Historical on-time performance
Atlanta to Denver
1,199 miData through May 2026Source: US DOT · BTS
Flights on ATL–DEN arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 5,582 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time84%Medianon timep9030 minCancel0.4%Flights992
- Delta Air LinesOn-time75%Medianon timep9045 minCancel1.2%Flights2,803
- Southwest AirlinesOn-time71%Medianon timep9055 minCancel1.3%Flights1,083
- Frontier AirlinesOn-time67%Medianon timep9070 minCancel1.3%Flights704
Why flights run late
Delay causes
- Airline34%
- Weather6%
- Air traffic (NAS)29%
- Late aircraft31%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline49%
- Weather41%
- Air traffic (NAS)10%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 61 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ATL → DEN
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 85% on time.
- Mornings85% on time · p90 20 min · 4,589 flights
- Middays82% on time · p90 25 min · 4,798 flights
- Afternoons71% on time · p90 55 min · 3,096 flights
- Overnights64% on time · p90 65 min · 2,688 flights
- Evenings63% on time · p90 80 min · 2,436 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 80% on time.
- Wednesdays80% on time · p90 30 min · 2,463 flights
- Tuesdays78% on time · p90 45 min · 2,457 flights
- Mondays76% on time · p90 45 min · 2,607 flights
- Saturdays75% on time · p90 40 min · 2,287 flights
- Thursdays75% on time · p90 50 min · 2,615 flights
- Fridays74% on time · p90 50 min · 2,615 flights
- Sundays72% on time · p90 50 min · 2,567 flights
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