OnTimeStats

Historical on-time performance

Raleigh-durham to Denver

1,436 miData through Dec 2025Source: US DOT · BTS

Flights on RDU–DEN arrive on time 78% of the time over the last 12 months.

On-time rate78%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights

based on 1,522 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time82%
    Medianon time
    p9035 min
    Cancel0.5%
    Flights817
  • Southwest Airlines
    On-time73%
    Medianon time
    p9050 min
    Cancel0.1%
    Flights705

Why flights run late

Delay causes

  • Airline21%
  • Weather2%
  • Air traffic (NAS)41%
  • Late aircraft36%
  • Security0%

Most delay minutes here are attributed to Air traffic (NAS).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly RDU → DEN

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 62% to 88% on time.

  • Mornings88% on time · p90 15 min · 2,410 flights
  • Middays86% on time · p90 20 min · 628 flights
  • Afternoons74% on time · p90 45 min · 1,360 flights
  • Overnights72% on time · p90 60 min · 336 flights
  • Evenings62% on time · p90 75 min · 1,031 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 77% to 82% on time.

  • Sundays82% on time · p90 30 min · 841 flights
  • Wednesdays81% on time · p90 35 min · 796 flights
  • Tuesdays79% on time · p90 35 min · 809 flights
  • Saturdays79% on time · p90 35 min · 768 flights
  • Mondays78% on time · p90 40 min · 853 flights
  • Thursdays77% on time · p90 40 min · 849 flights
  • Fridays77% on time · p90 50 min · 849 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.