Delta Air Lines is the most reliable airline on the SEA to KOA route with a 82% on-time rate, compared to Alaska Airlines at 78%. Based on 1,285 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to KOA
Seattle to Kona — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines82%
Alaska Airlines78%
SEA to KOA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 82% | 0.7% | 60m | 1,285 |
| Alaska AirlinesASWorst | 78% | 1.2% | 44m | 3,787 |
Route Overview
78%
Overall On-Time
48m
Avg Delay
1%
Cancel Rate
5,072
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.