BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
BUF→DEN

Buffalo, NY (BUF) to Denver, CO (DEN) flight delay odds

76.7% of 600 official scheduled BUF-to-DEN flights arrived on time; 13.0% arrived at least 30 minutes late and 0.2% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
76.7%arrived on time
13.0%30+ min late
0.2%cancelled
600scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.8%all scheduled flights
120+ minutes late2.7%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+7.4 mincompleted flights

Which departure time was most reliable for BUF to DEN?

Among qualifying BUF-to-DEN departure window results, Early morning had the highest on-time rate: 85.6% of 360 flights. Afternoon was lowest at 54.4% across 114 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning36085.6%7.2%0.0%
Late morning9379.6%6.5%1.1%
Afternoon11454.4%29.8%0.0%

Which weekday was most reliable for BUF to DEN?

Among qualifying BUF-to-DEN weekday results, Thursday had the highest on-time rate: 87.5% of 72 flights. Saturday was lowest at 70.3% across 111 flights.

DayFlightsOn time30+ minCancelled
Monday9174.7%18.7%1.1%
Tuesday6873.5%10.3%0.0%
Wednesday7074.3%15.7%0.0%
Thursday7287.5%6.9%0.0%
Friday9376.3%11.8%0.0%
Saturday11170.3%16.2%0.0%
Sunday9582.1%9.5%0.0%

Which airline was most reliable for BUF to DEN?

Among qualifying BUF-to-DEN airline results, United Airlines had the highest on-time rate: 84.0% of 293 flights. Frontier Airlines was lowest at 62.5% across 48 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines29384.0%8.5%0.0%
Southwest Airlines25971.0%15.1%0.4%
Frontier Airlines4862.5%29.2%0.0%

Which month was most reliable for BUF to DEN?

Among qualifying BUF-to-DEN month results, October 2025 had the highest on-time rate: 87.1% of 70 flights. December 2025 was lowest at 60.0% across 20 flights.

MonthFlightsOn time30+ minCancelled
July 20258381.9%10.8%0.0%
August 20258181.5%13.6%0.0%
September 20257775.3%13.0%0.0%
October 20257087.1%8.6%0.0%
November 20255278.8%5.8%0.0%
December 20252060.0%15.0%5.0%
February 20263669.4%16.7%0.0%
March 20263372.7%9.1%0.0%
April 20263384.8%15.2%0.0%
May 20263677.8%11.1%0.0%
June 20266561.5%24.6%0.0%

What drove BUF to DEN delay minutes?

Airline was the largest recorded BUF-to-DEN delay category, accounting for 35.2% of 8,154 BTS-attributed delay minutes during July 2025–June 2026.

Airline35.2%
Late aircraft33.7%
National airspace28.5%
Weather2.6%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.