OnTimeStats

Historical on-time performance

Denver to Atlanta

1,199 miData through May 2026Source: US DOT · BTS

Flights on DEN–ATL arrive on time 79% of the time over the last 12 months.

On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights

based on 5,586 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Delta Air Linesbest
    On-time84%
    Medianon time
    p9025 min
    Cancel1.2%
    Flights2,802
  • Frontier Airlines
    On-time78%
    Medianon time
    p9040 min
    Cancel0.7%
    Flights710
  • United Airlines
    On-time77%
    Medianon time
    p9050 min
    Cancel0.4%
    Flights992
  • Southwest Airlines
    On-time66%
    Medianon time
    p9055 min
    Cancel0.8%
    Flights1,082

Why flights run late

Delay causes

  • Airline40%
  • Weather4%
  • Air traffic (NAS)15%
  • Late aircraft41%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline45%
  • Weather43%
  • Air traffic (NAS)12%
  • Security0%

Most cancellations here are attributed to Airline. Shares are among 51 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 DEN → ATL

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 — 86% on time.

  • Mornings86% on time · p90 20 min · 5,326 flights
  • Middays80% on time · p90 35 min · 5,389 flights
  • Early mornings79% on time · p90 35 min · 1,156 flights
  • Afternoons73% on time · p90 50 min · 2,989 flights
  • Evenings63% on time · p90 75 min · 2,156 flights
  • Overnights60% on time · p90 75 min · 615 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 75% to 82% on time.

  • Wednesdays82% on time · p90 30 min · 2,467 flights
  • Tuesdays81% on time · p90 35 min · 2,504 flights
  • Mondays79% on time · p90 35 min · 2,607 flights
  • Thursdays76% on time · p90 40 min · 2,559 flights
  • Saturdays75% on time · p90 45 min · 2,361 flights
  • Sundays75% on time · p90 45 min · 2,519 flights
  • Fridays75% on time · p90 45 min · 2,614 flights

Keep exploring

Related pages

Delay predictorfor this route→DEN airportDenver→ATL airportAtlanta→Delta Air Linesairline profile→Southwest Airlinesairline profile→United Airlinesairline profile→Seasonal delay patternsguide→

Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.