Historical on-time performance
Houston to Las Vegas
1,222 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–LAS arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 3,353 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-time81%Medianon timep9035 minCancel0.7%Flights2,604
- Spirit AirlinesOn-time81%Medianon timep9040 minCancel0.8%Flights749
Why flights run late
Delay causes
- Airline32%
- Weather8%
- Air traffic (NAS)27%
- Late aircraft33%
- 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 → LAS
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 87% on time.
- Mornings87% on time · p90 20 min · 3,574 flights
- Middays78% on time · p90 40 min · 1,926 flights
- Afternoons75% on time · p90 55 min · 2,269 flights
- Overnights70% on time · p90 60 min · 2,172 flights
- Evenings68% on time · p90 70 min · 2,153 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 81% on time.
- Saturdays81% on time · p90 35 min · 1,644 flights
- Wednesdays81% on time · p90 35 min · 1,670 flights
- Tuesdays79% on time · p90 40 min · 1,600 flights
- Sundays76% on time · p90 45 min · 1,782 flights
- Thursdays74% on time · p90 55 min · 1,768 flights
- Mondays74% on time · p90 50 min · 1,819 flights
- Fridays73% on time · p90 65 min · 1,811 flights
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