Southwest Airlines is the most reliable airline on the PDX to STL route with a 97% on-time rate, compared to Alaska Airlines at 83%. Based on 53 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: PDX to STL
Portland to St. Louis — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines97%
Alaska Airlines83%
PDX to STL Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 97% | 0.0% | 39m | 53 |
| Alaska AirlinesASWorst | 83% | 1.1% | 25m | 80 |
Route Overview
87%
Overall On-Time
34m
Avg Delay
0.7%
Cancel Rate
149
Total Flights
Flying out of PDX? 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.