Historical on-time performance
Chicago to Buffalo
473 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–BUF arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.6%of scheduled flights
based on 1,911 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Republic AirwaysOn-time79%Medianon timep9025 minCancel1.8%Flights171
- SkyWest AirlinesOn-time60%Medianon timep9075 minCancel9.2%Flights109
- American AirlinesOn-time54%Median10 minp90100 minCancel2.2%Flights274
- United AirlinesOn-time76%Medianon timep9045 minCancel0.5%Flights650
- Envoy AirOn-time79%Medianon timep9030 minCancel1.3%Flights707
Why flights run late
Delay causes
- Airline27%
- Weather9%
- Air traffic (NAS)18%
- Late aircraft47%
- 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 ORD → BUF
All airlines · rolling 36 months (2023-01 .. 2025-12).
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 · 1,162 flights
- Middays79% on time · p90 40 min · 793 flights
- Afternoons79% on time · p90 40 min · 1,454 flights
- Evenings69% on time · p90 60 min · 1,745 flights
- Overnights55% on time · p90 90 min · 503 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 78% on time.
- Tuesdays78% on time · p90 45 min · 795 flights
- Saturdays77% on time · p90 40 min · 727 flights
- Mondays77% on time · p90 40 min · 856 flights
- Thursdays75% on time · p90 45 min · 834 flights
- Wednesdays73% on time · p90 50 min · 801 flights
- Fridays73% on time · p90 55 min · 831 flights
- Sundays71% on time · p90 55 min · 815 flights
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