BOS (Boston) to ORD (Chicago) flights arrive on time 78% of the time. The most reliable airline on this route is Spirit Airlines at 87%. The average delay is 80 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated April 2026.BOS → ORD
BOS (Boston) to ORD (Chicago)
BOS → ORD on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is on time most of the time. About 78% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Spirit Airlines edges out Delta Air Lines on this route — 87% vs 73% on time.
Airline Comparison
Spirit Airlines leads at 87% on time; Delta Air Lines trails at 73%.
Accurate?
Good to know
Departing from BOS
79% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. BOS has long runway queues.
TSA is currently ~21 min. Best time: 4 AM (about 5 min).
Arriving at ORD
80% on timeWhen flights into ORD are late, the average delay is 76 minutes. Build buffer if you have ground plans.
If connecting at ORD: TSA is ~21 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated April 2026. Source: Bureau of Transportation Statistics.