Seattle (SEA) to Portland (PDX): On-Time Performance
Data through July 2026
When you fly SEA to PDX matters as much as anything else about the booking: the route swung from 91% on-time in April 2026 to just 72% in July 2024. Across the full period the route averages 81% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 77%), which matters most in the rough months.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 13
- last 12 months
- Duration
- 1h 2m
- scheduled
- Distance
- 129 mi
Best airline from SEA to PDX
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 85% | 9 min | 0.4% | 6,701 |
| Delta Air Lines | 78% | 14 min | 0.3% | 704 |
| Alaska Airlines | 73% | 12 min | 0.8% | 2,723 |
Monthly on-time trend
Best time to fly from SEA to PDX
Aim for departures around 6 a.m. (95% on-time); avoid 10 p.m. departures (68%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 11 min |
| Tuesdaybest | 86% | 7 min |
| Wednesday | 83% | 9 min |
| Thursday | 79% | 11 min |
| Friday | 80% | 11 min |
| Saturday | 81% | 12 min |
| Sunday | 80% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft25%
- Airline operations48%
- National airspace system15%
- Weather12%
- Security1%
Frequently asked questions
- How often are flights from SEA to PDX delayed?
- 19% of SEA–PDX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 10 minutes.
- Which airline is most reliable from SEA to PDX?
- SkyWest Airlines has the best on-time record on this route at 85%, based on 6,701 flights. 3 airlines flew SEA–PDX frequently enough to compare in this period.
- What is the best time of day to fly from SEA to PDX?
- Departures around 6 a.m. have the best record (95% on-time), while departures around 10 p.m. have the worst (68%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to PDX?
- The scheduled SEA–PDX flight time averages 1h 2m over 129 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are SEA to PDX flights cancelled?
- 0.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to PDX?
- July 2024 was the roughest month in this dataset, with only 72% of arrivals on time. The best was April 2026 at 91%. If your dates are flexible, that 19-point gap is worth planning around.
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Based on 10,128 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.