Historical on-time performance
Atlanta to Houston
689 miData through May 2026Source: US DOT · BTS
Flights on ATL–IAH arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled2.0%of scheduled flights
based on 4,906 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time84%Medianon timep9030 minCancel1.2%Flights1,234
- Delta Air LinesOn-time74%Medianon timep9045 minCancel2.2%Flights2,492
- Frontier AirlinesOn-time64%Medianon timep90100 minCancel1.2%Flights738
- Spirit AirlinesOn-time61%Medianon timep9095 minCancel4.3%Flights442
Why flights run late
Delay causes
- Airline37%
- Weather3%
- Air traffic (NAS)26%
- Late aircraft34%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline56%
- Weather42%
- Air traffic (NAS)2%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 97 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 ATL → IAH
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 65% to 81% on time.
- Mornings81% on time · p90 25 min · 3,852 flights
- Middays81% on time · p90 35 min · 2,862 flights
- Afternoons71% on time · p90 55 min · 2,611 flights
- Evenings66% on time · p90 75 min · 2,696 flights
- Overnights65% on time · p90 75 min · 1,960 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 77% on time.
- Wednesdays77% on time · p90 40 min · 1,872 flights
- Tuesdays76% on time · p90 45 min · 1,891 flights
- Saturdays76% on time · p90 45 min · 1,777 flights
- Thursdays74% on time · p90 50 min · 2,134 flights
- Fridays73% on time · p90 55 min · 2,141 flights
- Mondays72% on time · p90 55 min · 2,111 flights
- Sundays71% on time · p90 65 min · 2,055 flights
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