Flight Reliability
DL 2173 · Delta Air Lines
Boise → Salt Lake City (BOI–SLC)
96
Nerd Approved
WanderNerd Reliability Score
- 92%
- Arrive within 15 minutes
- 3 min
- Average arrival delay
- 1.1%
- Cancelled
- 7 min early
- Median arrival delay
Based on 362 historical flights. Data through May 2026.
What the data says
Wednesday comes out ahead.
A small edge: 94% on time on Wednesdays against 88% on Mondays.
Better than the Delta Air Lines network average.
DL 2173 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 2173 arrived on time 91% of the time over the last three months in the data, compared with 86% in the three months before that.
The breakdown
- Mon88%(50 flights)
- Tue90%(49 flights)
- Wed94%(52 flights)
- Thu94%(51 flights)
- Fri94%(51 flights)
- Sat92%(52 flights)
- Sun91%(53 flights)
- 3–6 AM91%(155 flights)
- 6–9 AM93%(203 flights)
97%
May
Jun 97% → May 97% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 97% | 30 |
| July 2025 | 100% | 31 |
| August 2025 | 100% | 31 |
| September 2025 | 97% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 89% | 28 |
| December 2025 | 90% | 30 |
| January 2026 | 74% | 31 |
| February 2026 | 92% | 26 |
| March 2026 | 90% | 30 |
| April 2026 | 86% | 29 |
| May 2026 | 97% | 31 |
- Departures on time
- 96%
- Diverted
- 0%
- Flights flown
- 358
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 362 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.