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Flight Reliability

UA 4857 · United Airlines

Manchester → Washington (MHT–IAD)99% of its flights flew this route. The rest (BDL–IAD) are included in these numbers.

100
Nerd Approved
WanderNerd Reliability Score
93%
Arrive within 15 minutes
5 min early
Average arrival delay
0%
Cancelled
14 min early
Median arrival delay

Based on 171 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 4857 arrived on time 100% of the time on Wednesdays. On Fridays: 88%.

Better than the MHT–IAD route average.

UA 4857 arrived on time 93% of the time, versus 80% across the MHT–IAD route.

Better than the United Airlines network average.

UA 4857 arrived on time 93% of the time, versus 79% across the United Airlines network.

It basically never cancels.

Out of 171 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon92%(25 flights)
  • Tue92%(24 flights)
  • Wed100%(23 flights)
  • Thu100%(23 flights)
  • Fri88%(24 flights)
  • Sat92%(26 flights)
  • Sun89%(26 flights)
On-time by departure window
  • 9 AM–12 PM93%(169 flights)
  • 6–9 PM—(2 flights)
On-time trend by month
100%
May

Jun 83% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202597%31
August 202597%31
September 202587%30
November 2025100%30
May 2026100%10
Departures on time
95%
Diverted
0%
Flights flown
171
Months covered
9

Same route, other flights

Keep nerding

Based on 171 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.