Historical on-time performance
Houston to Washington
1,190 miData through May 2026Source: US DOT · BTS
Flights on IAH–IAD arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,862 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time79%Medianon timep9040 minCancel0.6%Flights1,862
Why flights run late
Delay causes
- Airline31%
- Weather12%
- Air traffic (NAS)22%
- Late aircraft35%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather100%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 11 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 IAH → IAD
All airlines · rolling 36 months (2023-06 .. 2026-05).
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 · 1,131 flights
- Overnights78% on time · p90 45 min · 102 flights · limited
- Afternoons76% on time · p90 45 min · 1,026 flights
- Middays72% on time · p90 40 min · 1,185 flights
- Evenings72% on time · p90 55 min · 1,876 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 80% on time.
- Tuesdays80% on time · p90 40 min · 745 flights
- Wednesdays78% on time · p90 40 min · 751 flights
- Thursdays77% on time · p90 35 min · 764 flights
- Mondays77% on time · p90 40 min · 755 flights
- Sundays76% on time · p90 40 min · 763 flights
- Saturdays75% on time · p90 45 min · 766 flights
- Fridays74% on time · p90 45 min · 776 flights
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