Portland to Chicago — airline reliability comparison
United Airlines is the most reliable airline on the PDX to ORD route with a 86% on-time rate, compared to Spirit Airlines at 51%. Based on 4,799 flights tracked.
This route involves weather-prone airports and high-congestion airports, which can affect reliability regardless of airline.
Source: Bureau of Transportation Statistics. Updated October 2026.| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 86% | 1.0% | 77m | 4,799 |
| Alaska AirlinesAS | 83% | 1.8% | 42m | 1,767 |
| American AirlinesAA | 77% | 1.2% | 105m | 1,706 |
| Spirit AirlinesNKWorst | 51% | 4.3% | 129m | 104 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.