Historical on-time performance
Las Vegas to St. Louis
1,372 miData through Dec 2025Source: US DOT · BTS
Flights on LAS–STL arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,759 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time78%Medianon timep9040 minCancel0.6%Flights1,759
Why flights run late
Delay causes
- Airline38%
- Weather1%
- Air traffic (NAS)10%
- Late aircraft51%
- 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 LAS → STL
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 — 91% on time.
- Mornings91% on time · p90 10 min · 2,495 flights
- Middays72% on time · p90 40 min · 987 flights
- Evenings65% on time · p90 65 min · 1,225 flights
- Afternoons65% on time · p90 55 min · 1,177 flights
- Overnights59% on time · p90 65 min · 274 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 84% on time.
- Saturdays84% on time · p90 25 min · 666 flights
- Wednesdays83% on time · p90 30 min · 831 flights
- Tuesdays83% on time · p90 25 min · 831 flights
- Mondays74% on time · p90 40 min · 959 flights
- Fridays73% on time · p90 50 min · 960 flights
- Sundays72% on time · p90 45 min · 988 flights
- Thursdays72% on time · p90 50 min · 923 flights
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