Historical on-time performance
Boston to Chicago
861 miData through Dec 2025Source: US DOT · BTS
Flights on BOS–MDW arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 1,304 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time73%Medianon timep9055 minCancel1.0%Flights1,304
Why flights run late
Delay causes
- Airline22%
- Weather3%
- Air traffic (NAS)17%
- Late aircraft58%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly BOS → MDW
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 54% to 90% on time.
- Mornings90% on time · p90 10 min · 1,471 flights
- Middays88% on time · p90 15 min · 810 flights
- Afternoons64% on time · p90 65 min · 563 flights
- Evenings55% on time · p90 90 min · 739 flights
- Overnights54% on time · p90 85 min · 491 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 80% on time.
- Saturdays80% on time · p90 35 min · 501 flights
- Wednesdays80% on time · p90 30 min · 545 flights
- Tuesdays78% on time · p90 45 min · 550 flights
- Mondays77% on time · p90 50 min · 620 flights
- Sundays72% on time · p90 60 min · 617 flights
- Fridays71% on time · p90 55 min · 621 flights
- Thursdays71% on time · p90 55 min · 620 flights
Advertisement
Keep exploring