SEA to PDX flight delays & on-time performance
Nonstop flights from Seattle–Tacoma International Airport to Portland International Airport · 129 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SEA or PDX right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Seattle (SEA) to Portland (PDX) arrived on time 83% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.7% were cancelled, and 4% arrived an hour or more late.
- SkyWest Airlines was the most punctual airline here (86% on time); Delta Air Lines was the least (75%).
- Departures scheduled around 7am did best (94% on time); around 10pm did worst (70%).
- Tuesday was the most reliable day to fly (85% on time) and Thursday the least (79%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (50%).
Which airline is most on time from SEA to PDX?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 86% | 0.5% | 8 min | 3.6% | 3,377 |
| Alaska Airlines | 77% | 1.2% | 11 min | 3.8% | 1,155 |
| Delta Air Lines | 75% | 0.0% | 18 min | 4.6% | 280 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am93%137 flights
- 7am94%400 flights
- 8am86%196 flights
- 9am90%363 flights
- 10am88%174 flights
- 11am82%460 flights
- 12pm79%183 flights
- 1pm88%295 flights
- 2pm92%93 flights
- 3pm78%406 flights
- 4pm82%260 flights
- 5pm85%262 flights
- 6pm80%252 flights
- 7pm83%198 flights
- 8pm79%183 flights
- 9pm83%357 flights
- 10pm70%337 flights
- 11pm75%256 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday84%0.4% cancelled
- Tuesday85%0.3% cancelled
- Wednesday85%0.4% cancelled
- Thursday79%0.4% cancelled
- Friday82%2.1% cancelled
- Saturday84%0.3% cancelled
- Sunday83%0.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)50%
- Late-arriving aircraft22%
- Air traffic control & airport congestion13%
- Extreme weather13%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion47%
- Extreme weather34%
- Airline (crew, maintenance, cleaning, fueling)19%
- Security0%
SEA to PDX: common questions
- How often are SEA to PDX flights on time?
- 83% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Seattle to Portland cancelled?
- 0.7% of scheduled flights were cancelled (32 of 4,812).
- How long are typical delays?
- Across all flights the average arrival delay was 10 min (early arrivals count as zero). Flights that were late arrived 50 min behind schedule on average, and 3.7% of flights were an hour or more late.
- How long is taxi time at SEA?
- Flights on this route spent 24 min taxiing from the gate to takeoff on average.
Related routes
Return trip: PDX to SEA — 85% on time
More flights from Seattle
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SEA → PDX, nonstop flights by US airlines that report to the DOT. How we calculate this.