HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$448+ Cheap flights from Portland to Islip, NY (PDX - ISP)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ISP
Dec 24 — Dec 311
Wed 12/24
Wed 12/31
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to Islip with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Portland to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Islip (ISP). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 24, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Popular in

December

Cheapest in

February

Average price

$437
Provider with most accurate pricing for Portland-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Islip Long Island flights.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Find flight deals from Portland to Islip

One-way flights from Portland to Islip
Search for one-way flight options from Portland to Islip. Find affordable one-way fares based on user searches. Data last updated November 24, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 11/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/36:00 amPDX - ISP
2 stops10h 45mMultiple Airlines
Deal found 11/22$448
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/66:14 amPDX - ISP
2 stops10h 31mMultiple Airlines
Deal found 11/23$468
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/248:32 pmPDX - ISP
2 stops11h 33mMultiple Airlines
Deal found 11/23$537
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/186:00 amPDX - ISP
2 stops10h 45mMultiple Airlines
Deal found 11/23$594
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:00 amPDX - ISP
2 stops10h 45mMultiple Airlines
Deal found 11/23$604
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/38:44 pmPDX - ISP
2 stops11h 20mMultiple Airlines
Deal found 11/23$621
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:32 pmPDX - ISP
2 stops11h 33mMultiple Airlines
Deal found 11/23$624
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/136:00 amPDX - ISP
2 stops10h 45mMultiple Airlines
Deal found 11/23$665
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:32 pmPDX - ISP
2 stops11h 33mMultiple Airlines
Deal found 11/23$681
This Cheapflightsfares deal was found by Cheapflights users on 11/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:32 pmPDX - ISP
2 stops11h 33mMultiple Airlines
Deal found 11/23$683
This Cheapflightsfares deal was found by Cheapflights users on 11/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/146:00 amPDX - ISP
2 stops10h 45mMultiple Airlines
Deal found 11/22$688

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to Islip that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 24, 2025.
Use the filters below to find and compare flights from Portland to Islip that are best for you.

Fly from

Portland

Fly to

Islip

Route

Depart

Return

Price

PortlandIslip

PDX - ISP

PDXISP

Portland

Tue 2/3

6:00 am-7:45 pm

2 stops10h 45m

$448

PortlandIslip

PDX - ISP

PDXISP

Portland

Tue 1/6

6:14 am-7:45 pm

2 stops10h 31m

$468

PortlandIslip

PDX - ISP

PDXISP

Portland

Wed 3/25

6:00 am-7:45 pm

2 stops10h 45m

$537

PortlandIslip

PDX - ISP

PDXISP

Portland

Mon 1/5

8:32 pm-11:05 am

2 stops11h 33m

$537

PortlandIslip

PDX - ISP

PDXISP

Portland

Fri 1/9

6:00 am-7:45 pm

2 stops10h 45m

$537

PortlandIslip

PDX - ISP

PDXISP

Portland

Wed 12/24

8:32 pm-11:05 am

2 stops11h 33m

$537

PortlandIslip

PDX - ISP

PDXISP

Portland

Tue 3/24

6:00 am-7:45 pm

2 stops10h 45m

$604

PortlandIslip

PDX - ISP

PDXISP

Portland

Fri 12/5

8:44 pm-11:04 am

2 stops11h 20m

$621

PortlandIslip

PDX - ISP

PDXISP

Portland

Sun 1/18

6:00 am-7:45 pm

2 stops10h 45m

$621

PortlandIslip

PDX - ISP

PDXISP

Portland

Wed 12/3

8:44 pm-11:04 am

2 stops11h 20m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/22

Showing 1-10 of 11 results
1
2

Compare providers for flights from Portland to Islip

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Islip in November.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland-Islip, New York flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Portland-Islip, New York flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Portland-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland-Islip, New York flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-Islip, New York flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Portland to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Portland with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Portland to Islip

What is the cheapest month to book a flight from Portland to Islip, New York?

Currently, February is the cheapest month in which you can book a flight from Portland to Islip, New York (average of $103). Flying from Portland to Islip, New York in October is currently the most expensive (average of $257). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Islip. Reviews last updated November 24, 2025.
Read through reviews of airlines operating flights from Portland to Islip, such as Southwest. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,252 reviews

Overall

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,252 reviews
Southwest
8.0
Very good
4,252 reviews

Overall

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Portland to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What is the cheapest airline to fly from Portland to Islip, New York round-trip?

    Currently priced at $361, Southwest will fly you from Portland to Islip, New York and back. In addition to Southwest, many other airlines offer competitively priced options for your trip.

  • Can I find deals for flights from Portland to Islip that include hotel bookings?

    Yes. In addition to deals on Portland to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Islip?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Islip.

  • Can I find deals for business class flights from Portland to Islip?

    Yes. Cheapflights offers flight deals from Portland to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portland to Islip, New York?

    Currently, February is the cheapest month in which you can book a flight from Portland to Islip, New York (average of $103). Flying from Portland to Islip, New York in October is currently the most expensive (average of $257). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to Islip

See prices for flight routes from nearby airports that may be better suited for you.
Portland to John F Kennedy Intl flights
Portland to Newark flights
Portland to LaGuardia flights
Boise to John F Kennedy Intl flights
Boise to Newark flights
Boise to LaGuardia flights
Redmond to John F Kennedy Intl flights
Portland to Buffalo flights
Eugene to John F Kennedy Intl flights
Eugene to Newark flights
Redmond to Newark flights
Eugene to LaGuardia flights
Portland to White Plains flights
Boise to White Plains flights
Redmond to LaGuardia flights
Boise to Syracuse flights
Portland to Rochester flights
Boise to Buffalo flights
Boise to Rochester flights
Portland to Ithaca flights
Redmond to Buffalo flights
Medford to Newark flights
Portland to Albany flights
Portland to Syracuse flights
Medford to John F Kennedy Intl flights
Medford to LaGuardia flights
Boise to Albany flights
Yakima to John F Kennedy Intl flights
Eugene to Buffalo flights
Medford to Buffalo flights
Yakima to Newark flights
Eugene to Albany flights
Eugene to Ithaca flights
Eugene to Rochester flights
Medford to White Plains flights
Redmond to Binghamton flights
Boise to Elmira flights
Eugene to Syracuse flights
Portland to Binghamton flights
Redmond to Albany flights
Eugene to White Plains flights
Boise to Islip flights
Redmond to White Plains flights
Medford to Rochester flights
Redmond to Syracuse flights
Redmond to Elmira flights
Redmond to Ithaca flights
Medford to Syracuse flights
Boise to Binghamton flights
North Bend to Newark flights

Top airline flying from Portland to Islip

Discover the top airline that operate flights from Portland to Islip. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$361Average$437FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.