Historical on-time performance
Houston to San Diego
1,303 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–SAN arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 1,673 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time78%Medianon timep9045 minCancel0.9%Flights1,673
Why flights run late
Delay causes
- Airline31%
- Weather11%
- Air traffic (NAS)18%
- Late aircraft40%
- 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 IAH → SAN
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 71% to 84% on time.
- Mornings84% on time · p90 20 min · 1,433 flights
- Middays82% on time · p90 50 min · 848 flights
- Afternoons80% on time · p90 45 min · 935 flights
- Evenings72% on time · p90 55 min · 1,268 flights
- Overnights71% on time · p90 50 min · 811 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 80% on time.
- Tuesdays80% on time · p90 40 min · 719 flights
- Saturdays79% on time · p90 40 min · 687 flights
- Wednesdays79% on time · p90 35 min · 775 flights
- Mondays78% on time · p90 50 min · 786 flights
- Thursdays77% on time · p90 45 min · 775 flights
- Sundays77% on time · p90 45 min · 779 flights
- Fridays77% on time · p90 45 min · 774 flights
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