$212+ 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 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PDX
Sep 4 — Sep 111
Round-trip
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
Cheapest
Best
Last-minute
One-way
Cheapest flights from Islip to PortlandExplore 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 5, 2026.
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 5, 2026.
This Southwest deal was found by Cheapflights users on 8/4. 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.
Tue 9/16:05 am -
1 stop7h 35m
Tue 9/811:30 pm -
2 stops9h 40m
Deal found 8/4![Southwest logo]()
$352
This Southwest deal was found by Cheapflights users on 8/2. 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 9/1012:35 pm -
2 stops11h 10m
Thu 9/177:00 pm -
2 stops11h 40m
Deal found 8/2![Southwest logo]()
$390
This United deal was found by Cheapflights users on 8/4. 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.
Tue 9/17:31 am -
3 stops31h 29m
Tue 9/811:02 pm -
2 stops15h 39m
Deal found 8/4![Multiple Airlines logo]()
$1,040
This United deal was found by Cheapflights users on 8/4. 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.
Tue 9/17:31 am -
3 stops29h 40m
Wed 9/97:15 pm -
2 stops22h 00m
Deal found 8/4![Multiple Airlines logo]()
$1,070
Best flights from Islip to PortlandDiscover carefully curated flight deals from Islip to Portland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 5, 2026.
Discover carefully curated flight deals from Islip to Portland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 5, 2026.
This Southwest deal was found by Cheapflights users on 8/2. 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 9/1012:35 pm -
2 stops11h 10m
Thu 9/1710:45 pm -
1 stop7h 55m
Deal found 8/2![Southwest logo]()
$352
This Southwest deal was found by Cheapflights users on 8/4. 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.
Tue 9/16:05 am -
1 stop7h 35m
Tue 9/811:30 pm -
2 stops9h 40m
Deal found 8/4![Southwest logo]()
$352
This United deal was found by Cheapflights users on 8/4. 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.
Tue 9/17:31 am -
3 stops31h 29m
Tue 9/811:02 pm -
2 stops15h 39m
Deal found 8/4![Multiple Airlines logo]()
$1,040
Last-minute flights from Islip to PortlandDiscover last-minute flight deals from Islip to Portland. Data last updated August 5, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to Portland. Data last updated August 5, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 8/4. 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.
Tue 9/16:05 am -
1 stop7h 35m
Tue 9/811:30 pm -
2 stops9h 40m
Deal found 8/4![Southwest logo]()
$352
This United deal was found by Cheapflights users on 8/4. 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.
Tue 9/17:31 am -
3 stops31h 29m
Tue 9/811:02 pm -
2 stops15h 39m
Deal found 8/4![Multiple Airlines logo]()
$1,040
This United deal was found by Cheapflights users on 8/4. 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.
Tue 9/17:31 am -
3 stops29h 40m
Wed 9/97:15 pm -
2 stops22h 00m
Deal found 8/4![Multiple Airlines logo]()
$1,070
This Southwest deal was found by Cheapflights users on 8/2. 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 9/1012:35 pm -
2 stops11h 10m
Thu 9/177:00 pm -
2 stops11h 40m
Deal found 8/2![Southwest logo]()
$390
One-way flights from Islip to PortlandSearch for one-way flight options from Islip to Portland. Find affordable one-way fares based on user searches. Data last updated August 5, 2026.
Search for one-way flight options from Islip to Portland. Find affordable one-way fares based on user searches. Data last updated August 5, 2026.
This Southwest deal was found by Cheapflights users on 8/4. 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.
Mon 9/286:10 am -
1 stop11h 50m
Deal found 8/4![Southwest logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:46 pm -
2 stops49h 18m
Deal found 8/3![Multiple Airlines logo]()
$425
This Southwest deal was found by Cheapflights users on 8/3. 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 8/1310:20 am -
1 stop7h 40m
Deal found 8/3![Southwest logo]()
$494
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:52 am -
3 stops48h 56m
Deal found 8/4![Multiple Airlines logo]()
$574
Find 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 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $352 (Southwest) |
One-way from | $212 (Southwest) |
Popular in | December |
Cheapest in | February |
Average price | $466 |
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 5, 2026.
Use the filters below to find and compare flights from Islip to Portland that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
IslipPortland
ISP - PDX
ISPPDX
Islip Long Island
Thu 9/10
12:35 pm-8:45 pm
2 stops11h 10m
Portland
Thu 9/17
10:45 pm-9:40 am
1 stop7h 55m
$352
Quickest round-trip
IslipPortland
ISP - PDX
ISPPDX
Islip Long Island
Tue 9/1
6:05 am-10:40 am
1 stop7h 35m
Portland
Tue 9/8
11:30 pm-12:10 pm
2 stops9h 40m
$352
IslipPortland
ISP - PDX
ISPPDX
Islip Long Island
Tue 9/1
7:31 am-12:00 pm
3 stops31h 29m
Portland
Tue 9/8
11:02 pm-5:41 pm
2 stops15h 39m
$1,040
Cheapest one-way
IslipPortland
ISP - PDX
ISPPDX
Islip Long Island
Mon 9/28
6:10 am-3:00 pm
1 stop11h 50m
$212
Quickest one-way
IslipPortland
ISP - PDX
ISPPDX
Islip Long Island
Thu 8/13
10:20 am-3:00 pm
1 stop7h 40m
$494
IslipPortland
ISP - PDX
ISPPDX
Islip Long Island
Mon 9/28
11:52 am-9:48 am
3 stops48h 56m
$574
Sorted by cheapest first
- Most accurate provider: When it comes to deals on Islip, New York-Portland flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Portland flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-Portland flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Islip, New York-Portland flights, Cheapflights users trust FlightHub the most. FlightHub 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 Islip, New York-Portland 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 Islip to Portland
Have a flexible travel schedule? Discover the best time to fly to Portland from Islip with our price prediction graph.
ISP-PDX
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.
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.
Traveling to a place near Portland?
Book flights to Portland if you plan to visit one of these locationsBeaverton
Seaside
Lincoln City
Durham
Longview
Lake Oswego
Hillsboro
Vancouver
Kelso
Clackamas
Troutdale
Cannon Beach
McMinnville
The Dalles
Wilsonville
Stevenson
Tillamook
Astoria
Gresham
Silverton
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
Complete your trip
Flights by cabin class
Other flight options
Other flights from Islip
Popular flights
Portland flight routes