About 1 in 11 DL 3818 flights from Portland arrived 15+ minutes late, diverted or cancelled over the past year (9%); 0.3% were cancelled. The typical flight landed 12 minutes early.
DL 3818: PDX → SEA
Scheduled to leave Portland at 11:10 a.m. local time, operated by SkyWest as OO 3818. Over the past year it arrived on time 91% of the time (318 flights), in line with other DL flights on the route at that hour (91%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 47 | 89% |
| Tuesday | 46 | 98% |
| Wednesday | 46 | 96% |
| Thursday | 45 | 84% |
| Friday | 45 | 82% |
| Saturday | 44 | 86% |
| Sunday | 45 | 98% |
Why it was late
All flights PDX → SEA · Connecting off DL 3818? Check the risk
DL 3818: SEA → PDX
Scheduled to leave Seattle at 9:30 a.m. local time, operated by SkyWest as OO 3818. Over the past year it arrived on time 88% of the time (256 flights), in line with other DL flights on the route at that hour (88%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 84% |
| Tuesday | 36 | 83% |
| Wednesday | 36 | 94% |
| Thursday | 37 | 86% |
| Friday | 37 | 86% |
| Saturday | 36 | 92% |
| Sunday | 37 | 86% |
Why it was late
All flights SEA → PDX · Connecting off DL 3818? Check the risk
Questions
How often is DL 3818 from PDX to SEA late?
Delta Air Lines 3818 from Portland, OR to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 9% of 318 scheduled flights between September 2025 and August 2026. 0.3% were cancelled.
How often is DL 3818 from SEA to PDX late?
Delta Air Lines 3818 from Seattle, WA to Portland, OR arrived 15 or more minutes late, was diverted or was cancelled on 13% of 256 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.