Historical on-time performance
Houston to Washington
1,208 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–DCA arrive on time 72% of the time over the last 12 months.
On-time rate72%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.5%of scheduled flights
based on 2,667 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Republic AirwaysOn-time73%Medianon timep9050 minCancel3.0%Flights305
- United AirlinesOn-time72%Medianon timep9060 minCancel1.4%Flights2,362
Why flights run late
Delay causes
- Airline19%
- Weather7%
- Air traffic (NAS)37%
- Late aircraft36%
- 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 IAH → DCA
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 — 86% on time.
- Mornings86% on time · p90 20 min · 1,948 flights
- Middays77% on time · p90 40 min · 1,203 flights
- Afternoons71% on time · p90 60 min · 1,911 flights
- Evenings68% on time · p90 65 min · 1,804 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 79% on time.
- Tuesdays79% on time · p90 40 min · 1,060 flights
- Saturdays77% on time · p90 45 min · 674 flights
- Wednesdays77% on time · p90 50 min · 1,057 flights
- Mondays75% on time · p90 40 min · 1,059 flights
- Thursdays73% on time · p90 50 min · 1,037 flights
- Sundays73% on time · p90 55 min · 975 flights
- Fridays73% on time · p90 55 min · 1,033 flights
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