Chicago to Philadelphia — airline reliability comparison
Southwest Airlines is the most reliable airline on the MDW to PHL route with a 77% on-time rate, compared to Frontier Airlines at 71%. Based on 5,100 flights tracked.
This route involves weather-prone airports, which can affect reliability regardless of airline.
Source: Bureau of Transportation Statistics. Updated October 2026.| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 77% | 1.2% | 52m | 5,100 |
| Frontier AirlinesF9Worst | 71% | 3.2% | 85m | 748 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.