Kona (KOA) to Seattle (SEA): On-Time Performance
Data through July 2026
Alaska Airlines effectively owns the KOA–SEA corridor, operating 74% of its flights and landing on time 86% of the time. That concentration hasn't hurt reliability: the route beats the national on-time average by 9 points (87% vs 78%).
- On-time
- 87%
- arrived <15 min late
- Avg delay
- 9 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 3.9
- last 12 months
- Duration
- 5h 55m
- scheduled
- Distance
- 2,688 mi
Best airline from KOA to SEA
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 90% | 6 min | 2.2% | 761 |
| Alaska Airlines | 86% | 10 min | 1.4% | 2,203 |
Monthly on-time trend
Best time to fly from KOA to SEA
Aim for departures around 8 p.m. (93% on-time); avoid 11 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 14 min |
| Tuesdaybest | 90% | 7 min |
| Wednesday | 89% | 7 min |
| Thursday | 88% | 8 min |
| Friday | 87% | 7 min |
| Saturday | 85% | 10 min |
| Sunday | 85% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft39%
- Airline operations38%
- National airspace system21%
- Weather2%
Frequently asked questions
- How often are flights from KOA to SEA delayed?
- 13% of KOA–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 9 minutes.
- Which airline is most reliable from KOA to SEA?
- Delta Air Lines has the best on-time record on this route at 90%, based on 761 flights. 2 airlines flew KOA–SEA frequently enough to compare in this period.
- What is the best time of day to fly from KOA to SEA?
- Departures around 8 p.m. have the best record (93% on-time), while departures around 11 p.m. have the worst (65%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from KOA to SEA?
- The scheduled KOA–SEA flight time averages 5h 55m over 2,688 miles. Actual arrival times vary — flights on this route land 15+ minutes late 13% of the time.
- How often are KOA to SEA flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What day of the week is most reliable for KOA to SEA?
- Tuesday flights have the best record at 90% on-time. Day-of-week differences on this route are modest.
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Based on 2,964 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.