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Flight Reliability

DL 4317 · Delta Air Lines

Salt Lake City → EKO (SLC–EKO)

100
Nerd Approved
WanderNerd Reliability Score
96%
Arrive within 15 minutes
7 min early
Average arrival delay
0.8%
Cancelled
18 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

Sunday comes out ahead.

A small edge: 100% on time on Sundays against 94% on Fridays.

Well ahead of the Delta Air Lines network.

DL 4317 arrived on time 96% of the time, versus 81% across the Delta Air Lines network.

Slipping a little lately.

DL 4317 arrived on time 93% of the time over the last three months in the data, compared with 96% in the three months before that.

The breakdown

On-time by weekday
  • Mon98%(50 flights)
  • Tue94%(52 flights)
  • Wed96%(52 flights)
  • Thu96%(51 flights)
  • Fri94%(51 flights)
  • Sat96%(52 flights)
  • Sun100%(52 flights)
On-time by departure window
  • 12–3 PM—(2 flights)
  • 3–6 PM94%(16 flights)
  • 9 PM–12 AM97%(342 flights)
On-time trend by month
90%
May

Jun 100% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 2025100%31
August 202597%31
September 202597%30
October 202594%31
November 2025100%30
December 202597%30
January 2026100%29
February 202693%27
March 202697%31
April 202693%29
May 202690%31
Departures on time
95%
Diverted
0.3%
Flights flown
360
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.