Flight Reliability
DL 829 · Delta Air Lines
Salt Lake City → Los Angeles (SLC–LAX)
94
Nerd Approved
WanderNerd Reliability Score
- 88%
- Arrive within 15 minutes
- 0 min
- Average arrival delay
- 0.5%
- Cancelled
- 7 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Saturday is the weak spot.
DL 829 arrived on time 90% of the time on Tuesdays. On Saturdays: 83%.
A bit ahead of the Delta Air Lines network.
DL 829 arrived on time 88% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 829 arrived on time 87% of the time over the last three months in the data, compared with 83% in the three months before that.
The breakdown
- Mon84%(51 flights)
- Tue90%(52 flights)
- Wed90%(52 flights)
- Thu90%(52 flights)
- Fri90%(52 flights)
- Sat83%(52 flights)
- Sun89%(52 flights)
97%
May
Jun 83% → May 97% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 30 |
| July 2025 | 81% | 31 |
| August 2025 | 100% | 31 |
| September 2025 | 93% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 97% | 30 |
| December 2025 | 93% | 30 |
| January 2026 | 81% | 31 |
| February 2026 | 75% | 28 |
| March 2026 | 73% | 30 |
| April 2026 | 90% | 30 |
| May 2026 | 97% | 31 |
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 363
- 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.