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Flight Reliability

UA 4187 · United Airlines

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

56
A Little Dicey
WanderNerd Reliability Score
69%
Arrive within 15 minutes
24 min
Average arrival delay
3.6%
Cancelled
1 min early
Median arrival delay

Based on 359 historical flights. Data through May 2026.

What the data says

Mondays have been rough.

UA 4187 arrived on time 80% of the time on Tuesdays and just 61% on Mondays. That gap is worth planning around.

A bit behind the IAD–EWR route.

UA 4187 arrived on time 69% of the time, versus 73% across the IAD–EWR route.

Lagging the United Airlines network.

UA 4187 arrived on time 69% of the time, versus 79% across the United Airlines network.

Keep a backup plan handy.

UA 4187 was cancelled 3.6% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon61%(49 flights)
  • Tue80%(49 flights)
  • Wed71%(51 flights)
  • Thu63%(49 flights)
  • Fri69%(52 flights)
  • Sat67%(49 flights)
  • Sun72%(47 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 12–3 PM70%(336 flights)
  • 6–9 PM—(9 flights)
On-time trend by month
73%
May

Jun 60% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%25
July 202563%27
August 202565%31
September 202583%29
October 202553%30
November 202579%28
December 202560%30
January 202659%29
February 202685%26
March 202671%31
April 202680%30
May 202673%30
Departures on time
74%
Diverted
0%
Flights flown
346
Months covered
12

Same route, other flights

Keep nerding

Based on 359 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.