Flight Reliability
DL 3172 · Delta Air Lines
Salt Lake City → Denver (SLC–DEN)97% of its flights flew this route. The rest (SDF–ATL) are included in these numbers.
92
Nerd Approved
WanderNerd Reliability Score
- 86%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 0%
- Cancelled
- 9 min early
- Median arrival delay
Based on 202 historical flights. Data through May 2026.
What the data says
Thursday is the weak spot.
DL 3172 arrived on time 93% of the time on Tuesdays. On Thursdays: 79%.
Better than the SLC–DEN route average.
DL 3172 arrived on time 86% of the time, versus 77% across the SLC–DEN route.
A bit ahead of the Delta Air Lines network.
DL 3172 arrived on time 86% of the time, versus 81% across the Delta Air Lines network.
It basically never cancels.
Out of 202 scheduled flights, only 0.0% were cancelled.
The breakdown
- Mon86%(29 flights)
- Tue93%(29 flights)
- Wed86%(29 flights)
- Thu79%(28 flights)
- Fri79%(29 flights)
- Sat86%(28 flights)
- Sun93%(29 flights)
74%
Dec
Jun 90% → Dec 74% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 90% | 30 |
| July 2025 | 77% | 31 |
| August 2025 | 90% | 31 |
| September 2025 | 100% | 29 |
| October 2025 | 84% | 31 |
| November 2025 | 83% | 30 |
| December 2025 | 74% | 19 |
- Departures on time
- 89%
- Diverted
- 0.5%
- Flights flown
- 201
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 202 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.