Best Time to Fly SAT to SEA: On-Time Stats by Hour & Airline
San Antonio International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
558 flights were scheduled from San Antonio (SAT) to Seattle (SEA) in the last 12 months, and 78.6% of those that flew arrived on time, 1.0 points above the US average of 77.6%.
Alaska Airlines was the only reporting airline with regular flights on this route.
September has been the best month (87% on time) and Thursday the weakest day of the week (71%).
1.2% of flights were cancelled, versus 1.8% nationally.
SAT 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 | 78.6% | 54 min | 1.2% | 558 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAT to SEA
On-time arrival % by scheduled departure hour (local time), 1,150 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 80.5% | 1.0% | 192 |
| 7am–8am | 85.5% | 0.6% | 333 |
| 3pm–4pm | 70.0% | 0.0% | 61 |
| 4pm–5pm | 70.0% | 0.0% | 50 |
| 5pm–6pm | 81.2% | 0.0% | 64 |
| 6pm–7pm | 72.5% | 1.6% | 193 |
| 7pm–8pm | 61.8% | 0.8% | 257 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAT 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 | 26 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 73.2% | -4.3 pts | 1.8% | 57 |
| Summer peak (Jun 15 - Aug 15) | 70.1% | -7.4 pts | 0.8% | 246 |
| All other days | 77.5% | — | 0.7% | 821 |
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).