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Cheap flights from Islip, New York to Portland from $418

This is the cheapest round-trip 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 9/5. 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.
Frontier Logo
7:09 pm - 12:52 pmISP  Islip Long Island-PDX Portland
20h 43m2 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
$418Frontier
Sat, Sep 5 - Thu, Sep 10
Southwest Logo
4:20 pm - 11:05 pmISP  Islip Long Island-PDX Portland
9h 45m2 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
$433Southwest
Tue, Oct 13 - Sun, Oct 18
Southwest Logo
10:20 am - 3:00 pmISP  Islip Long Island-PDX Portland
7h 40m1 stop Baltimore/Washington
Southwest Logo
10:45 pm - 9:40 amPDX  Portland-ISP Islip Long Island
7h 55m1 stop Baltimore/Washington
$434Southwest
Fri, Sep 25 - Sun, Sep 27
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
$439Southwest
Fri, Sep 25 - Sun, Sep 27
Southwest Logo
12:35 pm - 8:45 pmISP  Islip Long Island-PDX Portland
11h 10m2 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
$444Southwest
Fri, Sep 25 - Sun, Sep 27
Southwest Logo
10:20 am - 3:00 pmISP  Islip Long Island-PDX Portland
7h 40m1 stop Baltimore/Washington
Southwest Logo
5:50 am - 9:05 pmPDX  Portland-ISP Islip Long Island
12h 15m2 stops Las Vegas Harry Reid Intl Baltimore/Washington
$493Southwest
Fri, Aug 28 - Tue, Sep 1
Southwest Logo
12:35 pm - 9:15 pmISP  Islip Long Island-PDX Portland
11h 40m2 stops Baltimore/Washington Denver Intl
Southwest Logo
5:50 am - 9:05 pmPDX  Portland-ISP Islip Long Island
12h 15m2 stops Las Vegas Harry Reid Intl Baltimore/Washington
$498Southwest
Fri, Aug 28 - Tue, Sep 1
Southwest Logo
5:30 am - 12:30 pmISP  Islip Long Island-PDX Portland
10h 00m1 stop Baltimore/Washington
Southwest Logo
10:45 pm - 9:40 amPDX  Portland-ISP Islip Long Island
7h 55m1 stop Baltimore/Washington
$549Southwest
Sat, Sep 5 - Thu, Sep 10
Southwest Logo
11:55 am - 8:20 pmISP  Islip Long Island-PDX Portland
11h 25m2 stops Baltimore/Washington Chicago Midway
Southwest Logo
10:45 pm - 9:40 amPDX  Portland-ISP Islip Long Island
7h 55m1 stop Baltimore/Washington
$554Southwest
Sat, Sep 5 - Thu, Sep 10
Southwest Logo
5:30 am - 4:20 pmISP  Islip Long Island-PDX Portland
13h 50m2 stops Baltimore/Washington Sacramento Intl
Southwest Logo
7:55 pm - 9:40 amPDX  Portland-ISP Islip Long Island
10h 45m2 stops San Jose Baltimore/Washington
$559Southwest
Sat, Sep 5 - Thu, Sep 10

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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 13
ISP4:20 pmIslip Long Island
9h 45m
2 stops
PDX11:05 pmPortland
Oct 18
PDX11:35 pmPortland
11h 55m
2 stops
ISP2:30 pmIslip Long Island
$433
Southwest
Sep 25
ISP10:20 amIslip Long Island
7h 40m
1 stop
PDX3:00 pmPortland
Sep 27
PDX10:45 pmPortland
7h 55m
1 stop
ISP9:40 amIslip Long Island
$434
Southwest
Sep 25
ISP12:35 pmIslip Long Island
11h 10m
2 stops
PDX8:45 pmPortland
Sep 27
PDX10:45 pmPortland
7h 55m
1 stop
ISP9:40 amIslip Long Island
$439

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 17, 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

Sat 9/5

7:09 pm-12:52 pm

2 stops20h 43m

Portland

Thu 9/10

12:38 pm-4:58 pm

2 stops25h 20m

$418

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Tue 10/13

4:20 pm-11:05 pm

2 stops9h 45m

Portland

Sun 10/18

11:35 pm-2:30 pm

2 stops11h 55m

$433
Quickest round-trip

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Fri 9/25

10:20 am-3:00 pm

1 stop7h 40m

Portland

Sun 9/27

10:45 pm-9:40 am

1 stop7h 55m

$434

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Fri 9/25

12:35 pm-8:45 pm

2 stops11h 10m

Portland

Sun 9/27

10:45 pm-9:40 am

1 stop7h 55m

$439

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Fri 9/25

12:35 pm-8:45 pm

2 stops11h 10m

Portland

Sun 9/27

11:30 pm-12:35 pm

2 stops10h 05m

$444

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Fri 8/28

10:20 am-3:00 pm

1 stop7h 40m

Portland

Tue 9/1

5:50 am-9:05 pm

2 stops12h 15m

$493

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Fri 8/28

12:35 pm-9:15 pm

2 stops11h 40m

Portland

Tue 9/1

5:50 am-9:05 pm

2 stops12h 15m

$498

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Sat 9/5

5:30 am-12:30 pm

1 stop10h 00m

Portland

Thu 9/10

10:45 pm-9:40 am

1 stop7h 55m

$549

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Sat 9/5

11:55 am-8:20 pm

2 stops11h 25m

Portland

Thu 9/10

10:45 pm-9:40 am

1 stop7h 55m

$554

IslipPortland

ISP Islip Long Island - PDX Portland

ISPPDX

Islip Long Island

Sat 9/5

5:30 am-4:20 pm

2 stops13h 50m

Portland

Thu 9/10

7:55 pm-9:40 am

2 stops10h 45m

$559

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Portland from

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 $408. 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 $511.

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 40m

Direct flights

None
The fastest flight from Islip, New York to Portland takes 7h 40m
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 40m.

  • 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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