Historical on-time performance
Houston to Atlanta
689 miData through May 2026Source: US DOT · BTS
Flights on IAH–ATL arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled2.0%of scheduled flights
based on 4,869 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time81%Medianon timep9040 minCancel0.8%Flights1,236
- Delta Air LinesOn-time78%Medianon timep9040 minCancel2.3%Flights2,491
- Spirit AirlinesOn-time74%Medianon timep9045 minCancel3.5%Flights404
- Frontier AirlinesOn-time59%Medianon timep9080 minCancel2.2%Flights738
Why flights run late
Delay causes
- Airline33%
- Weather3%
- Air traffic (NAS)23%
- Late aircraft41%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline57%
- Weather41%
- 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 IAH → ATL
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 · 5,103 flights
- Middays77% on time · p90 45 min · 2,616 flights
- Afternoons72% on time · p90 65 min · 2,517 flights
- Overnights66% on time · p90 65 min · 797 flights
- Evenings65% on time · p90 75 min · 2,934 flights
Best day of week
Wednesdays are the most reliable day to fly this route — 81% on time.
- Wednesdays81% on time · p90 40 min · 1,887 flights
- Tuesdays78% on time · p90 45 min · 1,884 flights
- Saturdays76% on time · p90 50 min · 1,782 flights
- Thursdays76% on time · p90 50 min · 2,136 flights
- Fridays75% on time · p90 50 min · 2,131 flights
- Mondays73% on time · p90 55 min · 2,107 flights
- Sundays71% on time · p90 60 min · 2,040 flights
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