Seattle (SEA) to Kona (KOA): On-Time Performance
Data through July 2026
Seattle (SEA) to Kona (KOA) effectively runs on two schedules. In April 2026, 94% of arrivals were on time; in July 2025 that fell to 57% — a 37-point seasonal swing. Across the full period the route averages 76% on-time against a national 78%.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 3.9
- last 12 months
- Duration
- 6h 20m
- scheduled
- Distance
- 2,688 mi
Best airline from SEA to KOA
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 80% | 13 min | 1.2% | 761 |
| Alaska Airlines | 74% | 13 min | 0.6% | 2,203 |
Monthly on-time trend
Best time to fly from SEA to KOA
Aim for departures around 8 a.m. (87% on-time); avoid 10 a.m. departures (64%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 12 min |
| Tuesday | 77% | 11 min |
| Wednesdaybest | 78% | 12 min |
| Thursday | 75% | 13 min |
| Friday | 72% | 17 min |
| Saturday | 75% | 14 min |
| Sunday | 76% | 13 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft28%
- Airline operations45%
- National airspace system25%
- Weather2%
Frequently asked questions
- How often are flights from SEA to KOA delayed?
- 24% of SEA–KOA 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 13 minutes.
- Which airline is most reliable from SEA to KOA?
- Delta Air Lines has the best on-time record on this route at 80%, based on 761 flights. 2 airlines flew SEA–KOA frequently enough to compare in this period.
- What is the best time of day to fly from SEA to KOA?
- Departures around 8 a.m. have the best record (87% on-time), while departures around 10 a.m. have the worst (64%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to KOA?
- The scheduled SEA–KOA flight time averages 6h 20m over 2,688 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are SEA to KOA flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to KOA?
- July 2025 was the roughest month in this dataset, with only 57% of arrivals on time. The best was April 2026 at 94%. If your dates are flexible, that 37-point gap is worth planning around.
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Based on 2,964 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.