Historical on-time performance
Las Vegas to Washington
2,066 miData through Dec 2025Source: US DOT · BTS
Flights on LAS–IAD arrive on time 86% of the time over the last 12 months.
On-time rate86%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 1,219 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time87%Medianon timep9020 minCancel0.3%Flights1,157
- Frontier AirlinesOn-time74%Medianon timep9065 minCancel0.0%Flights62
Why flights run late
Delay causes
- Airline35%
- Weather0%
- Air traffic (NAS)22%
- Late aircraft43%
- 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 → IAD
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 — 89% on time.
- Mornings89% on time · p90 15 min · 886 flights
- Overnights84% on time · p90 30 min · 1,000 flights
- Middays76% on time · p90 45 min · 1,077 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 89% on time.
- Tuesdays89% on time · p90 15 min · 415 flights
- Wednesdays87% on time · p90 15 min · 425 flights
- Saturdays85% on time · p90 35 min · 419 flights
- Mondays80% on time · p90 35 min · 430 flights
- Fridays79% on time · p90 25 min · 433 flights
- Thursdays79% on time · p90 35 min · 433 flights
- Sundays79% on time · p90 45 min · 437 flights
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