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

Atlanta, GA (ATL) to Denver, CO (DEN) flight delay odds

76.4% of 5,589 official scheduled ATL-to-DEN flights arrived on time; 14.1% arrived at least 30 minutes late and 1.0% 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
76.4%arrived on time
14.1%30+ min late
1.0%cancelled
5,589scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.1%all scheduled flights
120+ minutes late2.1%all scheduled flights
Diverted0.5%did not reach as scheduled
Average arrival+6.8 mincompleted flights

Which departure time was most reliable for ATL to DEN?

Among qualifying ATL-to-DEN departure window results, Early morning had the highest on-time rate: 85.9% of 1,089 flights. Evening was lowest at 62.4% across 1,190 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,08985.9%7.6%1.4%
Late morning1,07085.0%7.3%1.1%
Afternoon1,77376.0%13.8%0.4%
Evening1,19062.4%25.7%1.1%
Night46771.7%16.1%2.1%

Which weekday was most reliable for ATL to DEN?

Among qualifying ATL-to-DEN weekday results, Wednesday had the highest on-time rate: 83.4% of 776 flights. Sunday was lowest at 70.4% across 827 flights.

DayFlightsOn time30+ minCancelled
Monday82673.1%15.9%0.7%
Tuesday79979.1%14.3%0.5%
Wednesday77683.4%9.8%0.1%
Thursday81976.2%15.1%0.1%
Friday82478.5%11.4%1.8%
Saturday71874.4%13.8%2.2%
Sunday82770.4%18.0%1.7%

Which airline was most reliable for ATL to DEN?

Among qualifying ATL-to-DEN airline results, United Airlines had the highest on-time rate: 84.6% of 967 flights. Frontier Airlines was lowest at 69.8% across 738 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines2,80576.9%13.5%1.1%
Southwest Airlines1,07972.2%15.7%1.1%
United Airlines96784.6%9.8%0.4%
Frontier Airlines73869.8%19.5%1.4%

Which month was most reliable for ATL to DEN?

Among qualifying ATL-to-DEN month results, November 2025 had the highest on-time rate: 85.5% of 449 flights. July 2025 was lowest at 66.9% across 526 flights.

MonthFlightsOn time30+ minCancelled
July 202552666.9%21.7%0.8%
August 202549570.3%18.2%0.8%
September 202545081.1%10.0%0.2%
October 202547478.1%12.9%0.0%
November 202544985.5%8.7%1.1%
December 202545767.0%21.4%1.8%
January 202642981.8%8.6%3.0%
February 202641079.8%13.2%0.5%
March 202645975.8%13.7%2.8%
April 202644279.9%8.8%0.2%
May 202648377.0%13.9%0.8%
June 202651576.5%15.5%0.4%

What drove ATL to DEN delay minutes?

Airline was the largest recorded ATL-to-DEN delay category, accounting for 34.0% of 74,574 BTS-attributed delay minutes during July 2025–June 2026.

Airline34.0%
Late aircraft32.6%
National airspace28.4%
Weather4.7%
Security0.3%
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.