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Flight Reliability

UA 4499 · United Airlines

Newark → Washington (EWR–DCA)92% of its flights flew this route. The rest (MDT–ORD, ORF–IAD) are included in these numbers.

41
Bring Snacks
WanderNerd Reliability Score
67%
Arrive within 15 minutes
28 min
Average arrival delay
5.8%
Cancelled
2 min early
Median arrival delay

Based on 346 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 4499 arrived on time 81% of the time on Saturdays and just 60% on Fridays. That gap is worth planning around.

Lagging the United Airlines network.

UA 4499 arrived on time 67% of the time, versus 79% across the United Airlines network.

Keep a backup plan handy.

UA 4499 was cancelled 5.8% of the time. Typical for U.S. flights is around 1–2%.

Trending in the right direction.

UA 4499 arrived on time 66% of the time over the last three months in the data, compared with 55% in the three months before that.

The breakdown

On-time by weekday
  • Mon72%(46 flights)
  • Tue67%(48 flights)
  • Wed61%(49 flights)
  • Thu64%(44 flights)
  • Fri60%(48 flights)
  • Sat81%(43 flights)
  • Sun62%(47 flights)
On-time by departure window
  • 6–9 AM—(5 flights)
  • 9 AM–12 PM—(9 flights)
  • 12–3 PM66%(308 flights)
  • 6–9 PM—(3 flights)
On-time trend by month
75%
May

Jun 70% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%30
July 202574%27
August 202593%28
September 202580%30
October 202577%30
November 202524%21
December 202539%23
January 202667%27
February 202660%25
March 202669%26
April 202653%30
May 202675%28
Departures on time
76%
Diverted
0.3%
Flights flown
325
Months covered
12

Same route, other flights

Keep nerding

Based on 346 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.