Historical on-time performance
Washington to Las Vegas
2,066 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–LAS arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 1,222 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-time79%Medianon timep9045 minCancel0.2%Flights1,161
- Frontier AirlinesOn-time77%Medianon timep9080 minCancel0.0%Flights61
Why flights run late
Delay causes
- Airline28%
- Weather13%
- Air traffic (NAS)27%
- Late aircraft32%
- 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 IAD → 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 — 88% on time.
- Mornings88% on time · p90 15 min · 1,217 flights
- Middays84% on time · p90 25 min · 574 flights
- Overnights77% on time · p90 50 min · 105 flights · limited
- Evenings74% on time · p90 60 min · 1,013 flights
- Afternoons64% on time · p90 45 min · 88 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 85% on time.
- Wednesdays85% on time · p90 25 min · 420 flights
- Tuesdays85% on time · p90 25 min · 415 flights
- Saturdays82% on time · p90 30 min · 424 flights
- Mondays82% on time · p90 30 min · 439 flights
- Sundays81% on time · p90 45 min · 435 flights
- Thursdays80% on time · p90 40 min · 431 flights
- Fridays77% on time · p90 50 min · 433 flights
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