PSC to SEA flight delays & on-time performance
Nonstop flights from Tri Cities Airport to Seattle–Tacoma International Airport · 172 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at PSC or SEA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Pasco/Kennewick/Richland (PSC) to Seattle (SEA) arrived on time 88% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.9% were cancelled, and 4% arrived an hour or more late.
- SkyWest Airlines was the most punctual airline here (89% on time); Alaska Airlines was the least (85%).
- Departures scheduled around 5am did best (93% on time); around 12pm did worst (84%).
- Monday was the most reliable day to fly (91% on time) and Friday the least (85%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (53%).
Which airline is most on time from PSC to SEA?
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. | 89% | 0.7% | 10 min | 3.7% | 1,482 |
| Alaska Airlines | 85% | 1.6% | 14 min | 6.2% | 245 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am93%272 flights
- 6am91%200 flights
- 8am90%179 flights
- 11am86%35 flights
- 12pm84%149 flights
- 1pm87%344 flights
- 3pm88%108 flights
- 4pm86%21 flights
- 5pm89%307 flights
- 6pm91%32 flights
- 7pm77%44 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday91%0.4% cancelled
- Tuesday91%0.4% cancelled
- Wednesday90%0.4% cancelled
- Thursday87%0.8% cancelled
- Friday85%2.7% cancelled
- Saturday89%1.3% cancelled
- Sunday86%0.0% 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)53%
- Late-arriving aircraft21%
- Extreme weather18%
- Air traffic control & airport congestion8%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion53%
- Extreme weather27%
- Airline (crew, maintenance, cleaning, fueling)20%
- Security0%
PSC to SEA: common questions
- How often are PSC to SEA flights on time?
- 88% 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 Pasco/Kennewick/Richland to Seattle cancelled?
- 0.9% of scheduled flights were cancelled (15 of 1,727).
- How long are typical delays?
- Across all flights the average arrival delay was 11 min (early arrivals count as zero). Flights that were late arrived 84 min behind schedule on average, and 4.0% of flights were an hour or more late.
- How long is taxi time at PSC?
- Flights on this route spent 19 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SEA to PSC — 84% on time
More flights from Pasco/Kennewick/Richland
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: PSC → SEA, nonstop flights by US airlines that report to the DOT. How we calculate this.