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Flight Reliability

UA 4920 · United Airlines

Dayton → Washington (DAY–IAD)88% of its flights flew this route. The rest (ITH–IAD, IAH–SHV) are included in these numbers.

82
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
9 min
Average arrival delay
2.2%
Cancelled
11 min early
Median arrival delay

Based on 182 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 4920 arrived on time 92% of the time on Sundays. On Fridays: 78%.

A bit ahead of the United Airlines network.

UA 4920 arrived on time 83% of the time, versus 79% across the United Airlines network.

Recent months have been rougher.

UA 4920 arrived on time 78% of the time over the last three months in the data, compared with 88% in the three months before that.

The breakdown

On-time by weekday
  • Mon81%(26 flights)
  • Tue85%(26 flights)
  • Wed88%(24 flights)
  • Thu79%(24 flights)
  • Fri78%(27 flights)
  • Sat81%(26 flights)
  • Sun92%(25 flights)
On-time by departure window
  • 9 AM–12 PM83%(177 flights)
  • 12–3 PM—(1 flights)
On-time trend by month
83%
May

Jun 79% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%28
July 202581%31
August 202586%28
September 202597%30
October 202581%26
December 202569%16
May 202683%18
Departures on time
83%
Diverted
0%
Flights flown
178
Months covered
8

Same route, other flights

Keep nerding

Based on 182 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.