OnTimeStats

Historical on-time performance

Denver to Memphis

872 miData through Dec 2025Source: US DOT · BTS

Flights on DEN–MEM arrive on time 69% of the time over the last 12 months.

On-time rate69%arrived within 15 min
p90 delay70 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights

based on 1,064 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time73%
    Medianon time
    p9055 min
    Cancel0.4%
    Flights728
  • Southwest Airlines
    On-time61%
    Median5 min
    p9095 min
    Cancel0.9%
    Flights336

Why flights run late

Delay causes

  • Airline29%
  • Weather1%
  • Air traffic (NAS)11%
  • Late aircraft59%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly DEN → MEM

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 45% to 85% on time.

  • Mornings85% on time · p90 20 min · 206 flights
  • Middays82% on time · p90 30 min · 1,399 flights
  • Evenings68% on time · p90 70 min · 1,355 flights
  • Afternoons66% on time · p90 50 min · 596 flights
  • Overnights45% on time · p90 100 min · 209 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 70% to 76% on time.

  • Tuesdays76% on time · p90 45 min · 498 flights
  • Saturdays74% on time · p90 50 min · 507 flights
  • Wednesdays73% on time · p90 45 min · 522 flights
  • Mondays73% on time · p90 65 min · 561 flights
  • Sundays72% on time · p90 50 min · 590 flights
  • Thursdays71% on time · p90 60 min · 542 flights
  • Fridays70% on time · p90 75 min · 545 flights
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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.