Best Time to Fly SEA to KOA: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Ellison Onizuka Kona International at Keahole
Data through July 2026 · Last updated October 18, 2026
1,421 flights were scheduled from Seattle (SEA) to Kona (KOA) in the last 12 months, and 74.3% of those that flew arrived on time, 3.3 points below the US average of 77.6%.
Among 2 airlines, Delta Air Lines led with 78.2% on time and Alaska Airlines was last with 73.0%.
Over 24 months, Wednesday was the most reliable day (78% on time) and July the worst month (66%).
The cancellation rate was 1.2% (US average 1.8%).
SEA to KOA 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 | 78.2% | 49 min | 1.9% | 365 |
| Alaska Airlines | 73.0% | 50 min | 0.9% | 1,056 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to KOA
On-time arrival % by scheduled departure hour (local time), 2,840 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 1 | |
| 7am–8am | 78.8% | 0.0% | 33 |
| 8am–9am | 86.6% | 0.0% | 202 |
| 9am–10am | 75.6% | 0.0% | 169 |
| 10am–11am | 64.0% | 0.4% | 245 |
| 11am–12pm | 70.9% | 0.0% | 165 |
| 12pm–1pm | 70.8% | 0.2% | 423 |
| 1pm–2pm | 82.8% | 0.4% | 226 |
| 2pm–3pm | 81.1% | 0.6% | 514 |
| 3pm–4pm | 75.7% | 3.1% | 191 |
| 4pm–5pm | Limited data | 25 | |
| 5pm–6pm | 71.8% | 1.6% | 186 |
| 6pm–7pm | 74.5% | 1.6% | 387 |
| 7pm–8pm | 81.9% | 1.4% | 73 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to KOA
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) | 79.2% | +1.9 pts | 0.0% | 53 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.5% | +1.1 pts | 1.7% | 120 |
| Summer peak (Jun 15 - Aug 15) | 68.8% | -8.5 pts | 1.0% | 494 |
| All other days | 77.4% | — | 0.7% | 2,173 |
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).