About 1 in 6 DL 4017 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (18%); 0.3% were cancelled. The typical flight landed 8 minutes early.
DL 4017: SEA → PSC
Scheduled to leave Seattle at 10:50 p.m. local time, operated by SkyWest as OO 4017. Over the past year it arrived on time 82% of the time (364 flights), better than other DL flights on the route at that hour (76%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Seattle to Pasco (100% of days). Delta Air Lines's last SEA–PSC flight was cancelled 0.3% of the time, against 0.3% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 10:35 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 83% |
| Tuesday | 52 | 92% |
| Wednesday | 52 | 75% |
| Thursday | 52 | 79% |
| Friday | 52 | 71% |
| Saturday | 51 | 92% |
| Sunday | 52 | 81% |
Why it was late
All flights SEA → PSC · Connecting off DL 4017? Check the risk
Questions
How often is DL 4017 from SEA to PSC late?
Delta Air Lines 4017 from Seattle, WA to Pasco/Kennewick/Richland, WA arrived 15 or more minutes late, was diverted or was cancelled on 18% of 364 scheduled flights between September 2025 and August 2026. 0.3% 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.