KOA to SEA flight delays & on-time performance
Nonstop flights from Ellison Onizuka Kona International Airport at Keāhole to Seattle–Tacoma International Airport · 2,688 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at KOA or SEA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Kona (KOA) to Seattle (SEA) arrived on time 87% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 2.2% were cancelled, and 3% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (91% on time); Alaska Airlines was the least (86%).
- Departures scheduled around 9am did best (92% on time); around 11am did worst (80%).
- Tuesday was the most reliable day to fly (90% on time) and Monday the least (85%).
- The largest source of delay minutes was late-arriving aircraft (39%).
Which airline is most on time from KOA to SEA?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 91% | 3.0% | 5 min | 2.5% | 365 |
| Alaska Airlines | 86% | 1.9% | 9 min | 3.4% | 1,057 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am90%272 flights
- 9am92%51 flights
- 10am88%58 flights
- 11am80%174 flights
- 12pm68%28 flights
- 1pm87%104 flights
- 8pm91%206 flights
- 9pm90%418 flights
- 10pm89%74 flights
- 11pm46%26 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday85%2.0% cancelled
- Tuesday90%2.0% cancelled
- Wednesday89%1.0% cancelled
- Thursday88%1.0% cancelled
- Friday88%3.4% cancelled
- Saturday85%2.9% cancelled
- Sunday85%2.9% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft39%
- Air traffic control & airport congestion30%
- Airline (crew, maintenance, cleaning, fueling)30%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)71%
- Extreme weather29%
- Air traffic control & airport congestion0%
- Security0%
KOA to SEA: common questions
- How often are KOA to SEA flights on time?
- 87% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Kona to Seattle cancelled?
- 2.2% of scheduled flights were cancelled (31 of 1,422).
- How long are typical delays?
- Across all flights the average arrival delay was 8 min (early arrivals count as zero). Flights that were late arrived 55 min behind schedule on average, and 3.2% of flights were an hour or more late.
- How long is taxi time at KOA?
- Flights on this route spent 16 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SEA to KOA — 74% on time
More flights from Kona
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: KOA → SEA, nonstop flights by US airlines that report to the DOT. How we calculate this.