Historical on-time performance
Chicago to Buffalo
473 miData through May 2026Source: US DOT · BTS
Flights on ORD–BUF arrive on time 69% of the time over the last 12 months.
On-time rate69%arrived within 15 min
p90 delay70 min1 in 10 flights is worse (tail risk)
Cancelled2.7%of scheduled flights
based on 1,819 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Envoy AirbestOn-time80%Medianon timep9040 minCancel2.4%Flights419
- United AirlinesOn-time73%Medianon timep9065 minCancel1.1%Flights564
- Republic AirwaysOn-time69%Medianon timep9055 minCancel5.1%Flights256
- SkyWest AirlinesOn-time62%Medianon timep9080 minCancel7.9%Flights151
- American AirlinesOn-time58%Medianon timep9090 minCancel2.1%Flights429
Why flights run late
Delay causes
- Airline25%
- Weather7%
- Air traffic (NAS)16%
- Late aircraft51%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline10%
- Weather64%
- Air traffic (NAS)26%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 50 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 ORD → BUF
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 — 84% on time.
- Mornings84% on time · p90 25 min · 1,303 flights
- Afternoons78% on time · p90 40 min · 1,366 flights
- Middays75% on time · p90 55 min · 975 flights
- Evenings67% on time · p90 70 min · 1,753 flights
- Overnights51% on time · p90 105 min · 533 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 77% on time.
- Saturdays77% on time · p90 40 min · 760 flights
- Tuesdays75% on time · p90 55 min · 830 flights
- Thursdays74% on time · p90 50 min · 884 flights
- Mondays74% on time · p90 50 min · 887 flights
- Wednesdays73% on time · p90 50 min · 846 flights
- Fridays71% on time · p90 60 min · 871 flights
- Sundays69% on time · p90 65 min · 854 flights
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