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Flight Reliability

UA 4177 · United Airlines

Newark → Washington (EWR–IAD)95% of its flights flew this route. The rest (CAE–ORD, ORD–RIC) are included in these numbers.

71
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
11 min
Average arrival delay
2.7%
Cancelled
5 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 4177 departing between 9 AM–12 PM arrived on time 75% of the time, versus 59% between 12–3 PM.

Monday is the weak spot.

UA 4177 arrived on time 80% of the time on Sundays. On Mondays: 65%.

A bit behind the United Airlines network.

UA 4177 arrived on time 74% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 4177 arrived on time 78% of the time over the last three months in the data, compared with 65% in the three months before that.

The breakdown

On-time by weekday
  • Mon65%(49 flights)
  • Tue70%(50 flights)
  • Wed75%(52 flights)
  • Thu75%(51 flights)
  • Fri75%(52 flights)
  • Sat77%(51 flights)
  • Sun80%(50 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM75%(337 flights)
  • 12–3 PM59%(17 flights)
On-time trend by month
77%
May

Jun 83% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202572%29
August 202590%31
September 202583%30
October 202565%31
November 202562%29
December 202548%29
January 202666%29
February 202681%26
March 202677%30
April 202680%30
May 202677%31
Departures on time
78%
Diverted
0%
Flights flown
355
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.