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Flights from Portland to Islip

Find the cheapest flight options from Portland to Islip over the next three months. Book one-way tickets from CAD 214 and round-trip tickets from CAD 616.

      • PWM 16:35
        18h 50m
        1 stop
        ISP 11:25
        Portland - Islip | Wed, Dec 17 | Jetblue Airways
        ISP 14:04
        25h 21m
        1 stop
        PWM 15:25
        Islip - Portland | Sun, Dec 21 | Frontier Airlines
        CAD 616 CAD 716
        14% OFF
        14% OFF
        CAD 716 CAD 616
      • PWM 13:00
        17h 25m
        1 stop
        ISP Invalid Date
        Portland - Islip | Mon, Dec 15 | Normal Airline
        ISP 15:00
        6h
        Direct
        PWM 16:00
        Islip - Portland | Wed, Dec 17 | Normal Airline
        Find More Flights
        Find More Flights
      • PWM 16:29
        26h 45m
        1 stop
        ISP 19:14
        Portland - Islip | Mon, Dec 15 | Jetblue Airways
        CAD 214 CAD 267
        20% OFF
        20% OFF
        CAD 267 CAD 214
      • PWM 15:45
        22h 54m
        1 stop
        ISP 14:39
        Portland - Islip | Wed, Jan 7 | Jetblue Airways
        CAD 230 CAD 267
        14% OFF
        14% OFF
        CAD 267 CAD 230
      • PWM 13:00
        17h 25m
        1 stop
        ISP Invalid Date
        Portland - Islip | Mon, Dec 15 | Normal Airline
        Find More Flights
        Find More Flights

Displayed flight fares from Portland to Islip are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight details for Portland to Islip

The distance between Portland and Islip is 391.5km. Based on Trip.com's data, travel demand peaks in September. The off-season for travel is August.

Cheapest one-way flight priceCAD 214
Cheapest return ticket priceCAD 616
Off-season travel monthAugust
Peak season for travelSeptember
Flight distance391.5km

Find the best time to fly from Portland to Islip

The cheapest time for Portland to Islip flights: Jan 4 to Jan 11 — one way flight prices from CAD 176.

Cheapest flights
From price
Search
  • 714
  • 1421
  • 2128

  • Jan

    284
  • 411
  • 1118
  • 1825

  • Feb

    251
  • 18
  • 815
  • 1522

  • Mar

    221
Displayed fare trends are based on Trip.com's aggregated average of the lowest flight prices from Portland to Islip, calculated over the upcoming 10 weeks.

Flight FAQs

  • Which airlines offer the cheapest flights from Portland (PWM) to Islip (ISP)?

    Based on Trip.com data, Jetblue Airways offers one-way fares as low as CAD 214 on Cheapest nonstop routes (e.g. PWM to ISP on Mon, Dec 15), while Jetblue Airways offers Cheapest nonstop round-trips from CAD 616 departing on Wed, Dec 17 and returning on Sun, Dec 21.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Portland to Islip is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Portland to Islip, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Dec 15, with one-way flights priced at just CAD 214.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Jetblue Airways.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Islip travel is around September.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Portland to Islip is August, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Portland to Islip on December 17, 2025 with Jetblue Airways, with prices starting at CAD 615.
  • The time difference between Islip and Portland is 0h.
  • Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

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