Flight Reliability
DL 3229 · Delta Air Lines
Detroit → Salt Lake City (DTW–SLC)88% of its flights flew this route. The rest (RDU–ATL) are included in these numbers.
100
Nerd Approved
WanderNerd Reliability Score
- 92%
- Arrive within 15 minutes
- 4 min early
- Average arrival delay
- 0%
- Cancelled
- 6 min early
- Median arrival delay
Based on 73 historical flights. Data through May 2026.
What the data says
Saturday has been the better bet.
A small edge: 83% on time on Saturdays against 80% on Sundays.
Better than the DTW–SLC route average.
DL 3229 arrived on time 92% of the time, versus 81% across the DTW–SLC route.
Better than the Delta Air Lines network average.
DL 3229 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon—(9 flights)
- Tue—(9 flights)
- Wed—(9 flights)
- Thu—(9 flights)
- Fri—(9 flights)
- Sat83%(18 flights)
- Sun80%(10 flights)
80%
Aug
Jun 91% → Aug 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 91% | 23 |
| July 2025 | 100% | 31 |
| August 2025 | 80% | 10 |
- Departures on time
- 95%
- Diverted
- 0%
- Flights flown
- 73
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 73 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.