Best Time to Fly KOA to SEA: On-Time Stats by Hour & Airline
Ellison Onizuka Kona International at Keahole → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 87.1% of Kona (KOA) to Seattle (SEA) flights arrived on time (1,422 scheduled flights). That is 9.5 points above the national average of 77.6%.
Among 2 airlines, Delta Air Lines led with 90.7% on time and Alaska Airlines was last with 85.9%.
Over 24 months, Tuesday was the most reliable day (89% on time) and January the worst month (82%).
The cancellation rate was 2.2% (US average 1.8%).
KOA 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 |
|---|---|---|---|---|
| Delta Air Lines | 90.7% | 44 min | 3.0% | 365 |
| Alaska Airlines | 85.9% | 58 min | 1.9% | 1,057 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly KOA to SEA
On-time arrival % by scheduled departure hour (local time), 2,840 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 10 | |
| 8am–9am | 89.1% | 3.1% | 417 |
| 9am–10am | 92.2% | 2.8% | 145 |
| 10am–11am | 88.6% | 1.0% | 204 |
| 11am–12pm | 79.8% | 0.6% | 174 |
| 12pm–1pm | 70.7% | 1.3% | 76 |
| 1pm–2pm | 78.5% | 0.0% | 228 |
| 2pm–3pm | 85.3% | 0.0% | 34 |
| 3pm–4pm | 76.7% | 0.0% | 73 |
| 5pm–6pm | Limited data | 28 | |
| 8pm–9pm | 92.1% | 2.3% | 350 |
| 9pm–10pm | 89.9% | 1.7% | 869 |
| 10pm–11pm | 90.3% | 1.5% | 136 |
| 11pm–12am | 65.3% | 1.0% | 96 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on KOA 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) | 82.3% | -4.0 pts | 1.9% | 52 |
| Christmas & New Year (Dec 20 - Jan 3) | 77.6% | -8.8 pts | 3.3% | 120 |
| Summer peak (Jun 15 - Aug 15) | 90.1% | +3.8 pts | 1.8% | 494 |
| All other days | 86.3% | — | 1.5% | 2,174 |
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).