What is the cheapest month to fly from Islip to Washington?

Based on current 6-month forward fare data, May 2026 is the cheapest month to fly from Islip (ISP) to Washington (DCA), with fares starting from $329.

What is the lowest current fare from ISP to DCA?

The lowest currently-listed fare from Islip (ISP) to Washington (DCA) is $329 on 2026-05-29.

Is there a direct flight from Islip to Washington?

There is currently no non-stop service from ISP to DCA. Most travellers connect through a hub airport. See our route page for current stopover options.

Cheap flights from Islip to Washington

Cheapest current fares: $329 in May 2026 on connecting flights.

Last updated May 25, 2026 · By Flightmaps Editorial

Cheapest month-by-month fares

Lowest available fare per calendar month from Islip (ISP) to Washington (DCA). Refreshed daily.

Islip (ISP) → Washington (DCA)

May 2026 $329

Frequently asked questions

What is the cheapest month to fly from Islip to Washington?

Based on current 6-month forward fare data, May 2026 is the cheapest month to fly from Islip (ISP) to Washington (DCA), with fares starting from $329.
What is the lowest current fare from ISP to DCA?

The lowest currently-listed fare from Islip (ISP) to Washington (DCA) is $329 on 2026-05-29.
Is there a direct flight from Islip to Washington?

There is currently no non-stop service from ISP to DCA. Most travellers connect through a hub airport. See our route page for current stopover options.

Related guides for this route

Sibling pages — full route detail, airport overviews, visa context, per-airline routes.