Alaska Airlines is the most reliable airline on the SEA to CHS route with a 84% on-time rate. Based on 1,249 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to CHS
Seattle to Charleston — airline reliability comparison
On-Time Rate by Airline
Alaska Airlines84%
SEA to CHS Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Alaska AirlinesASBest | 84% | 1.0% | 40m | 1,249 |
Route Overview
84%
Overall On-Time
40m
Avg Delay
0.9%
Cancel Rate
1,249
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.