OnTimeStats

Historical on-time performance

Denver to Baltimore

1,491 miData through Dec 2025Source: US DOT · BTS

Flights on DEN–BWI arrive on time 74% of the time over the last 12 months.

On-time rate74%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights

based on 2,949 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time77%
    Medianon time
    p9035 min
    Cancel0.5%
    Flights981
  • Southwest Airlines
    On-time73%
    Medianon time
    p9040 min
    Cancel1.2%
    Flights1,968

Why flights run late

Delay causes

  • Airline31%
  • Weather2%
  • Air traffic (NAS)22%
  • Late aircraft46%
  • 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 → BWI

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

Best time of day

Mornings are the most reliable time of day to fly this route — 87% on time.

  • Mornings87% on time · p90 15 min · 3,295 flights
  • Overnights78% on time · p90 35 min · 780 flights
  • Middays76% on time · p90 30 min · 1,405 flights
  • Early mornings70% on time · p90 55 min · 127 flights · limited
  • Afternoons61% on time · p90 50 min · 1,204 flights
  • Evenings59% on time · p90 70 min · 2,309 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 72% to 76% on time.

  • Wednesdays76% on time · p90 35 min · 1,311 flights
  • Tuesdays75% on time · p90 40 min · 1,273 flights
  • Saturdays74% on time · p90 40 min · 1,133 flights
  • Fridays74% on time · p90 40 min · 1,390 flights
  • Mondays73% on time · p90 40 min · 1,392 flights
  • Thursdays73% on time · p90 45 min · 1,335 flights
  • Sundays72% on time · p90 45 min · 1,286 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.