Historical on-time performance
Houston to Washington
1,190 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–IAD arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,931 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time78%Medianon timep9040 minCancel0.6%Flights1,931
Why flights run late
Delay causes
- Airline33%
- Weather14%
- Air traffic (NAS)19%
- Late aircraft34%
- 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 IAH → 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 — 91% on time.
- Mornings91% on time · p90 10 min · 1,133 flights
- Overnights77% on time · p90 50 min · 91 flights · limited
- Afternoons76% on time · p90 45 min · 1,017 flights
- Middays71% on time · p90 45 min · 1,185 flights
- Evenings70% on time · p90 55 min · 1,894 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 79% on time.
- Tuesdays79% on time · p90 45 min · 757 flights
- Wednesdays78% on time · p90 40 min · 757 flights
- Mondays76% on time · p90 45 min · 761 flights
- Thursdays76% on time · p90 40 min · 756 flights
- Sundays75% on time · p90 40 min · 760 flights
- Saturdays75% on time · p90 45 min · 759 flights
- Fridays74% on time · p90 45 min · 770 flights
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