Flight Reliability
DL 4823 · Delta Air Lines
Washington → Detroit (IAD–DTW)95% of its flights flew this route. The rest (JAX–JFK, DTW–LEX) are included in these numbers.
89
Pretty Reliable
WanderNerd Reliability Score
- 86%
- Arrive within 15 minutes
- 9 min
- Average arrival delay
- 1.2%
- Cancelled
- 9 min early
- Median arrival delay
Based on 162 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
DL 4823 arrived on time 91% of the time on Saturdays. On Fridays: 79%.
Better than the IAD–DTW route average.
DL 4823 arrived on time 86% of the time, versus 79% across the IAD–DTW route.
A bit ahead of the Delta Air Lines network.
DL 4823 arrived on time 86% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon83%(23 flights)
- Tue87%(23 flights)
- Wed83%(23 flights)
- Thu87%(23 flights)
- Fri79%(24 flights)
- Sat91%(23 flights)
- Sun91%(21 flights)
- 12–3 PM86%(159 flights)
- 9 PM–12 AM—(1 flights)
84%
Oct
Jun 79% → Oct 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 79% | 28 |
| July 2025 | 81% | 31 |
| August 2025 | 87% | 31 |
| September 2025 | 97% | 30 |
| October 2025 | 84% | 31 |
- Departures on time
- 88%
- Diverted
- 0%
- Flights flown
- 160
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 162 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.