Route on-time record
SEA to KOA: most on-time flights and the best time to fly
Seattle (Seattle–Tacoma International Airport) to Kailua-Kona (Ellison Onizuka Kona International Airport at Keāhole). 1,421 nonstop flights in Jun 2025 to May 2026, 71% arrived within 15 minutes and 1.3% were cancelled. The most reliable flight number was Alaska 204 at 2:06 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SEA → KOA
Seattle to Kailua-Kona: 1,421 nonstop flights a year
On time (12 months)
71%
Cancelled
1.3%
avg delay 16 min
Best time to leave
Before 9 AM
84% on time vs 64% 9 AM to noon
Most reliable airline
Delta
76% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Alaska 204
2:06 PM → 5:31 PM6h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 323; its record covers all of them.
79%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 82% of the time (155 flights, Jun 2025 to May 2026).
- Never cancelled in 158 scheduled flights.
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Moderate track record · 155 flights
Find Alaska 204 fares Opens this date on Aviasales#2 · Delta 340
3:25 PM → 6:38 PM6h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 78%
- Cancelled
- 1.6%
- Avg arrival delay
- 13 min
- Arrived on time 78% of the time (358 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 358 flights
Find Delta 340 fares Opens this date on Aviasales#3 · Alaska 238
10:08 AM → 1:39 PM6h 27m nonstop
Local times, typical schedule. Last flown 2026-05-31.
72%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 76% of the time (159 flights, Jun 2025 to May 2026).
- Never cancelled in 164 scheduled flights.
- Leaves in this route's least on-time window (9 AM to noon: 64% on time; Before 9 AM: 84%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Moderate track record · 159 flights
Find Alaska 238 fares Opens this date on Aviasales#4 · Alaska 200
7:03 PM → 10:27 PM6h 24m nonstop
Local times, typical schedule. Last flown 2026-05-31.
69%
chance on time
- On time (history)
- 69%
- Cancelled
- 0.0%
- Avg arrival delay
- 16 min
- Arrived on time 69% of the time (153 flights, Jun 2025 to May 2026).
- Never cancelled in 154 scheduled flights.
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 153 flights
Find Alaska 200 fares Opens this date on Aviasales#5 · Alaska 504
10:00 AM → 1:39 PM6h 39m nonstop
Local times, typical schedule. Last flown 2026-04-21.
66%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (9 AM to noon: 64% on time; Before 9 AM: 84%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find Alaska 504 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines76%
365 flights · 78% on time as flown · 1.5% cancel
- Alaska Airlines68%
1,056 flights · 68% on time as flown · 1.2% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM84%
76 flights · avg delay 8 min
- 9 AM to noon64%
289 flights · avg delay 20 min
- Noon to 3 PM74%
579 flights · avg delay 15 min
- 3 to 6 PM73%
243 flights · avg delay 14 min
- 6 to 9 PM66%
234 flights · avg delay 18 min
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)41%
- Air traffic control and airport volume30%
- Late-arriving aircraft27%
- Severe weather2%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
SEA to KOA questions
- What time of day is best to fly SEA to KOA?
- Before 9 AM: 84% of flights arrived on time, against 64% for departures 9 AM to noon. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SEA to KOA?
- Delta, with a season-adjusted 76% chance of operating and arriving on time over 365 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on SEA to KOA?
- July (69% on time); the best was April (86%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from SEA
- KOA to SEA (return)
- SEA to LAX 83%
- SEA to PHX 79%
- SEA to SFO 69%
- SEA to ANC 74%
- SEA to DEN 77%
- SEA to LAS 77%
- SEA to ORD 75%
- SEA to GEG 81%
- SEA to DFW 77%
- SEA to PDX 82%
- SEA to SAN 78%
- SEA to SMF 81%
Live status: FAA delays and ground stops