OnTimeStats

Historical on-time performance

Denver to Boston

1,754 miData through Dec 2025Source: US DOT · BTS

Flights on DEN–BOS arrive on time 71% of the time over the last 12 months.

On-time rate71%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights

based on 3,899 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Too close to call — no single carrier is clearly more on-time here.

  • United Airlines
    On-time75%
    Medianon time
    p9055 min
    Cancel0.1%
    Flights1,969
  • Delta Air Lines
    On-time73%
    Medianon time
    p9045 min
    Cancel0.8%
    Flights387
  • JetBlue Airways
    On-time70%
    Medianon time
    p9070 min
    Cancel0.8%
    Flights650
  • Southwest Airlines
    On-time62%
    Median5 min
    p9080 min
    Cancel0.2%
    Flights893

Why flights run late

Delay causes

  • Airline23%
  • Weather1%
  • Air traffic (NAS)43%
  • Late aircraft32%
  • 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 DEN → BOS

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 — 80% on time.

  • Mornings80% on time · p90 35 min · 2,580 flights
  • Overnights76% on time · p90 55 min · 1,773 flights
  • Middays67% on time · p90 65 min · 3,393 flights
  • Afternoons62% on time · p90 95 min · 1,248 flights
  • Evenings61% on time · p90 70 min · 2,024 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 66% to 73% on time.

  • Saturdays73% on time · p90 50 min · 1,425 flights
  • Wednesdays73% on time · p90 55 min · 1,561 flights
  • Tuesdays71% on time · p90 60 min · 1,505 flights
  • Sundays70% on time · p90 60 min · 1,634 flights
  • Mondays68% on time · p90 75 min · 1,655 flights
  • Fridays67% on time · p90 70 min · 1,655 flights
  • Thursdays66% on time · p90 70 min · 1,631 flights
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Keep exploring

Related pages

Delay predictorfor this route→DEN airportDenver→BOS airportBoston→United Airlines on this routecarrier detail→United Airlinesairline profile→

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.