Historical on-time performance
Chicago to Buffalo
468 miData through May 2026Source: US DOT · BTS
Flights on MDW–BUF arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.3%of scheduled flights
based on 830 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time74%Medianon timep9040 minCancel1.3%Flights830
Why flights run late
Delay causes
- Airline40%
- Weather4%
- Air traffic (NAS)12%
- Late aircraft44%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline9%
- Weather82%
- Air traffic (NAS)9%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 11 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 MDW → BUF
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 54% to 86% on time.
- Mornings86% on time · p90 20 min · 570 flights
- Middays83% on time · p90 25 min · 647 flights
- Afternoons66% on time · p90 50 min · 246 flights
- Evenings66% on time · p90 50 min · 648 flights
- Overnights54% on time · p90 70 min · 301 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 79% on time.
- Wednesdays79% on time · p90 25 min · 369 flights
- Tuesdays79% on time · p90 30 min · 370 flights
- Saturdays74% on time · p90 45 min · 210 flights
- Thursdays72% on time · p90 40 min · 385 flights
- Fridays72% on time · p90 55 min · 387 flights
- Mondays71% on time · p90 50 min · 381 flights
- Sundays69% on time · p90 45 min · 310 flights
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