Historical on-time performance
Buffalo to Chicago
468 miData through May 2026Source: US DOT · BTS
Flights on BUF–MDW arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 829 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time77%Medianon timep9040 minCancel1.2%Flights829
Why flights run late
Delay causes
- Airline21%
- Weather0%
- Air traffic (NAS)28%
- Late aircraft50%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline30%
- Weather70%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 10 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly BUF → MDW
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 90% on time.
- Mornings90% on time · p90 10 min · 1,011 flights
- Middays82% on time · p90 25 min · 299 flights
- Evenings77% on time · p90 40 min · 498 flights
- Afternoons74% on time · p90 45 min · 227 flights
- Overnights61% on time · p90 65 min · 354 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 87% on time.
- Tuesdays87% on time · p90 20 min · 360 flights
- Wednesdays85% on time · p90 25 min · 360 flights
- Mondays80% on time · p90 30 min · 377 flights
- Thursdays78% on time · p90 30 min · 385 flights
- Fridays78% on time · p90 40 min · 386 flights
- Saturdays77% on time · p90 30 min · 216 flights
- Sundays74% on time · p90 40 min · 305 flights
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