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$158+ 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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PDX
jul. 5 — jul. 121
sáb. 7/5
sáb. 7/12
1 adult, Economy
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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 junio 30, 2025.

Round-trip from

$427
(Southwest)

One-way from

$158
(Frontier)

Popular in

December

Cheapest in

January

Average price

$487
From Islip Long Island to Portland
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One-way flight from Islip Long Island to Portland
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Highest demand for flights based on searches. 4% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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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 junio 30, 2025.

This Southwest deal was found by Cheapflights users on 6/30. 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.
vie. 9/56:00 amISP - PDX
1 stop13h 00mSouthwest
dom. 9/79:05 pmPDX - ISP
1 stop11h 55mSouthwest
Deal found 6/30$427
This Frontier deal was found by Cheapflights users on 6/29. 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.
lun. 8/258:59 amISP - PDX
2 stops18h 16mFrontier
mié. 9/36:51 amPDX - ISP
2 stops13h 50mFrontier
Deal found 6/29$503
This Mytrip deal was found by Cheapflights users on 6/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/1410:36 amISP - PDX
3 stops25h 42mMultiple Airlines
vie. 7/1810:23 amPDX - ISP
3 stops24h 09mMultiple Airlines
Deal found 6/29$871

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 junio 30, 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

vie. 9/5

6:00 am-4:00 pm

1 stop13h 00m

Portland

dom. 9/7

9:05 pm-12:00 pm

1 stop11h 55m

$427

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

lun. 8/25

8:59 am-12:15 am

2 stops18h 16m

Portland

mié. 9/3

6:51 am-11:41 pm

2 stops13h 50m

$503

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

lun. 7/14

10:36 am-9:18 am

3 stops25h 42m

Portland

vie. 7/18

10:23 am-1:32 pm

3 stops24h 09m

$871

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

mar. 9/2

6:05 am-10:39 pm

2 stops19h 34m

$158

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

mar. 9/2

6:05 am-1:50 pm

1 stop10h 45m

$176

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

mar. 7/15

1:55 pm-9:18 am

3 stops22h 23m

$330

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/28

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.

Reviews of airlines servicing Portland

Get insights into the airlines that provide service to Portland. 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 Portland. Reviews last updated junio 30, 2025.
Peruse reviews from past customers who have flown with Southwest and Frontier from Islip to Portland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,278 reviews

Comfort

8.0

Boarding

8.2

Entertainment

7.6

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,278 reviews
Southwest
8.0
Very good
4,278 reviews

Comfort

8.0

Boarding

8.2

Entertainment

7.6

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Frontier
5.9
Fair
3,290 reviews
Southwest
8.0
Very good
4,278 reviews

Comfort

8.0

Boarding

8.2

Entertainment

7.6

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 Islip?

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

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