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Flight Reliability

UA 4227 · United Airlines

AVP → Washington (AVP–IAD)97% of its flights flew this route. The rest (BDL–IAD, BTV–IAD) are included in these numbers.

88
Pretty Reliable
WanderNerd Reliability Score
88%
Arrive within 15 minutes
3 min
Average arrival delay
2.0%
Cancelled
12 min early
Median arrival delay

Based on 358 historical flights. Data through May 2026.

What the data says

Saturday is the weak spot.

UA 4227 arrived on time 94% of the time on Wednesdays. On Saturdays: 80%.

Better than the United Airlines network average.

UA 4227 arrived on time 88% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue84%(51 flights)
  • Wed94%(50 flights)
  • Thu90%(52 flights)
  • Fri92%(52 flights)
  • Sat80%(45 flights)
  • Sun86%(51 flights)
On-time by departure window
  • 9 AM–12 PM90%(342 flights)
  • 12–3 PM—(5 flights)
  • 6–9 PM—(4 flights)
On-time trend by month
93%
May

Jun 90% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202587%31
August 202589%28
September 202593%27
October 202590%31
November 202597%29
December 202576%29
January 202679%29
February 202696%26
March 202674%31
April 202690%30
May 202693%30
Departures on time
88%
Diverted
0%
Flights flown
351
Months covered
12

Same route, other flights

Keep nerding

Based on 358 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.