Historical on-time performance
Washington to Houston
1,190 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–IAH arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,930 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 timep9035 minCancel0.6%Flights1,930
Why flights run late
Delay causes
- Airline28%
- Weather13%
- Air traffic (NAS)32%
- Late aircraft27%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → IAH
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 63% to 86% on time.
- Mornings86% on time · p90 20 min · 2,178 flights
- Middays84% on time · p90 25 min · 1,154 flights
- Overnights73% on time · p90 45 min · 763 flights
- Evenings65% on time · p90 65 min · 1,096 flights
- Afternoons63% on time · p90 65 min · 123 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 81% on time.
- Tuesdays81% on time · p90 30 min · 763 flights
- Sundays81% on time · p90 30 min · 760 flights
- Mondays79% on time · p90 35 min · 761 flights
- Wednesdays79% on time · p90 30 min · 758 flights
- Thursdays78% on time · p90 40 min · 754 flights
- Fridays77% on time · p90 35 min · 758 flights
- Saturdays77% on time · p90 40 min · 760 flights
Advertisement
Keep exploring