American Airlines is the most reliable airline on the SEA to PHX route with a 86% on-time rate, compared to Frontier Airlines at 72%. Based on 1,176 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to PHX
Seattle to Phoenix — airline reliability comparison
On-Time Rate by Airline
American Airlines86%
Delta Air Lines85%
84%
SkyWest Airlines84%
Alaska Airlines78%
Southwest Airlines76%
Frontier Airlines72%
SEA to PHX Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| American AirlinesAABest | 86% | 0.5% | 108m | 1,176 |
| Delta Air LinesDL | 85% | 0.5% | 57m | 6,311 |
| MQ | 84% | 0.0% | 81m | 1,440 |
| SkyWest AirlinesOO | 84% | 0.2% | 88m | 1,768 |
| Alaska AirlinesAS | 78% | 0.8% | 43m | 10,662 |
| Southwest AirlinesWN | 76% | 0.4% | 43m | 3,513 |
| Frontier AirlinesF9Worst | 72% | 1.7% | 111m | 869 |
Route Overview
80%
Overall On-Time
56m
Avg Delay
0.6%
Cancel Rate
25,808
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.