Atlanta to Chicago — airline reliability comparison
Delta Air Lines is the most reliable airline on the ATL to MDW route with a 83% on-time rate, compared to Frontier Airlines at 62%. Based on 5,061 flights tracked.
This route involves 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 |
|---|---|---|---|---|
| Delta Air LinesDLBest | 83% | 1.6% | 59m | 5,061 |
| Southwest AirlinesWN | 80% | 1.1% | 57m | 6,117 |
| Frontier AirlinesF9Worst | 62% | 2.7% | 85m | 1,849 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.