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Route Reliability

Denver → Buffalo

DEN–BUF · 1,359 miles · Denver International Airport to Buffalo Niagara International Airport

68
Usually Fine
WanderNerd Reliability Score
66%
Arrive within 15 minutes
19 min
Average arrival delay
0.3%
Cancelled
615
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines68%294 flights
  2. 2.Southwest Airlines60%262 flights

Not enough history to rank: Frontier Airlines (59 flights). We rank airlines only after 100 flights on the route.

What the data says

Morning-you made the right choice.

DEN–BUF flights departing between 9 AM–12 PM arrived on time 81% of the time, versus 46% between 6–9 PM.

Skip Saturday if you can.

DEN–BUF flights arrived on time 72% of the time on Wednesdays. On Saturdays: 63%.

United Airlines runs this route best.

United Airlines arrived on time 68% of the time on this route; Southwest Airlines managed 60%.

It basically never cancels.

Out of 615 scheduled flights, only 0.3% were cancelled.

Flights on this route

The breakdown

On-time by weekday
  • Mon65%(96 flights)
  • Tue64%(66 flights)
  • Wed72%(74 flights)
  • Thu69%(72 flights)
  • Fri66%(97 flights)
  • Sat63%(111 flights)
  • Sun67%(96 flights)
On-time by departure window
  • 6–9 AM77%(31 flights)
  • 9 AM–12 PM81%(127 flights)
  • 12–3 PM48%(27 flights)
  • 3–6 PM65%(372 flights)
  • 6–9 PM46%(55 flights)
On-time trend by month
75%
May

Jun 51% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202551%79
July 202546%82
August 202551%80
September 202564%77
October 202586%70
November 202583%52
December 202565%20
January 202679%14
February 202678%36
March 202688%33
April 202679%33
May 202675%36

Keep nerding

Based on 615 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.