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Cheap flights from Islip to Portland from $415

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 to Portland departing on 11/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Islip to Portland

Cheap round-trip flights

Southwest Logo
12:35 pm - 9:40 pmISP-PDX
12h 05m2 stops
Southwest Logo
6:10 am - 10:40 pmPDX-ISP
13h 30m2 stops
$439Southwest
Find Deal
Fri, Oct 3 - Sun, Oct 5
Southwest Logo
12:35 pm - 9:40 pmISP-PDX
12h 05m2 stops
Southwest Logo
6:10 am - 10:40 pmPDX-ISP
13h 30m2 stops
$453Southwest
Find Deal
Fri, Oct 3 - Sun, Oct 5
Southwest Logo
3:05 pm - 11:05 pmISP-PDX
11h 00m2 stops
Southwest Logo
7:00 am - 10:05 pmPDX-ISP
12h 05m2 stops
$507Southwest
Find Deal
Thu, Sep 11 - Tue, Sep 16
Southwest Logo
6:00 am - 4:00 pmISP-PDX
13h 00m1 stop
Southwest Logo
9:05 pm - 11:55 amPDX-ISP
11h 50m1 stop
$508Southwest
Find Deal
Thu, Sep 11 - Tue, Sep 16
Southwest Logo
3:40 pm - 8:35 pmISP-PDX
7h 55m1 stop
Southwest Logo
9:05 pm - 12:05 pmPDX-ISP
12h 00m1 stop
$532Southwest
Find Deal
Sat, Sep 13 - Fri, Sep 19
Southwest Logo
12:15 pm - 9:30 pmISP-PDX
12h 15m2 stops
Southwest Logo
9:05 pm - 12:05 pmPDX-ISP
12h 00m1 stop
$538Southwest
Find Deal
Sat, Sep 13 - Fri, Sep 19
Southwest Logo
5:40 am - 4:25 pmISP-PDX
13h 45m2 stops
Southwest Logo
9:25 am - 10:55 pmPDX-ISP
10h 30m2 stops
$551Southwest
Find Deal
Sat, Sep 13 - Fri, Sep 19
Southwest Logo
12:40 pm - 10:00 pmISP-PDX
12h 20m2 stops
Southwest Logo
5:20 am - 11:55 pmPDX-ISP
15h 35m2 stops
$568Southwest
Find Deal
Tue, Nov 25 - Mon, Dec 1
Frontier Logo
9:37 pm - 11:48 amISP-PDX
17h 11m2 stops
Frontier Logo
12:43 pm - 10:37 amPDX-ISP
18h 54m2 stops
$715Frontier
Find Deal
Thu, Oct 16 - Sun, Oct 19
Logo
2:19 pm - 8:10 pmISP-PDX
8h 51m1 stop
Logo
8:39 pm - 10:58 amPDX-ISP
11h 19m2 stops
$873
Find Deal
Thu, Dec 11 - Mon, Dec 15

Frontier flights from Islip to Portland

Our best Frontier deals on Islip to Portland flight tickets
Frontier
Oct 16
ISP9:37 pmIslip Long Island
17h 11m
2 stops
PDX11:48 amPortland
Oct 19
PDX12:43 pmPortland
18h 54m
2 stops
ISP10:37 amIslip Long Island
$715
Find similar
Frontier
Aug 28
ISP9:01 pmIslip Long Island
17h 22m
2 stops
PDX11:23 amPortland
Aug 31
PDX12:18 pmPortland
20h 58m
2 stops
ISP12:16 pmIslip Long Island
$866
Find similar

Southwest flights from Islip to Portland

Our best Southwest deals on Islip to Portland flight tickets
Southwest
Oct 3
ISP12:35 pmIslip Long Island
12h 05m
2 stops
PDX9:40 pmPortland
Oct 5
PDX6:10 amPortland
13h 30m
2 stops
ISP10:40 pmIslip Long Island
$439
Find similar
Southwest
Oct 3
ISP12:35 pmIslip Long Island
12h 05m
2 stops
PDX9:40 pmPortland
Oct 5
PDX6:10 amPortland
13h 30m
2 stops
ISP10:40 pmIslip Long Island
$453
Find similar
Southwest
Sep 11
ISP3:05 pmIslip Long Island
11h 00m
2 stops
PDX11:05 pmPortland
Sep 16
PDX7:00 amPortland
12h 05m
2 stops
ISP10:05 pmIslip Long Island
$507
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated August 26, 2025.
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

Price

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Fri 10/3

12:35 pm-9:40 pm

2 stops12h 05m

Portland

Sun 10/5

6:10 am-10:40 pm

2 stops13h 30m

$439

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Fri 10/3

12:35 pm-9:40 pm

2 stops12h 05m

Portland

Sun 10/5

6:10 am-10:40 pm

2 stops13h 30m

$453

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Thu 9/11

3:05 pm-11:05 pm

2 stops11h 00m

Portland

Tue 9/16

7:00 am-10:05 pm

2 stops12h 05m

$507

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Thu 9/11

6:00 am-4:00 pm

1 stop13h 00m

Portland

Tue 9/16

9:05 pm-11:55 am

1 stop11h 50m

$508

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Sat 9/13

3:40 pm-8:35 pm

1 stop7h 55m

Portland

Fri 9/19

9:05 pm-12:05 pm

1 stop12h 00m

$532

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Sat 9/13

12:15 pm-9:30 pm

2 stops12h 15m

Portland

Fri 9/19

9:05 pm-12:05 pm

1 stop12h 00m

$538

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Sat 9/13

5:40 am-4:25 pm

2 stops13h 45m

Portland

Fri 9/19

9:25 am-10:55 pm

2 stops10h 30m

$551

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Tue 11/25

12:40 pm-10:00 pm

2 stops12h 20m

Portland

Mon 12/1

5:20 am-11:55 pm

2 stops15h 35m

$568

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Thu 10/16

9:37 pm-11:48 am

2 stops17h 11m

Portland

Sun 10/19

12:43 pm-10:37 am

2 stops18h 54m

$715

IslipPortland

ISP - PDX

ISPPDX

Islip Long Island

Thu 12/11

2:19 pm-8:10 pm

1 stop8h 51m

Portland

Mon 12/15

8:39 pm-10:58 am

2 stops11h 19m

$873

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portland from

How to get the cheapest flight ticket from Islip 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 $392. 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 Sunday, with ticket prices averaging around $490.

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

The cheapest time of day to fly to Portland is at noon when flights can be purchased for as low as $305. In the afternoon is when there is more demand to fly to Portland, so prices are often more expensive at around $434 per ticket.

Can stopping save me money on Islip to Portland flights?

You could potentially save up to 45% on your flight if you consider stops on a Islip to Portland flight.

When to book flights from Islip to Portland

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

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

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

Direct flights

None
There are no direct flights from Islip to Portland. There are no popular flight routes from Islip to Portland.
Search flight deals

  • 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 55m.

  • 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
Cannon Beach
Vancouver
Salem
Astoria
Long Beach
Depoe Bay
Rockaway Beach
Beaverton
Hillsboro
Hood River
Gresham
McMinnville
Longview
Tigard
The Dalles
Pacific City
Manzanita
Tillamook

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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