Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 1667 · Delta Air Lines

Salt Lake City → Denver (SLC–DEN)92% of its flights flew this route. The rest (MSP–BZN) are included in these numbers.

81
Pretty Reliable
WanderNerd Reliability Score
74%
Arrive within 15 minutes
9 min
Average arrival delay
0%
Cancelled
5 min early
Median arrival delay

Based on 286 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 1667 departing between 9 PM–12 AM arrived on time 82% of the time, versus 70% between 6–9 PM.

Sunday scaries are real for this one.

DL 1667 arrived on time 84% of the time on Mondays and just 65% on Sundays. That gap is worth planning around.

A bit behind the SLC–DEN route.

DL 1667 arrived on time 74% of the time, versus 77% across the SLC–DEN route.

A bit behind the Delta Air Lines network.

DL 1667 arrived on time 74% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon84%(45 flights)
  • Tue74%(43 flights)
  • Wed71%(45 flights)
  • Thu76%(45 flights)
  • Fri77%(47 flights)
  • Sat73%(11 flights)
  • Sun65%(49 flights)
On-time by departure window
  • 3–6 PM—(5 flights)
  • 6–9 PM70%(177 flights)
  • 9 PM–12 AM82%(103 flights)
On-time trend by month
87%
May

Jun 54% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%24
July 202544%23
August 202573%26
September 202577%22
October 202568%22
November 202591%23
December 202580%25
January 202673%11
February 202676%25
March 202682%28
April 202681%26
May 202687%30
Departures on time
72%
Diverted
0.3%
Flights flown
285
Months covered
12

Same route, other flights

Keep nerding

Based on 286 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.