Historical on-time performance
Las Vegas to Seattle
866 miData through May 2026Source: US DOT · BTS
Flights on LAS–SEA arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 5,443 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Spirit AirlinesOn-time87%Medianon timep9020 minCancel0.0%Flights71
- Delta Air LinesbestOn-time87%Medianon timep9020 minCancel1.0%Flights1,735
- Alaska AirlinesOn-time81%Medianon timep9030 minCancel1.3%Flights2,660
- Southwest AirlinesOn-time71%Medianon timep9040 minCancel0.4%Flights977
Why flights run late
Delay causes
- Airline35%
- Weather3%
- Air traffic (NAS)17%
- Late aircraft46%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline76%
- Weather16%
- Air traffic (NAS)7%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 55 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 LAS → SEA
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 — 88% on time.
- Mornings88% on time · p90 15 min · 5,340 flights
- Middays84% on time · p90 25 min · 4,714 flights
- Afternoons74% on time · p90 45 min · 3,687 flights
- Evenings70% on time · p90 50 min · 3,093 flights
- Overnights69% on time · p90 50 min · 1,954 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 85% on time.
- Wednesdays85% on time · p90 20 min · 2,467 flights
- Tuesdays85% on time · p90 20 min · 2,475 flights
- Saturdays83% on time · p90 30 min · 2,375 flights
- Mondays79% on time · p90 35 min · 2,871 flights
- Thursdays77% on time · p90 40 min · 2,864 flights
- Sundays76% on time · p90 40 min · 2,872 flights
- Fridays73% on time · p90 50 min · 2,864 flights
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