Historical on-time performance
Washington to Los Angeles
Flights on IAD–LAX arrive on time 80% of the time over the last 12 months.
based on 2,385 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- United AirlinesOn-time81%Medianon timep9030 minCancel0.9%Flights2,293
- American AirlinesOn-time74%Medianon timep9040 minCancel0.0%Flights31
- Alaska AirlinesOn-time41%Median20 minp90125 minCancel0.0%Flights61
Why flights run late
Delay causes
- Airline36%
- Weather12%
- Air traffic (NAS)19%
- Late aircraft33%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline60%
- Weather40%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 20 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 IAD → LAX
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Middays are the most reliable time of day to fly this route — 90% on time.
- Middays90% on time · p90 10 min · 1,122 flights
- Mornings86% on time · p90 15 min · 2,134 flights
- Afternoons81% on time · p90 30 min · 744 flights
- Overnights79% on time · p90 35 min · 1,221 flights
- Evenings72% on time · p90 60 min · 2,298 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 84% on time.
- Tuesdays84% on time · p90 20 min · 1,030 flights
- Wednesdays82% on time · p90 30 min · 1,050 flights
- Mondays82% on time · p90 25 min · 1,101 flights
- Fridays81% on time · p90 30 min · 1,124 flights
- Thursdays79% on time · p90 30 min · 1,111 flights
- Saturdays78% on time · p90 35 min · 999 flights
- Sundays78% on time · p90 45 min · 1,104 flights
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