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

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

66.6% of 601 official scheduled DEN-to-BUF flights arrived on time; 21.6% arrived at least 30 minutes late and 0.3% 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 SIGNALVariable
66.6%arrived on time
21.6%30+ min late
0.3%cancelled
601scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late11.5%all scheduled flights
120+ minutes late4.2%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+16.9 mincompleted flights

Which departure time was most reliable for DEN to BUF?

Among qualifying DEN-to-BUF departure window results, Late morning had the highest on-time rate: 80.5% of 118 flights. Afternoon was lowest at 56.9% across 58 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning11880.5%8.5%0.0%
Afternoon5856.9%17.2%1.7%
Evening40463.4%27.0%0.2%

Which weekday was most reliable for DEN to BUF?

Among qualifying DEN-to-BUF weekday results, Wednesday had the highest on-time rate: 73.2% of 71 flights. Saturday was lowest at 62.2% across 111 flights.

DayFlightsOn time30+ minCancelled
Monday9162.6%20.9%0.0%
Tuesday6866.2%22.1%1.5%
Wednesday7173.2%18.3%0.0%
Thursday7268.1%18.1%0.0%
Friday9367.7%22.6%0.0%
Saturday11162.2%25.2%0.0%
Sunday9568.4%22.1%1.1%

Which airline was most reliable for DEN to BUF?

Among qualifying DEN-to-BUF airline results, Frontier Airlines had the highest on-time rate: 81.2% of 48 flights. Southwest Airlines was lowest at 59.8% across 259 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines29470.1%20.7%0.0%
Southwest Airlines25959.8%24.7%0.8%
Frontier Airlines4881.2%10.4%0.0%

Which month was most reliable for DEN to BUF?

Among qualifying DEN-to-BUF month results, March 2026 had the highest on-time rate: 87.9% of 33 flights. July 2025 was lowest at 45.8% across 83 flights.

MonthFlightsOn time30+ minCancelled
July 20258345.8%39.8%1.2%
August 20258150.6%33.3%0.0%
September 20257763.6%23.4%0.0%
October 20257084.3%10.0%0.0%
November 20255278.8%5.8%0.0%
December 20252060.0%30.0%0.0%
February 20263773.0%13.5%2.7%
March 20263387.9%12.1%0.0%
April 20263378.8%9.1%0.0%
May 20263672.2%16.7%0.0%
June 20266563.1%24.6%0.0%

What drove DEN to BUF delay minutes?

Late aircraft was the largest recorded DEN-to-BUF delay category, accounting for 51.5% of 12,675 BTS-attributed delay minutes during July 2025–June 2026.

Airline29.1%
Late aircraft51.5%
National airspace16.1%
Weather3.4%
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.