Flight Reliability
DL 432 · Delta Air Lines
Washington → Salt Lake City (IAD–SLC)
84
Pretty Reliable
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 1.6%
- Cancelled
- 5 min early
- Median arrival delay
Based on 364 historical flights. Data through May 2026.
What the data says
Saturday is the weak spot.
DL 432 arrived on time 88% of the time on Mondays. On Saturdays: 79%.
Trending in the right direction.
DL 432 arrived on time 89% of the time over the last three months in the data, compared with 73% in the three months before that.
The breakdown
- Mon88%(49 flights)
- Tue82%(51 flights)
- Wed87%(52 flights)
- Thu84%(50 flights)
- Fri81%(52 flights)
- Sat79%(52 flights)
- Sun83%(52 flights)
94%
May
Jun 80% → May 94% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 80% | 30 |
| July 2025 | 84% | 31 |
| August 2025 | 94% | 31 |
| September 2025 | 93% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 69% | 29 |
| December 2025 | 70% | 30 |
| January 2026 | 76% | 29 |
| February 2026 | 73% | 26 |
| March 2026 | 83% | 30 |
| April 2026 | 90% | 30 |
| May 2026 | 94% | 31 |
- Departures on time
- 89%
- Diverted
- 0%
- Flights flown
- 358
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 364 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.