Chicago to Philadelphia — airline reliability comparison
Republic Airways is the most reliable airline on the ORD to PHL route with a 84% on-time rate, compared to Frontier Airlines at 59%. Based on 72 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 |
|---|---|---|---|---|
| Republic AirwaysYXBest | 84% | 1.1% | 44m | 72 |
| United AirlinesUA | 76% | 0.9% | 69m | 5,852 |
| American AirlinesAA | 73% | 2.4% | 104m | 9,726 |
| Frontier AirlinesF9Worst | 59% | 2.8% | 157m | 413 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.