FFL Helper
Islip ISP
$238
BUF → ISP · Frontier Airlines
FFL Helper / Buffalo / Islip / September 2026
BUF → ISP · 2026-09
Buffalo to Islip in September 2026
Dated one-way fares from Buffalo to Islip in September 2026. Use the calendar to see which days are cheaper.
Lowest this month
$238
Highest this month
$238
Sample fare
$238
Airports
BUF–ISP
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Other months: August 2026 · September 2026 · Full route
September 2026 price calendar
September 2026
From $238
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$238
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Dated fares
Booking BUF to ISP in September 2026
This page is only September 2026 on the Buffalo to Islip route. Open the full route if you want the next months side by side.
Prices move as seats sell. Confirm the live itinerary before you book Buffalo to Islip in September 2026.