Delta Air Lines is the most reliable airline on the SJC to SEA route with a 94% on-time rate, compared to Southwest Airlines at 79%. Based on 322 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SJC to SEA
San Jose to Seattle — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines94%
SkyWest Airlines90%
Alaska Airlines85%
Southwest Airlines79%
SJC to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 94% | 2.9% | 142m | 322 |
| SkyWest AirlinesOO | 90% | 0.1% | 72m | 5,002 |
| Alaska AirlinesAS | 85% | 1.7% | 53m | 6,948 |
| Southwest AirlinesWNWorst | 79% | 0.1% | 48m | 4,118 |
Route Overview
85%
Overall On-Time
56m
Avg Delay
0.8%
Cancel Rate
16,404
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.