Best Time to Fly SEA to PDX: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Portland International
Data through July 2026 · Last updated October 18, 2026
4,812 flights were scheduled from Seattle (SEA) to Portland (PDX) in the last 12 months, and 83.1% of those that flew arrived on time, 5.5 points above the US average of 77.6%.
SkyWest Airlines was the most punctual of the 3 airlines on the route at 86.0%, while Delta Air Lines trailed at 75.4%.
April has been the best month (88% on time) and Thursday the weakest day of the week (79%).
0.7% of flights were cancelled, versus 1.8% nationally.
SEA to PDX on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlines | 86.0% | 53 min | 0.5% | 3,377 |
| Alaska Airlines | 76.8% | 40 min | 1.2% | 1,155 |
| Delta Air Lines | 75.4% | 69 min | 0.0% | 280 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to PDX
On-time arrival % by scheduled departure hour (local time), 9,691 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 92.8% | 1.0% | 209 |
| 6am–7am | 96.0% | 0.0% | 126 |
| 7am–8am | 92.5% | 0.3% | 659 |
| 8am–9am | 86.7% | 0.3% | 377 |
| 9am–10am | 88.5% | 0.3% | 603 |
| 10am–11am | 87.4% | 0.4% | 239 |
| 11am–12pm | 77.7% | 0.8% | 948 |
| 12pm–1pm | 81.5% | 0.7% | 404 |
| 1pm–2pm | 88.1% | 0.0% | 555 |
| 2pm–3pm | 91.9% | 0.8% | 124 |
| 3pm–4pm | 77.3% | 0.4% | 718 |
| 4pm–5pm | 81.2% | 0.0% | 543 |
| 5pm–6pm | 81.8% | 1.1% | 718 |
| 6pm–7pm | 76.9% | 0.8% | 476 |
| 7pm–8pm | 83.5% | 0.2% | 637 |
| 8pm–9pm | 78.9% | 0.8% | 392 |
| 9pm–10pm | 81.6% | 0.3% | 649 |
| 10pm–11pm | 70.2% | 0.3% | 910 |
| 11pm–12am | 72.2% | 1.2% | 404 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to PDX
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 83.8% | +0.8 pts | 0.6% | 180 |
| Christmas & New Year (Dec 20 - Jan 3) | 79.3% | -3.7 pts | 0.3% | 334 |
| Summer peak (Jun 15 - Aug 15) | 76.1% | -6.9 pts | 0.1% | 1,654 |
| All other days | 83.0% | — | 0.6% | 7,523 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).