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Flight Reliability

DL 1165 · Delta Air Lines

Seattle → Salt Lake City (SEA–SLC)91% of its flights flew this route. The rest (SNA–SEA, SAV–ATL) are included in these numbers.

86
Pretty Reliable
WanderNerd Reliability Score
80%
Arrive within 15 minutes
9 min
Average arrival delay
0.6%
Cancelled
0 min
Median arrival delay

Based on 332 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 1165 departing between 6–9 PM arrived on time 91% of the time, versus 80% between 3–6 PM.

Sunday scaries are real for this one.

DL 1165 arrived on time 86% of the time on Mondays and just 69% on Sundays. That gap is worth planning around.

A bit behind the SEA–SLC route.

DL 1165 arrived on time 80% of the time, versus 84% across the SEA–SLC route.

Ticking up lately.

DL 1165 arrived on time 84% of the time over the last three months in the data, compared with 78% in the three months before that.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue80%(46 flights)
  • Wed78%(46 flights)
  • Thu79%(48 flights)
  • Fri85%(48 flights)
  • Sat84%(43 flights)
  • Sun69%(49 flights)
On-time by departure window
  • 3–6 PM80%(319 flights)
  • 6–9 PM91%(11 flights)
On-time trend by month
87%
May

Jun 80% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%30
July 202565%31
August 202573%30
September 202590%30
October 202581%31
November 202593%29
December 202571%31
January 202690%10
February 202672%18
March 202672%29
April 202693%30
May 202687%31
Departures on time
78%
Diverted
0%
Flights flown
330
Months covered
12

Same route, other flights

Keep nerding

Based on 332 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.