Flight Reliability
DL 3891 · Delta Air Lines
Seattle → PSC (SEA–PSC)89% of its flights flew this route. The rest (PSC–SEA, DTW–MSN) are included in these numbers.
91
Nerd Approved
WanderNerd Reliability Score
- 85%
- Arrive within 15 minutes
- 0 min
- Average arrival delay
- 0.5%
- Cancelled
- 10 min early
- Median arrival delay
Based on 183 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 3891 arrived on time 100% of the time on Mondays and just 72% on Sundays. That gap is worth planning around.
A bit ahead of the Delta Air Lines network.
DL 3891 arrived on time 85% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon100%(28 flights)
- Tue89%(26 flights)
- Wed73%(22 flights)
- Thu77%(22 flights)
- Fri92%(25 flights)
- Sat90%(30 flights)
- Sun72%(29 flights)
- 3–6 PM85%(181 flights)
- 6–9 PM—(1 flights)
81%
May
Dec 83% → May 81% on time
| Month | On-time percentage | Flights |
|---|---|---|
| December 2025 | 83% | 18 |
| January 2026 | 90% | 30 |
| February 2026 | 84% | 31 |
| March 2026 | 81% | 31 |
| April 2026 | 90% | 30 |
| May 2026 | 81% | 31 |
- Departures on time
- 85%
- Diverted
- 0%
- Flights flown
- 182
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 183 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.