Historical on-time performance
San Francisco to Houston
1,635 miData through May 2026Source: US DOT · BTS
Flights on SFO–IAH arrive on time 84% of the time over the last 12 months.
On-time rate84%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 3,596 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time84%Medianon timep9025 minCancel0.4%Flights3,596
Why flights run late
Delay causes
- Airline37%
- Weather1%
- Air traffic (NAS)31%
- Late aircraft31%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline38%
- Weather62%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 13 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 SFO → IAH
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 — 90% on time.
- Mornings90% on time · p90 10 min · 3,289 flights
- Early mornings86% on time · p90 20 min · 871 flights
- Overnights83% on time · p90 30 min · 1,104 flights
- Afternoons82% on time · p90 30 min · 1,540 flights
- Evenings81% on time · p90 35 min · 1,004 flights
- Middays74% on time · p90 35 min · 2,209 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 81% to 86% on time.
- Wednesdays86% on time · p90 20 min · 1,432 flights
- Tuesdays84% on time · p90 20 min · 1,399 flights
- Saturdays84% on time · p90 20 min · 1,409 flights
- Sundays83% on time · p90 25 min · 1,445 flights
- Thursdays83% on time · p90 30 min · 1,451 flights
- Mondays82% on time · p90 25 min · 1,443 flights
- Fridays81% on time · p90 30 min · 1,438 flights
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