Delta Air Lines is the most reliable airline on the PHX to SEA route with a 91% on-time rate, compared to Southwest Airlines at 73%. Based on 6,311 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: PHX to SEA
Phoenix to Seattle — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines91%
85%
American Airlines85%
Alaska Airlines84%
SkyWest Airlines83%
Frontier Airlines81%
Southwest Airlines73%
PHX to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 91% | 0.6% | 93m | 6,311 |
| MQ | 85% | 0.0% | 47m | 1,441 |
| American AirlinesAA | 85% | 0.3% | 76m | 1,177 |
| Alaska AirlinesAS | 84% | 0.9% | 52m | 10,659 |
| SkyWest AirlinesOO | 83% | 0.4% | 64m | 1,767 |
| Frontier AirlinesF9 | 81% | 0.2% | 63m | 869 |
| Southwest AirlinesWNWorst | 73% | 0.2% | 44m | 3,482 |
Route Overview
84%
Overall On-Time
58m
Avg Delay
0.6%
Cancel Rate
25,775
Total Flights
Flying out of PHX? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.