Boston to Chicago — airline reliability comparison
Spirit Airlines is the most reliable airline on the BOS to ORD route with a 87% on-time rate, compared to Delta Air Lines at 73%. Based on 150 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 |
|---|---|---|---|---|
| Spirit AirlinesNKBest | 87% | 5.7% | 60m | 150 |
| Republic AirwaysYX | 82% | 2.8% | 68m | 2,467 |
| United AirlinesUA | 81% | 1.7% | 77m | 8,576 |
| American AirlinesAA | 79% | 1.8% | 96m | 6,177 |
| MQ | 79% | 2.0% | 103m | 1,698 |
| SkyWest AirlinesOO | 75% | 2.9% | 111m | 461 |
| JetBlue AirwaysB6 | 73% | 1.4% | 71m | 2,005 |
| Delta Air LinesDLWorst | 73% | 2.1% | 76m | 3,365 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.