Best Time to Fly IND to SEA: On-Time Stats by Hour & Airline
Indianapolis International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 74.8% of Indianapolis (IND) to Seattle (SEA) flights arrived on time (564 scheduled flights). That is 2.8 points below the national average of 77.6%.
Alaska Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (80% on time) and June the worst month (64%).
The cancellation rate was 1.4% (US average 1.8%).
IND 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 | 74.8% | 48 min | 1.4% | 564 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IND to SEA
On-time arrival % by scheduled departure hour (local time), 1,114 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 79.7% | 0.0% | 114 |
| 7am–8am | 81.3% | 1.5% | 337 |
| 8am–9am | Limited data | 28 | |
| 10am–11am | Limited data | 1 | |
| 5pm–6pm | 70.0% | 2.0% | 51 |
| 6pm–7pm | 72.8% | 0.9% | 448 |
| 7pm–8pm | 66.2% | 1.5% | 135 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IND 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) | 69.1% | -8.2 pts | 0.0% | 55 |
| Summer peak (Jun 15 - Aug 15) | 70.1% | -7.2 pts | 0.4% | 246 |
| All other days | 77.3% | — | 1.4% | 787 |
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).