Historical on-time performance
Washington to Denver
Flights on IAD–DEN arrive on time 80% of the time over the last 12 months.
based on 3,624 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time82%Medianon timep9030 minCancel0.5%Flights2,787
- Southwest AirlinesOn-time74%Medianon timep9040 minCancel1.3%Flights837
Why flights run late
Delay causes
- Airline26%
- Weather9%
- Air traffic (NAS)30%
- Late aircraft35%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline20%
- Weather68%
- Air traffic (NAS)12%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 25 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 → DEN
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 69% to 89% on time.
- Mornings89% on time · p90 15 min · 2,209 flights
- Middays87% on time · p90 20 min · 2,358 flights
- Overnights78% on time · p90 40 min · 1,206 flights
- Afternoons76% on time · p90 40 min · 1,959 flights
- Evenings69% on time · p90 65 min · 2,238 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 82% on time.
- Wednesdays82% on time · p90 30 min · 1,412 flights
- Mondays82% on time · p90 30 min · 1,463 flights
- Tuesdays80% on time · p90 30 min · 1,398 flights
- Sundays80% on time · p90 40 min · 1,400 flights
- Saturdays80% on time · p90 35 min · 1,333 flights
- Fridays79% on time · p90 45 min · 1,487 flights
- Thursdays78% on time · p90 40 min · 1,477 flights
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