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Flight Reliability

UA 4274 · United Airlines

Washington → Dayton (IAD–DAY)97% of its flights flew this route. The rest (IAD–CHS, ECP–IAH) are included in these numbers.

71
Usually Fine
WanderNerd Reliability Score
78%
Arrive within 15 minutes
14 min
Average arrival delay
2.8%
Cancelled
6 min early
Median arrival delay

Based on 351 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 4274 arrived on time 86% of the time on Mondays and just 71% on Fridays. That gap is worth planning around.

A bit behind the IAD–DAY route.

UA 4274 arrived on time 78% of the time, versus 82% across the IAD–DAY route.

The breakdown

On-time by weekday
  • Mon86%(51 flights)
  • Tue77%(51 flights)
  • Wed73%(48 flights)
  • Thu83%(48 flights)
  • Fri71%(51 flights)
  • Sat83%(42 flights)
  • Sun71%(49 flights)
On-time by departure window
  • 6–9 AM—(3 flights)
  • 12–3 PM—(5 flights)
  • 3–6 PM78%(332 flights)
On-time trend by month
74%
May

Jun 64% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%28
July 202548%21
August 202570%30
September 202593%30
October 202587%31
November 202570%23
December 202576%29
January 202686%29
February 202685%27
March 202677%31
April 202690%30
May 202674%31
Departures on time
77%
Diverted
0.3%
Flights flown
340
Months covered
12

Same route, other flights

Keep nerding

Based on 351 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.