Flight Reliability
DL 4311 · Delta Air Lines
EKO → Salt Lake City (EKO–SLC)
100
Nerd Approved
WanderNerd Reliability Score
- 97%
- Arrive within 15 minutes
- 18 min early
- Average arrival delay
- 0.8%
- Cancelled
- 21 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Saturday is the weak spot.
DL 4311 arrived on time 100% of the time on Mondays. On Saturdays: 90%.
Well ahead of the Delta Air Lines network.
DL 4311 arrived on time 97% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon100%(51 flights)
- Tue96%(50 flights)
- Wed98%(52 flights)
- Thu100%(52 flights)
- Fri96%(52 flights)
- Sat90%(52 flights)
- Sun100%(53 flights)
94%
May
Jun 100% → May 94% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 100% | 30 |
| July 2025 | 97% | 31 |
| August 2025 | 100% | 31 |
| September 2025 | 100% | 30 |
| October 2025 | 100% | 31 |
| November 2025 | 97% | 30 |
| December 2025 | 100% | 31 |
| January 2026 | 93% | 30 |
| February 2026 | 96% | 27 |
| March 2026 | 100% | 31 |
| April 2026 | 90% | 29 |
| May 2026 | 94% | 31 |
- Departures on time
- 98%
- Diverted
- 0%
- Flights flown
- 362
- 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.