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Flight Reliability

UA 4333 · United Airlines

Washington → CHO (IAD–CHO)85% of its flights flew this route. The rest (SCE–IAD, IAD–PIT) are included in these numbers.

87
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
5 min
Average arrival delay
1.5%
Cancelled
14 min early
Median arrival delay

Based on 328 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 88% of the time, against 83% between 6–9 AM.

Thursday is the weak spot.

UA 4333 arrived on time 90% of the time on Wednesdays. On Thursdays: 79%.

A bit ahead of the IAD–CHO route.

UA 4333 arrived on time 85% of the time, versus 79% across the IAD–CHO route.

A bit ahead of the United Airlines network.

UA 4333 arrived on time 85% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon84%(49 flights)
  • Tue84%(49 flights)
  • Wed90%(41 flights)
  • Thu79%(48 flights)
  • Fri87%(45 flights)
  • Sat88%(51 flights)
  • Sun80%(40 flights)
On-time by departure window
  • 6–9 AM83%(169 flights)
  • 9 AM–12 PM88%(105 flights)
  • 12–3 PM—(8 flights)
  • 3–6 PM—(2 flights)
  • 6–9 PM85%(39 flights)
On-time trend by month
97%
May

Jun 72% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%29
July 202577%22
August 202585%26
September 202589%27
October 202590%31
November 202582%27
December 202577%30
January 202677%30
February 202693%14
March 202685%27
April 202693%30
May 202697%30
Departures on time
86%
Diverted
0%
Flights flown
323
Months covered
12

Same route, other flights

Keep nerding

Based on 328 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.