IAH to IAD flight delays & on-time performance
Nonstop flights from George Bush Intercontinental Airport to Washington Dulles International Airport · 1,190 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAH or IAD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (IAH) to Washington (IAD) arrived on time 81% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.4% were cancelled, and 6% arrived an hour or more late.
- United Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 7am did best (91% on time); around 7pm did worst (77%).
- Monday was the most reliable day to fly (85% on time) and Saturday the least (78%).
- The largest source of delay minutes was late-arriving aircraft (32%).
Which airline is most on time from IAH to IAD?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 81% | 0.4% | 13 min | 6.2% | 1,871 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am91%364 flights
- 10am89%35 flights
- 12pm80%365 flights
- 2pm84%81 flights
- 3pm82%33 flights
- 4pm79%345 flights
- 5pm76%25 flights
- 6pm77%343 flights
- 7pm77%206 flights
- 8pm77%74 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday85%0.8% cancelled
- Tuesday82%0.0% cancelled
- Wednesday81%0.0% cancelled
- Thursday83%0.4% cancelled
- Friday79%0.0% cancelled
- Saturday78%0.4% cancelled
- Sunday82%1.1% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft32%
- Airline (crew, maintenance, cleaning, fueling)31%
- Air traffic control & airport congestion30%
- Extreme weather7%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Air traffic control & airport congestion0%
- Security0%
IAH to IAD: common questions
- How often are IAH to IAD flights on time?
- 81% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Houston to Washington cancelled?
- 0.4% of scheduled flights were cancelled (7 of 1,871).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 62 min behind schedule on average, and 6.2% of flights were an hour or more late.
- How long is taxi time at IAH?
- Flights on this route spent 23 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAD to IAH — 84% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAH → IAD, nonstop flights by US airlines that report to the DOT. How we calculate this.