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Flight Reliability

UA 4829 · United Airlines

Manchester → Washington (MHT–IAD)88% of its flights flew this route. The rest (IAD–ITH, IAD–PIT) are included in these numbers.

59
A Little Dicey
WanderNerd Reliability Score
78%
Arrive within 15 minutes
21 min
Average arrival delay
4.0%
Cancelled
7 min early
Median arrival delay

Based on 251 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 4829 departing between 6–9 AM arrived on time 91% of the time, versus 76% between 6–9 PM.

Friday is doing you no favors.

UA 4829 arrived on time 88% of the time on Thursdays and just 67% on Fridays. That gap is worth planning around.

Keep a backup plan handy.

UA 4829 was cancelled 4.0% of the time. Typical for U.S. flights is around 1–2%.

Ticking up lately.

UA 4829 arrived on time 80% of the time over the last three months in the data, compared with 74% in the three months before that.

The breakdown

On-time by weekday
  • Mon79%(34 flights)
  • Tue83%(30 flights)
  • Wed78%(32 flights)
  • Thu88%(40 flights)
  • Fri67%(39 flights)
  • Sat68%(25 flights)
  • Sun79%(38 flights)
On-time by departure window
  • 6–9 AM91%(23 flights)
  • 12–3 PM—(5 flights)
  • 6–9 PM76%(210 flights)
On-time trend by month
78%
May

Jun 79% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%28
July 202569%16
August 202573%11
October 202591%23
December 202562%26
January 202672%29
February 202687%23
March 202679%24
April 202683%30
May 202678%23
Departures on time
78%
Diverted
1.2%
Flights flown
238
Months covered
11

Same route, other flights

Keep nerding

Based on 251 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.