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Flight Reliability

DL 1854 · Delta Air Lines

San Juan → New York (SJU–JFK)

100
Nerd Approved
WanderNerd Reliability Score
95%
Arrive within 15 minutes
8 min early
Average arrival delay
0.8%
Cancelled
16 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Skip Saturday if you can.

DL 1854 arrived on time 98% of the time on Thursdays. On Saturdays: 90%.

Better than the SJU–JFK route average.

DL 1854 arrived on time 95% of the time, versus 80% across the SJU–JFK route.

Better than the Delta Air Lines network average.

DL 1854 arrived on time 95% of the time, versus 81% across the Delta Air Lines network.

Trending in the right direction.

DL 1854 arrived on time 99% of the time over the last three months in the data, compared with 91% in the three months before that.

The breakdown

On-time by weekday
  • Mon94%(51 flights)
  • Tue92%(52 flights)
  • Wed96%(52 flights)
  • Thu98%(52 flights)
  • Fri98%(52 flights)
  • Sat90%(51 flights)
  • Sun94%(52 flights)
On-time trend by month
100%
May

Jun 97% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202590%31
August 202590%31
September 202593%30
October 202597%31
November 2025100%30
December 2025100%31
January 202679%29
February 202693%27
March 202697%31
April 2026100%30
May 2026100%31
Departures on time
96%
Diverted
0%
Flights flown
362
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.