Delta Air Lines is the most reliable airline on the SAN to SEA route with a 87% on-time rate, compared to Southwest Airlines at 60%. Based on 6,189 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SAN to SEA
San Diego to Seattle — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines87%
SkyWest Airlines83%
Alaska Airlines80%
Southwest Airlines60%
SAN to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 87% | 0.7% | 88m | 6,189 |
| SkyWest AirlinesOO | 83% | 0.0% | 24m | 12 |
| Alaska AirlinesAS | 80% | 1.6% | 60m | 10,137 |
| Southwest AirlinesWNWorst | 60% | 0.0% | 51m | 149 |
Route Overview
83%
Overall On-Time
67m
Avg Delay
1.2%
Cancel Rate
16,595
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.