About 1 in 6 DL 3891 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (17%); 0.4% were cancelled. The typical flight landed 8 minutes early.
DL 3891: SEA → PSC
Scheduled to leave Seattle at 1:30 p.m. local time, operated by SkyWest as OO 3891. Over the past year it arrived on time 83% of the time (248 flights), worse than other DL flights on the route at that hour (87%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 95% |
| Tuesday | 36 | 89% |
| Wednesday | 34 | 76% |
| Thursday | 34 | 82% |
| Friday | 36 | 86% |
| Saturday | 35 | 83% |
| Sunday | 36 | 72% |
Why it was late
All flights SEA → PSC · Connecting off DL 3891? Check the risk
Questions
How often is DL 3891 from SEA to PSC late?
Delta Air Lines 3891 from Seattle, WA to Pasco/Kennewick/Richland, WA arrived 15 or more minutes late, was diverted or was cancelled on 17% of 248 scheduled flights between September 2025 and August 2026. 0.4% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.