$314+ Cheap flights from Portland to Islip, NY (PDX - ISP)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ISP
Oct 24 — Oct 311
Round-trip
1 adult, Economy
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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
Best
One-way
Best flights from Portland to IslipDiscover carefully curated flight deals from Portland to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 24, 2026.
Discover carefully curated flight deals from Portland to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 24, 2026.
This Southwest deal was found by Cheapflights users on 9/21. 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.
Sat 2/206:20 am -
2 stops9h 20m
Sat 2/279:30 am -
2 stops15h 45m
Deal found 9/21![Southwest logo]()
$511
One-way flights from Portland to IslipSearch for one-way flight options from Portland to Islip. Find affordable one-way fares based on user searches. Data last updated September 24, 2026.
Search for one-way flight options from Portland to Islip. Find affordable one-way fares based on user searches. Data last updated September 24, 2026.
This Southwest deal was found by Cheapflights users on 9/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:35 pm -
2 stops13h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Southwest logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 9/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/911:06 am -
3 stops44h 11m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/22![Multiple Airlines logo]()
$404
This Frontier deal was found by Cheapflights users on 9/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/228:54 pm -
2 stops15h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Frontier logo]()
$457
This Frontier deal was found by Cheapflights users on 9/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/271:58 pm -
2 stops22h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$544
This Frontier deal was found by Cheapflights users on 9/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/298:54 pm -
2 stops15h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$862
Find 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 September 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $511 (Southwest) |
One-way from | $314 (Southwest) |
Popular in | December |
Cheapest in | February |
Average price | $408 |
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 7,457,451 searches. Data last updated September 24, 2026.
Use the filters below to find and compare flights from Portland to Islip that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
PortlandIslip
PDX Portland - ISP Islip Long Island
PDXISP
Portland
Fri 10/9
7:35 pm-11:40 am
2 stops13h 05m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$314
PortlandIslip
PDX Portland - ISP Islip Long Island
PDXISP
Portland
Fri 10/9
11:06 am-10:17 am
3 stops44h 11m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$404
PortlandIslip
PDX Portland - ISP Islip Long Island
PDXISP
Portland
Sun 11/22
8:54 pm-3:45 pm
2 stops15h 51m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$457
PortlandIslip
PDX Portland - ISP Islip Long Island
PDXISP
Portland
Sat 2/20
6:20 am-6:40 pm
2 stops9h 20m
Islip Long Island
Sat 2/27
9:30 am-10:15 pm
2 stops15h 45m
$511
PortlandIslip
PDX Portland - ISP Islip Long Island
PDXISP
Portland
Fri 11/27
1:58 pm-3:45 pm
2 stops22h 47m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$544
PortlandIslip
PDX Portland - ISP Islip Long Island
PDXISP
Portland
Sun 11/29
8:54 pm-3:45 pm
2 stops15h 51m
Islip Long Island
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$862
Sorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Portland-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Islip, New York flight deals on Cheapflights vs. FlightHub >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 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 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.
PDX-ISP
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 Portland to Islip. 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 Islip?
Book flights to Islip if you plan to visit one of these locationsRiverhead
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