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Flight Reliability

DL 863 · Delta Air Lines

New York → Salt Lake City (JFK–SLC)95% of its flights flew this route. The rest (OGG–SLC) are included in these numbers.

69
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
9 min
Average arrival delay
2.0%
Cancelled
5 min early
Median arrival delay

Based on 346 historical flights. Data through May 2026.

What the data says

Thursdays have been rough.

DL 863 arrived on time 80% of the time on Mondays and just 65% on Thursdays. That gap is worth planning around.

Lagging the JFK–SLC route.

DL 863 arrived on time 72% of the time, versus 79% across the JFK–SLC route.

Lagging the Delta Air Lines network.

DL 863 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.

Slipping a little lately.

DL 863 arrived on time 73% of the time over the last three months in the data, compared with 79% in the three months before that.

The breakdown

On-time by weekday
  • Mon80%(46 flights)
  • Tue74%(49 flights)
  • Wed67%(49 flights)
  • Thu65%(48 flights)
  • Fri69%(48 flights)
  • Sat78%(49 flights)
  • Sun69%(48 flights)
On-time trend by month
71%
May

Jun 50% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%28
July 202555%29
August 202581%31
September 202583%30
October 202571%31
November 202579%28
December 2025100%13
January 202660%30
February 202677%26
March 202673%30
April 202673%30
May 202671%31
Departures on time
75%
Diverted
0.6%
Flights flown
337
Months covered
12

Same route, other flights

Keep nerding

Based on 346 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.