Best Time to Fly PIT to SEA: On-Time Stats by Hour & Airline
Pittsburgh International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
470 flights were scheduled from Pittsburgh (PIT) to Seattle (SEA) in the last 12 months, and 73.8% of those that flew arrived on time, 3.9 points below the US average of 77.6%.
Alaska Airlines was the only reporting airline with regular flights on this route.
November has been the best month (94% on time) and Thursday the weakest day of the week (68%).
1.1% of flights were cancelled, versus 1.8% nationally.
PIT 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 |
|---|---|---|---|---|
| Alaska Airlines | 73.8% | 52 min | 1.1% | 470 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PIT to SEA
On-time arrival % by scheduled departure hour (local time), 937 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 89.3% | 2.8% | 144 |
| 8am–9am | 77.1% | 1.5% | 133 |
| 9am–10am | 89.2% | 2.4% | 85 |
| 3pm–4pm | Limited data | 1 | |
| 6pm–7pm | 73.7% | 2.1% | 140 |
| 7pm–8pm | 65.9% | 0.9% | 434 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PIT 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) | Limited data | 13 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 30 | ||
| Summer peak (Jun 15 - Aug 15) | 66.5% | -11.1 pts | 1.6% | 247 |
| All other days | 77.7% | — | 1.6% | 647 |
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).