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Cheap flights from Islip, New York to Portland from $199

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to Portland departing on 8/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Islip, New York to Portland

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
3:10 pm - 12:10 amISP  Islip Long Island-PDX Portland
12h 00m2 stops Baltimore/Washington Chicago Midway
Southwest Logo
11:35 pm - 2:30 pmPDX  Portland-ISP Islip Long Island
11h 55m2 stops Chicago Midway Baltimore/Washington
$317Southwest
Mon, Oct 19 - Wed, Oct 21
Frontier Logo
10:57 am - 12:52 pmISP  Islip Long Island-PDX Portland
28h 55m2 stops Orlando Las Vegas Harry Reid Intl
Frontier Logo
5:56 pm - 6:14 pmPDX  Portland-ISP Islip Long Island
21h 18m2 stops Denver Intl Orlando
$368Frontier
Wed, Aug 26 - Wed, Sep 2
Southwest Logo
12:55 pm - 8:45 pmISP  Islip Long Island-PDX Portland
10h 50m2 stops Baltimore/Washington San Jose
Southwest Logo
10:45 pm - 9:40 amPDX  Portland-ISP Islip Long Island
7h 55m1 stop Baltimore/Washington
$397Southwest
Wed, Sep 23 - Sun, Sep 27
Southwest Logo
3:20 pm - 11:15 pmISP  Islip Long Island-PDX Portland
10h 55m2 stops Baltimore/Washington Chicago Midway
Southwest Logo
11:30 pm - 12:35 pmPDX  Portland-ISP Islip Long Island
10h 05m2 stops Chicago Midway Baltimore/Washington
$402Southwest
Wed, Sep 23 - Sun, Sep 27
Frontier Logo
5:43 pm - 11:54 amISP  Islip Long Island-PDX Portland
21h 11m2 stops Orlando Las Vegas Harry Reid Intl
Frontier Logo
12:38 pm - 4:58 pmPDX  Portland-ISP Islip Long Island
25h 20m2 stops Denver Intl Orlando
$426Frontier
Thu, Sep 10 - Thu, Sep 17
Southwest Logo
6:05 am - 10:40 amISP  Islip Long Island-PDX Portland
7h 35m1 stop Baltimore/Washington
Southwest Logo
10:45 pm - 9:40 amPDX  Portland-ISP Islip Long Island
7h 55m1 stop Baltimore/Washington
$473Southwest
Wed, Aug 26 - Wed, Sep 2
Southwest Logo
6:05 am - 10:40 amISP  Islip Long Island-PDX Portland
7h 35m1 stop Baltimore/Washington
Southwest Logo
10:45 pm - 9:40 amPDX  Portland-ISP Islip Long Island
7h 55m1 stop Baltimore/Washington
$477Southwest
Wed, Sep 23 - Sun, Sep 27
Southwest Logo
12:55 pm - 8:40 pmISP  Islip Long Island-PDX Portland
10h 45m2 stops Baltimore/Washington San Jose
Southwest Logo
10:45 pm - 9:40 amPDX  Portland-ISP Islip Long Island
7h 55m1 stop Baltimore/Washington
$479Southwest
Wed, Aug 26 - Wed, Sep 2
Southwest Logo
12:35 pm - 8:45 pmISP  Islip Long Island-PDX Portland
11h 10m2 stops Baltimore/Washington Chicago Midway
Southwest Logo
10:45 pm - 9:40 amPDX  Portland-ISP Islip Long Island
7h 55m1 stop Baltimore/Washington
$482Southwest
Thu, Sep 10 - Sun, Sep 13
Southwest Logo
12:35 pm - 8:45 pmISP  Islip Long Island-PDX Portland
11h 10m2 stops Baltimore/Washington Chicago Midway
Southwest Logo
8:00 pm - 9:40 amPDX  Portland-ISP Islip Long Island
10h 40m2 stops Las Vegas Harry Reid Intl Baltimore/Washington
$487Southwest
Thu, Sep 10 - Sun, Sep 13

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Southwest flights from Islip, New York to Portland

Our best Southwest deals on Islip, New York to Portland flight tickets
Southwest
Oct 19
ISP3:10 pmIslip Long Island
12h 00m
2 stops
PDX12:10 amPortland
Oct 21
PDX11:35 pmPortland
11h 55m
2 stops
ISP2:30 pmIslip Long Island
$317
Southwest
Sep 23
ISP12:55 pmIslip Long Island
10h 50m
2 stops
PDX8:45 pmPortland
Sep 27
PDX10:45 pmPortland
7h 55m
1 stop
ISP9:40 amIslip Long Island
$397
Southwest
Sep 23
ISP3:20 pmIslip Long Island
10h 55m
2 stops
PDX11:15 pmPortland
Sep 27
PDX11:30 pmPortland
10h 05m
2 stops
ISP12:35 pmIslip Long Island
$402

Frontier flights from Islip, New York to Portland

Our best Frontier deals on Islip, New York to Portland flight tickets
Frontier
Aug 26
ISP10:57 amIslip Long Island
28h 55m
2 stops
PDX12:52 pmPortland
Sep 2
PDX5:56 pmPortland
21h 18m
2 stops
ISP6:14 pmIslip Long Island
$368
Frontier
Sep 10
ISP5:43 pmIslip Long Island
21h 11m
2 stops
PDX11:54 amPortland
Sep 17
PDX12:38 pmPortland
25h 20m
2 stops
ISP4:58 pmIslip Long Island
$426

momondo Fare Finder

 
Customize your flight search to find flights from Islip, New York 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, momondo users made 832,500 searches. Data last updated August 13, 2026.
Use the filters below to find and compare flights from Islip, New York to Portland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Mon 10/19

3:10 pm-12:10 am

2 stops12h 00m

Portland

Wed 10/21

11:35 pm-2:30 pm

2 stops11h 55m

$317

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Wed 8/26

10:57 am-12:52 pm

2 stops28h 55m

Portland

Wed 9/2

5:56 pm-6:14 pm

2 stops21h 18m

$368

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Wed 9/23

12:55 pm-8:45 pm

2 stops10h 50m

Portland

Sun 9/27

10:45 pm-9:40 am

1 stop7h 55m

$397

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Wed 9/23

3:20 pm-11:15 pm

2 stops10h 55m

Portland

Sun 9/27

11:30 pm-12:35 pm

2 stops10h 05m

$402

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Thu 9/10

5:43 pm-11:54 am

2 stops21h 11m

Portland

Thu 9/17

12:38 pm-4:58 pm

2 stops25h 20m

$426
Quickest round-trip

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Wed 8/26

6:05 am-10:40 am

1 stop7h 35m

Portland

Wed 9/2

10:45 pm-9:40 am

1 stop7h 55m

$473

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Wed 9/23

6:05 am-10:40 am

1 stop7h 35m

Portland

Sun 9/27

10:45 pm-9:40 am

1 stop7h 55m

$477

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Wed 8/26

12:55 pm-8:40 pm

2 stops10h 45m

Portland

Wed 9/2

10:45 pm-9:40 am

1 stop7h 55m

$479

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Thu 9/10

12:35 pm-8:45 pm

2 stops11h 10m

Portland

Sun 9/13

10:45 pm-9:40 am

1 stop7h 55m

$482

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Thu 9/10

12:35 pm-8:45 pm

2 stops11h 10m

Portland

Sun 9/13

8:00 pm-9:40 am

2 stops10h 40m

$487

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Islip, New York to Portland

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Portland?

The cheapest day to depart on your flight to Portland is on a Wednesday when prices can be found for as low as $405. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Portland is Monday, with ticket prices averaging around $512.

What is the cheapest time of day to depart on your flight to Portland?

The cheapest time of day to fly to Portland is in the morning when flights can be purchased for as low as $431. In the evening is when there is more demand to fly to Portland, so prices are often more expensive at around $517 per ticket.

Can stopping save me money on Islip, New York to Portland flights?

You could potentially save up to 26% on your flight if you consider stops on a Islip, New York to Portland flight.

When to book flights from Islip, New York to Portland

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Portland according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Islip, New York to Portland (ISP to PDX) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Portland

Fastest flight time

7h 35m

Direct flights

None
The fastest flight from Islip, New York to Portland takes 7h 35m
There are no direct flights from Islip, New York to Portland. There are no popular flight routes from Islip, New York to Portland.
Search flight deals

Frequently asked questions about flying from Islip, New York to Portland

  • How far is Islip Long Island to Portland by plane?

    The distance between Islip Long Island and Portland is about 2474.8 mi. A reasonable flight in good conditions will take 7h 35m.

  • When did momondo last update prices for flights from Islip Long Island Airport to Portland Airport?

    Prices for flights from Islip Long Island Airport to Portland Airport were last updated today.

  • How old do you have to be to fly from Islip Long Island Airport to Portland Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Portland Airport.

  • What documentation or ID do you need to fly to Portland Airport?

    The required travel and health documents for your Portland Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Portland Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Lincoln City
Seaside
Vancouver
Cannon Beach
Salem
Astoria
Long Beach
Beaverton
Rockaway Beach
Hillsboro
Tigard
Depoe Bay
Longview
Hood River
Newberg
Clackamas
Troutdale
Gresham
Kelso
Wilsonville

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Portland?

Finding the right flight to Portland from Islip is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Portland quick and easy, saving you time and money.

Can I find flights from Islip to Portland with flexible booking policies on momondo?

Yes. All flights to Portland from Islip on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Islip to Portland?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Portland from Islip.

I’m not ready to book a flight from Islip to Portland right now. Can momondo alert me if prices change?

Price alerts on flights to Portland from Islip are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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