Boston (BOS) to Islip (ISP)
Flight time
≈ 1h 06m
Bearing
226° SW
Boston (BOS) to Islip (ISP) is 153 miles (246 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies BOS–ISP
Filed traffic dataIn June 2026, Cape Air was the only carrier flying nonstop BOS–ISP; the Cessna C-402 was the most common aircraft at 100% of departures; flights ran 53% full.
Departures
191
June 2026
Seats
1,719
both directions
Passengers
905
both directions
Load factor
52.6%
RPM ÷ ASM
Who flies BOS–ISP?
Cape Air was the only carrier to fly nonstop BOS–ISP in June 2026 (191 departures).
- 9K
Cape Air
191 departures · 1,719 seats
Share of departures100.0%52.6%
Load
What plane flies BOS–ISP?
In June 2026, the Cessna C-402 flew 100% of BOS–ISP departures.
- Cessna C-402
191 departures · 52.6% load
100.0%
How has BOS–ISP traffic changed?
Nonstop BOS–ISP departures fell from 223 in July 2025 to 191 in June 2026.
Monthly nonstop BOS–ISP traffic, trailing 12 months through June 2026. Bars scale to the busiest month; months with no filed service show as zero.
July 2025
223 departures · 901 passengers
44.9%
Load
August 2025
249 departures · 1,121 passengers
50.0%
Load
September 2025
216 departures · 802 passengers
41.3%
Load
October 2025
181 departures · 633 passengers
38.9%
Load
November 2025
150 departures · 407 passengers
30.1%
Load
December 2025
161 departures · 594 passengers
37.4%
Load
January 2026
157 departures · 318 passengers
22.5%
Load
February 2026
47 departures · 131 passengers
31.0%
Load
March 2026
58 departures · 215 passengers
41.2%
Load
April 2026
70 departures · 254 passengers
40.3%
Load
May 2026
188 departures · 786 passengers
43.1%
Load
June 2026
191 departures · 905 passengers
52.6%
Load
By direction
Each direction is filed separately — they rarely match.
BOS → ISP
54.4% full
96 departures · 470 passengers
ISP → BOS
50.9% full
95 departures · 435 passengers
Nonstop BOS–ISP traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through June 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Boston (BOS) from Islip (ISP)?
BOS to ISP is 153 miles (246 km / 133 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from BOS to ISP?
A nonstop covers the 153-mile great-circle distance in roughly 1h 06m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies BOS–ISP?
In June 2026, the Cessna C-402 flew the largest share of departures (100.0%).
What mileage do I earn flying BOS–ISP?
Distance-based programs credit off the 153-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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