OnTimeStats

Airport on-time performance

Boston

Data through May 2026Source: US DOT · BTS
On-time rate73%flights departing here that arrived on time
p90 delay55 min1 in 10 departures is worse (tail risk)
Cancelled2.6%of scheduled departures
Left the gate on time77%departures that pushed back within 15 min of schedule (DepDel15)

based on 142,771 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

As a connection hub

Arriving here (inbound performance)

These figures reflect inbound flights arriving at this airport — relevant for connections and layovers.

71%arrived on time here
(within 15 min, inbound flights)
  • On time71%
  • 15–59 min late15%
  • 1–2 hr late7%
  • 2 hr+ late4%
  • Cancelled or diverted3%

Arrival outcomes for inbound flights. Last segment = cancelled or diverted.

Bad day: 1 in 10 flights arrives more than 65 min late.

By airline

Carriers departing here (last 12 months)

Delay = arrival delay (ArrDel15-based)

  • United Airlines
    On-time77%
    Medianon time
    p9045 min
    Cancel1.9%
    Flights12,810
  • Envoy Air
    On-time76%
    Medianon time
    p9060 min
    Cancel1.8%
    Flights1,311
  • American Airlines
    On-time76%
    Medianon time
    p9055 min
    Cancel2.6%
    Flights16,688
  • Delta Air Lines
    On-time75%
    Medianon time
    p9050 min
    Cancel1.9%
    Flights25,632
  • Republic Airways
    On-time74%
    Medianon time
    p9050 min
    Cancel4.0%
    Flights32,094
  • Southwest Airlines
    On-time71%
    Medianon time
    p9055 min
    Cancel1.6%
    Flights6,794
  • JetBlue Airways
    On-time70%
    Medianon time
    p9065 min
    Cancel2.3%
    Flights36,020
  • Alaska Airlines
    On-time69%
    Medianon time
    p9045 min
    Cancel1.1%
    Flights2,436
  • Frontier Airlines
    On-time62%
    Medianon time
    p9050 min
    Cancel2.7%
    Flights258
  • Spirit Airlines
    On-time61%
    Medianon time
    p9095 min
    Cancel4.4%
    Flights1,914

Over time

On-time trend

By season

On-time rate by month

When it gets busy

Busiest times at BOS

Historically, departures at BOS peak 5–10 a.m. — 36% of scheduled flights leave in that block.

  • 5–10 a.m.36%
  • 10 a.m.–2 p.m.21%
  • 2–5 p.m.17%
  • 5–8 p.m.19%
  • 8 p.m.–midnight7%

Share of 426,714 scheduled departures by planned departure time, 2023-06 .. 2026-05. Historical averages from BTS data — not live airport status.

When flights don't go

Why flights were cancelled

  • Airline21%
  • Weather51%
  • Air traffic (NAS)28%
  • Security0%

Most cancellations here are attributed to Weather. Shares are among 3,715 cancellations with a reported cause (BTS reports causes from June 2003).

Where flights go

Busiest routes

BOS → LGA→BOS → DCA→BOS → ORD→BOS → PHL→BOS → JFK→BOS → ATL→BOS → BWI→BOS → EWR→BOS → CLT→BOS → MCO→

Side by side

Compare this airport

Compare with Hartsfield Jackson Atlanta International Airporthead-to-head on-time→Compare with Chicago O'Hare International Airporthead-to-head on-time→Compare with Dallas Fort Worth International Airporthead-to-head on-time→Compare with Denver International Airporthead-to-head on-time→

Will you make a connection at BOS? →

Keep exploring

Related guides

When to arrive at the airportguide→Worst airports for delaysguide→

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.