OnTimeStats

Historical on-time performance

Nantucket to Boston

91 miData through May 2026Source: US DOT · BTS

Flights on ACK–BOS arrive on time 68% of the time over the last 12 months.

On-time rate68%arrived within 15 min
p90 delay75 min1 in 10 flights is worse (tail risk)
Cancelled2.1%of scheduled flights

based on 193 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • JetBlue Airways
    On-time68%
    Medianon time
    p9075 min
    Cancel2.1%
    Flights193

Why flights run late

Delay causes

  • Airline5%
  • Weather0%
  • Air traffic (NAS)57%
  • Late aircraft39%
  • Security0%

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

When flights don't go

Why flights were cancelled

  • Airline50%
  • Weather25%
  • Air traffic (NAS)25%
  • Security0%

Most cancellations here are attributed to Airline. Shares are among 4 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 ACK → BOS

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 66% to 74% on time.

  • Middays74% on time · p90 75 min · 207 flights
  • Afternoons67% on time · p90 75 min · 296 flights
  • Evenings66% on time · p90 75 min · 122 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 61% to 75% on time.

  • Saturdays75% on time · p90 65 min · 102 flights · limited
  • Sundays64% on time · p90 80 min · 103 flights · limited
  • Fridays61% on time · p90 85 min · 102 flights · limited

Keep exploring

Related pages

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.