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Flight Reliability

UA 2311 · United Airlines

Houston → Washington (IAH–DCA)86% of its flights flew this route. The rest (LAX–IAH, ORD–RSW) are included in these numbers.

91
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
3 min early
Average arrival delay
0.6%
Cancelled
9 min early
Median arrival delay

Based on 354 historical flights. Data through May 2026.

What the data says

The 12–3 AM departure wins.

UA 2311 departing between 12–3 AM arrived on time 97% of the time, versus 87% between 9 AM–12 PM.

Monday is the weak spot.

UA 2311 arrived on time 93% of the time on Tuesdays. On Mondays: 81%.

Better than the IAH–DCA route average.

UA 2311 arrived on time 88% of the time, versus 76% across the IAH–DCA route.

Better than the United Airlines network average.

UA 2311 arrived on time 88% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon81%(57 flights)
  • Tue93%(58 flights)
  • Wed93%(56 flights)
  • Thu86%(55 flights)
  • Fri84%(57 flights)
  • Sat90%(10 flights)
  • Sun90%(57 flights)
On-time by departure window
  • 12–3 AM97%(35 flights)
  • 3–6 AM91%(11 flights)
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM87%(303 flights)
On-time trend by month
76%
May

Jun 85% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%26
July 202589%26
August 202585%26
September 202589%26
October 202589%27
November 202589%26
December 202590%29
January 202686%50
February 202694%33
March 202689%26
April 202696%26
May 202676%29
Departures on time
88%
Diverted
0.6%
Flights flown
350
Months covered
12

Same route, other flights

Keep nerding

Based on 354 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.