Historical on-time performance
Seattle to Las Vegas
866 miData through May 2026Source: US DOT · BTS
Flights on SEA–LAS arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 5,445 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time83%Medianon timep9025 minCancel1.0%Flights1,735
- Alaska AirlinesOn-time75%Medianon timep9040 minCancel1.0%Flights2,661
- Spirit AirlinesOn-time68%Medianon timep9035 minCancel1.4%Flights72
- Southwest AirlinesOn-time68%Medianon timep9045 minCancel0.6%Flights977
Why flights run late
Delay causes
- Airline38%
- Weather2%
- Air traffic (NAS)26%
- Late aircraft33%
- Security1%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline72%
- Weather16%
- Air traffic (NAS)12%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 50 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 SEA → LAS
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 — 89% on time.
- Mornings89% on time · p90 15 min · 4,597 flights
- Middays77% on time · p90 35 min · 5,271 flights
- Afternoons73% on time · p90 45 min · 3,356 flights
- Overnights70% on time · p90 50 min · 1,921 flights
- Evenings69% on time · p90 50 min · 3,658 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 83% on time.
- Tuesdays83% on time · p90 25 min · 2,478 flights
- Wednesdays82% on time · p90 25 min · 2,478 flights
- Saturdays80% on time · p90 30 min · 2,369 flights
- Sundays76% on time · p90 40 min · 2,874 flights
- Mondays75% on time · p90 40 min · 2,871 flights
- Thursdays72% on time · p90 45 min · 2,865 flights
- Fridays72% on time · p90 50 min · 2,868 flights
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