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Flight Reliability

DL 917 · Delta Air Lines

New York → Salt Lake City (JFK–SLC)

88
Pretty Reliable
WanderNerd Reliability Score
87%
Arrive within 15 minutes
4 min early
Average arrival delay
1.4%
Cancelled
10 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

Thursday is the weak spot.

DL 917 arrived on time 90% of the time on Wednesdays. On Thursdays: 82%.

Better than the JFK–SLC route average.

DL 917 arrived on time 87% of the time, versus 79% across the JFK–SLC route.

A bit ahead of the Delta Air Lines network.

DL 917 arrived on time 87% of the time, versus 81% across the Delta Air Lines network.

Ticking up lately.

DL 917 arrived on time 89% of the time over the last three months in the data, compared with 82% in the three months before that.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue88%(51 flights)
  • Wed90%(51 flights)
  • Thu82%(51 flights)
  • Fri88%(51 flights)
  • Sat89%(52 flights)
  • Sun85%(52 flights)
On-time by departure window
  • 9 AM–12 PM87%(357 flights)
  • 12–3 PM—(1 flights)
On-time trend by month
87%
May

Jun 93% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202574%31
August 2025100%31
September 202587%30
October 202590%31
November 202583%29
December 202573%30
January 202690%29
February 202684%25
March 202687%31
April 202693%30
May 202687%31
Departures on time
87%
Diverted
0.3%
Flights flown
358
Months covered
12

Same route, other flights

Keep nerding

Based on 364 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.