Flight Reliability
DL 3123 · Delta Air Lines
Salt Lake City → San Antonio (SLC–SAT)
86
Pretty Reliable
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 0 min
- Average arrival delay
- 1.3%
- Cancelled
- 8 min early
- Median arrival delay
Based on 158 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
DL 3123 arrived on time 96% of the time on Mondays and just 74% on Thursdays. That gap is worth planning around.
The breakdown
- Mon96%(22 flights)
- Tue87%(23 flights)
- Wed78%(23 flights)
- Thu74%(23 flights)
- Fri78%(23 flights)
- Sat90%(19 flights)
- Sun83%(23 flights)
84%
May
Dec 92% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| December 2025 | 92% | 12 |
| January 2026 | 81% | 31 |
| February 2026 | 82% | 28 |
| March 2026 | 85% | 27 |
| April 2026 | 82% | 27 |
| May 2026 | 84% | 31 |
- Departures on time
- 83%
- Diverted
- 0%
- Flights flown
- 156
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 158 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.