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Route Reliability

Washington → Houston

IAD–IAH · 1,190 miles · Washington Dulles International Airport to George Bush Intercontinental Airport

89
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
0 min
Average arrival delay
0.6%
Cancelled
1,865
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 84% of the time across 1,865 flights. No comparison to make.

What the data says

Morning-you made the right choice.

IAD–IAH flights departing between 6–9 AM arrived on time 92% of the time, versus 70% between 3–6 PM.

Friday is doing you no favors.

IAD–IAH flights arrived on time 89% of the time on Tuesdays. On Fridays: 80%.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon84%(267 flights)
  • Tue89%(261 flights)
  • Wed84%(259 flights)
  • Thu83%(264 flights)
  • Fri80%(269 flights)
  • Sat82%(266 flights)
  • Sun84%(267 flights)
On-time by departure window
  • 6–9 AM92%(709 flights)
  • 9 AM–12 PM90%(68 flights)
  • 12–3 PM84%(369 flights)
  • 3–6 PM70%(424 flights)
  • 6–9 PM—(1 flights)
  • 9 PM–12 AM82%(282 flights)
On-time trend by month
84%
May

Jun 71% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%173
July 202572%154
August 202580%174
September 202593%195
October 202583%180
November 202588%148
December 202578%139
January 202690%124
February 202694%112
March 202685%142
April 202689%146
May 202684%166

Same trip, other airports

Keep nerding

Based on 1,865 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.