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Flight Reliability

DL 1440 · Delta Air Lines

Spokane → Salt Lake City (GEG–SLC)

97
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
3 min early
Average arrival delay
0.8%
Cancelled
13 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 95% of the time, against 91% between 3–6 AM.

Saturday is the weak spot.

DL 1440 arrived on time 96% of the time on Tuesdays. On Saturdays: 84%.

Better than the Delta Air Lines network average.

DL 1440 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.

Ticking up lately.

DL 1440 arrived on time 93% of the time over the last three months in the data, compared with 89% in the three months before that.

The breakdown

On-time by weekday
  • Mon92%(52 flights)
  • Tue96%(52 flights)
  • Wed94%(51 flights)
  • Thu94%(52 flights)
  • Fri89%(52 flights)
  • Sat84%(51 flights)
  • Sun94%(52 flights)
On-time by departure window
  • 3–6 AM91%(278 flights)
  • 6–9 AM95%(84 flights)
On-time trend by month
97%
May

Jun 97% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202597%31
August 202584%31
September 202593%30
October 202593%30
November 202593%30
December 202594%31
January 202681%31
February 202693%28
March 202690%29
April 202693%30
May 202697%31
Departures on time
90%
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.