Carrier route record
ASKOA→SEA
Alaska Airlines · Kailua-Kona to Seattle
- Flights
- 1,047
- Period
- September 2025 to August 2026
- Share of route
- 74%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on KOA to SEA earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 1,047 flights, with a median arrival 11 minutes early.
Set against the rest of the country, Alaska's KOA to SEA record is 9 points better than the US average of 77.3%. That gap is worth roughly 85 fewer late arrivals for every thousand flights.
Key figures
On time
85.8%
Arrivals under 15 minutes late, of 1,027 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.91%
National rate is 1.89%
Whole route
86.7%
Every carrier on KOA to SEA, 1,412 flights
These figures cover 1,047 flights between September 2025 and August 2026. The median arrival is 11 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Alaska against every carrier on KOA to SEA
Alaska flew 1,047 of the 1,412 flights on KOA to SEA, most of the route. Its 85.8% on time is about level with the route as a whole at 86.7%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 89.5% to Alaska at 85.8%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 365 | 89.5% | 47 min | 3.29% | A− |
| Alaska Airlines (this page) | 1,047 | 85.8% | 58 min | 1.91% | A |
Flight by flight
Alaska flight numbers on KOA to SEA
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Departure window
When Alaska runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,047 flights.
- 5am–8am10 flights—
- 8am–11am349 flights89.6%
- 11am–2pm325 flights81.4%
- 2pm–5pm1 flights—
- 5pm–8pm—
- 8pm–5am362 flights86.5%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 81.4% on time against 89.6% for 8am–11am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 362 flights scheduled in it.
Across the year
Alaska on KOA to SEA through the year
April is the best month on the calendar at 92.6% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. January was the busiest month here, with 93 flights.
Across the week, Wednesday is the strongest day at 90.4% on time and Monday the weakest at 80.9%, a spread of 10 points.
Arrival by arrival
How late Alaska on KOA to SEA runs when it is late
Alaska on KOA to SEA often beats the schedule: 432 of 1,027 completed flights, 42%, arrived 15 minutes or more early. Most of the lateness is short. 77 of the 146 late arrivals were under half an hour behind, and 36 reached an hour or more.
- 15+ min early432 flights42.1%
- Within 15 min449 flights43.7%
- 15–29 min late77 flights7.5%
- 30–59 min late33 flights3.2%
- 1–2 hours late16 flights1.6%
- 2+ hours late20 flights1.9%
Scale runs 0% to 100%.
Share of 1,027 completed flights by arrival against schedule.
A late pushback is often recovered here: of 144 departures that left 15 minutes late or more, 63 still arrived on time. In the other direction, 65 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for Alaska on KOA to SEA
The latest arrival of the period was on 4 November 2025, 9 hours 37 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 November 2025 | 9 hours 37 minutes | Late-arriving aircraft |
| 8 December 2025 | 9 hours 28 minutes | Carrier |
| 30 October 2025 | 7 hours 24 minutes | National Airspace System |
| 13 February 2026 | 3 hours 55 minutes | Late-arriving aircraft |
| 21 February 2026 | 3 hours 41 minutes | Late-arriving aircraft |
Delay causes
Why Alaska runs late on this route
Late-arriving aircraft accounts for 43% of the 8,509 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 31%National Airspace System
- 25%Carrier
- 1%Extreme weather
- 0%Security
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,509 reported delay minutes here, that single category outweighs weather by 43 to one. The split is drawn from 8,509 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 89.6% on time here.
Cancellations sit at 1.91% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.5% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 2,688 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg is a different operation and performs like one: it runs 73.9% on time across 1,045 flights, 12 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 12 points of difference.
One caution: this is a thin sample. 1,047 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Alaska on KOA to SEA
Put together: treat all of this as provisional. 1,047 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 85.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,027 completed flights over 12 months sit behind that.
Related
Where to go next
- KOA to SEA, every carrier
- Alaska on SEA to KOA, the return leg
- Delta Air Lines on KOA to SEA89.5%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.