Historical on-time performance
Houston to Chicago
Flights on IAH–ORD arrive on time 74% of the time over the last 12 months.
based on 5,569 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.
- United AirlinesOn-time77%Medianon timep9040 minCancel0.7%Flights3,981
- Envoy AirOn-time72%Medianon timep9050 minCancel1.3%Flights303
- Republic AirwaysOn-time68%Medianon timep9075 minCancel2.5%Flights241
- Frontier AirlinesOn-time68%Medianon timep9070 minCancel0.0%Flights31
- Spirit AirlinesOn-time66%Medianon timep9075 minCancel3.3%Flights243
- American AirlinesOn-time65%Medianon timep9095 minCancel3.0%Flights770
Why flights run late
Delay causes
- Airline25%
- Weather6%
- Air traffic (NAS)32%
- Late aircraft37%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline11%
- Weather77%
- Air traffic (NAS)11%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 70 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 IAH → ORD
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 — 87% on time.
- Mornings87% on time · p90 15 min · 5,402 flights
- Middays77% on time · p90 50 min · 3,165 flights
- Overnights70% on time · p90 70 min · 2,423 flights
- Afternoons69% on time · p90 75 min · 2,707 flights
- Evenings63% on time · p90 80 min · 2,625 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 78% on time.
- Wednesdays78% on time · p90 40 min · 2,214 flights
- Tuesdays77% on time · p90 45 min · 2,207 flights
- Saturdays77% on time · p90 50 min · 2,197 flights
- Thursdays76% on time · p90 45 min · 2,409 flights
- Mondays75% on time · p90 65 min · 2,411 flights
- Fridays75% on time · p90 55 min · 2,439 flights
- Sundays72% on time · p90 60 min · 2,446 flights
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