HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portland

$140+ Cheap flights from Islip, NY to Portland (ISP - PDX)

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 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PDX
Aug 21 — Aug 281
Thu 8/21
Thu 8/28
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Portland 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 Islip to Portland

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Portland (PDX). 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 August 16, 2025.

Round-trip from

$313
(FlightHub)

One-way from

$140
(Frontier)

Popular in

December

Cheapest in

January

Average price

$437
From Islip Long Island to Portland
Search Deals
One-way flight from Islip Long Island to Portland
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Islip to Portland

Cheapest flights from Islip to Portland
Explore the most affordable flight options available from Islip to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 16, 2025.

This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/411:45 amISP - PDX
2 stops33h 42mFrontier
Sun 9/76:05 amPDX - ISP
2 stops25h 35mFrontier
Deal found 8/14$313
This Southwest deal was found by Cheapflights users on 8/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/43:05 pmISP - PDX
2 stops11h 00mSouthwest
Sun 9/79:05 pmPDX - ISP
1 stop11h 55mSouthwest
Deal found 8/14$510
This Expedia deal was found by Cheapflights users on 8/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/292:19 pmISP - PDX
1 stop9h 31mMultiple Airlines
Tue 9/26:51 amPDX - ISP
2 stops14h 08mMultiple Airlines
Deal found 8/14$834
This United deal was found by Cheapflights users on 8/14. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/47:30 amISP - PDX
3 stops18h 12mMultiple Airlines
Sun 9/72:15 pmPDX - ISP
2 stops20h 09mMultiple Airlines
Deal found 8/14$991
This Cheapflightsfares deal was found by Cheapflights users on 8/15. 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.
Mon 11/172:19 pmISP - PDX
1 stop8h 48mMultiple Airlines
Fri 11/218:38 pmPDX - ISP
2 stops11h 20mMultiple Airlines
Deal found 8/15$1,072
This Expedia deal was found by Cheapflights users on 8/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1711:53 amISP - PDX
1 stop11h 31mMultiple Airlines
Thu 8/2112:18 pmPDX - ISP
2 stops20h 58mMultiple Airlines
Deal found 8/15$1,116
This Cheapflightsfares deal was found by Cheapflights users on 8/15. 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 12/302:19 pmISP - PDX
1 stop9h 17mMultiple Airlines
Thu 1/296:00 amPDX - ISP
2 stops11h 01mMultiple Airlines
Deal found 8/15$1,119
This Cheapflightsfares deal was found by Cheapflights users on 8/15. 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 8/292:19 pmISP - PDX
1 stop9h 31mMultiple Airlines
Sat 9/66:05 amPDX - ISP
2 stops10h 56mMultiple Airlines
Deal found 8/15$1,252
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 9/164:33 pmISP - PDX
2 stops10h 42mMultiple Airlines
Wed 9/176:05 amPDX - ISP
2 stops10h 56mMultiple Airlines
Deal found 8/14$1,272
This Cheapflightsfares deal was found by Cheapflights users on 8/15. 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 9/94:33 pmISP - PDX
2 stops10h 42mMultiple Airlines
Wed 9/106:05 amPDX - ISP
2 stops10h 56mMultiple Airlines
Deal found 8/15$1,308
This Southwest deal was found by Cheapflights users on 8/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/176:00 amISP - PDX
2 stops13h 45mSouthwest
Thu 8/219:25 amPDX - ISP
2 stops10h 30mSouthwest
Deal found 8/15$1,332
This Cheapflightsfares deal was found by Cheapflights users on 8/14. 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 10/142:19 pmISP - PDX
1 stop8h 56mMultiple Airlines
Fri 10/178:50 pmPDX - ISP
2 stops11h 08mMultiple Airlines
Deal found 8/14$1,339

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Portland 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 August 16, 2025.
Use the filters below to find and compare flights from Islip to Portland that are best for you.

Fly from

Islip

Fly to

Portland

Route

Depart

Return

Price

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Thu 9/4

11:45 am-6:27 pm

2 stops33h 42m

Portland

Sun 9/7

6:05 am-10:40 am

2 stops25h 35m

$313

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Thu 9/4

6:00 am-4:00 pm

1 stop13h 00m

Portland

Sun 9/7

9:05 pm-12:00 pm

1 stop11h 55m

$510

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Fri 8/29

2:19 pm-8:50 pm

1 stop9h 31m

Portland

Tue 9/2

6:51 am-11:59 pm

2 stops14h 08m

$834

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Thu 9/4

7:30 am-10:42 pm

3 stops18h 12m

Portland

Sun 9/7

2:15 pm-1:24 pm

2 stops20h 09m

$991

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Mon 11/17

2:19 pm-8:07 pm

1 stop8h 48m

Portland

Fri 11/21

8:38 pm-10:58 am

2 stops11h 20m

$1,072

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Tue 12/30

2:19 pm-8:36 pm

1 stop9h 17m

Portland

Thu 1/29

6:00 am-8:01 pm

2 stops11h 01m

$1,119

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Fri 8/29

2:19 pm-8:50 pm

1 stop9h 31m

Portland

Sat 9/6

6:05 am-8:01 pm

2 stops10h 56m

$1,252

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Tue 9/16

4:33 pm-12:15 am

2 stops10h 42m

Portland

Wed 9/17

6:05 am-8:01 pm

2 stops10h 56m

$1,272

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Tue 9/9

4:33 pm-12:15 am

2 stops10h 42m

Portland

Wed 9/10

6:05 am-8:01 pm

2 stops10h 56m

$1,308

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Tue 10/14

2:19 pm-8:15 pm

1 stop8h 56m

Portland

Fri 10/17

8:50 pm-10:58 am

2 stops11h 08m

$1,339

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 18 results
1
2

Best time to book a flight from Islip to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from Islip 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 Islip to Portland

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

Currently, November is the cheapest month in which you can book a flight from Islip, New York to Portland (average of $277). Flying from Islip, New York to Portland in March is currently the most expensive (average of $369). 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.

Related info for your journey

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

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip to Portland 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 Islip, New York to Portland?

    Currently, November is the cheapest month in which you can book a flight from Islip, New York to Portland (average of $277). Flying from Islip, New York to Portland in March is currently the most expensive (average of $369). 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 Portland?

Book flights to Portland if you plan to visit one of these locations
Vancouver
Seaside
Beaverton
Clackamas
McMinnville
Lake Oswego
Hillsboro
Lincoln City
Cannon Beach
Long Beach
Longview
Tigard
Depoe Bay
Stevenson
Woodburn
Wilsonville
Pacific City
Troutdale
Tillamook
Gresham

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 Islip to Portland

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

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.