network average.

DL 1879 arrived on time 95% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon94%(31 flights)
  • Tue92%(26 flights)
  • Wed100%(25 flights)
  • Thu96%(27 flights)
  • Fri100%(30 flights)
  • Sat91%(33 flights)
  • Sun94%(32 flights)
On-time by departure window
  • 6–9 AM96%(199 flights)
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM—(4 flights)
On-time trend by month
97%
May

Jun 93% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202594%31
December 202591%11
January 202694%16
February 2026100%17
March 202697%31
April 202697%30
May 202697%30
Departures on time
93%
Diverted
0%
Flights flown
204
Months covered
11

Same route, other flights

Keep nerding

Based on 207 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.