Best Time to Fly PSC to SEA: On-Time Stats by Hour & Airline
Tri Cities → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 88.4% of Pasco/Kennewick/Richland (PSC) to Seattle (SEA) flights arrived on time (1,727 scheduled flights). That is 10.8 points above the national average of 77.6%.
Among 2 airlines, SkyWest Airlines led with 89.0% on time and Alaska Airlines was last with 85.1%.
Over 24 months, Tuesday was the most reliable day (90% on time) and February the worst month (83%).
The cancellation rate was 0.9% (US average 1.8%).
PSC to SEA 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 | 89.0% | 84 min | 0.7% | 1,482 |
| Alaska Airlines | 85.1% | 87 min | 1.6% | 245 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PSC to SEA
On-time arrival % by scheduled departure hour (local time), 3,652 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.8% | 0.3% | 655 |
| 6am–7am | 92.3% | 0.0% | 300 |
| 8am–9am | 84.0% | 1.3% | 456 |
| 9am–10am | 72.9% | 0.0% | 48 |
| 10am–11am | 65.6% | 0.0% | 32 |
| 11am–12pm | 87.9% | 0.0% | 456 |
| 12pm–1pm | 79.1% | 0.6% | 164 |
| 1pm–2pm | 85.5% | 1.7% | 520 |
| 2pm–3pm | Limited data | 10 | |
| 3pm–4pm | 85.3% | 0.0% | 136 |
| 4pm–5pm | Limited data | 21 | |
| 5pm–6pm | 88.0% | 0.1% | 736 |
| 6pm–7pm | 73.6% | 0.0% | 72 |
| 7pm–8pm | 75.6% | 2.2% | 46 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PSC to SEA
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) | 88.5% | +1.0 pts | 0.0% | 87 |
| Christmas & New Year (Dec 20 - Jan 3) | 86.0% | -1.5 pts | 0.0% | 186 |
| Summer peak (Jun 15 - Aug 15) | 87.1% | -0.4 pts | 0.3% | 600 |
| All other days | 87.5% | — | 0.7% | 2,779 |
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).