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Flight Reliability

UA 1727 · United Airlines

Buffalo → Denver (BUF–DEN)80% of its flights flew this route. The rest (JAC–DEN, EWR–CLE) are included in these numbers.

92
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
4 min
Average arrival delay
0.3%
Cancelled
5 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

UA 1727 departing between 12–3 PM arrived on time 94% of the time, versus 73% between 9 AM–12 PM.

Friday is doing you no favors.

UA 1727 arrived on time 92% of the time on Saturdays. On Fridays: 81%.

A bit ahead of the BUF–DEN route.

UA 1727 arrived on time 85% of the time, versus 81% across the BUF–DEN route.

A bit ahead of the United Airlines network.

UA 1727 arrived on time 85% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon81%(52 flights)
  • Tue85%(52 flights)
  • Wed83%(52 flights)
  • Thu90%(52 flights)
  • Fri81%(52 flights)
  • Sat92%(51 flights)
  • Sun87%(53 flights)
On-time by departure window
  • 6–9 AM85%(300 flights)
  • 9 AM–12 PM73%(11 flights)
  • 12–3 PM94%(16 flights)
  • 3–6 PM87%(37 flights)
On-time trend by month
84%
May

Jun 93% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%29
July 202587%31
August 202594%31
September 202593%30
October 202590%31
November 202580%30
December 202587%31
January 202684%31
February 202668%28
March 202674%31
April 202690%30
May 202684%31
Departures on time
86%
Diverted
0%
Flights flown
364
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.