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Cheap flights from Portland to Porto from $317

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Porto departing on 8/25. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Portland to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:00 am - 9:30 am
PDX
-
OPO
15h 30m
1 stop
United Airlines Logo
6:00 am - 11:12 pm
OPO
-
PDX
25h 12m
2 stops
$741United Airlines
Tue, Dec 1 - Tue, Dec 15
KLM Logo
10:05 pm - 9:05 am
PDX
-
OPO
27h 00m
1 stop
KLM Logo
9:55 am - 11:20 am
OPO
-
PDX
33h 25m
1 stop
$745KLM
Tue, Dec 1 - Tue, Dec 15
Air Canada Logo
7:45 pm - 7:00 am
PDX
-
OPO
27h 15m
2 stops
Air Canada Logo
11:50 am - 6:51 pm
OPO
-
PDX
39h 01m
2 stops
$788Air Canada
Tue, Sep 29 - Thu, Oct 8
Air Canada Logo
3:30 pm - 7:00 am
PDX
-
OPO
55h 30m
2 stops
Air Canada Logo
6:00 am - 9:31 am
OPO
-
PDX
35h 31m
2 stops
$790Air Canada
Sat, Sep 26 - Fri, Oct 16
Delta Logo
7:00 am - 10:30 am
PDX
-
OPO
19h 30m
1 stop
Delta Logo
5:00 am - 11:10 am
OPO
-
PDX
14h 10m
1 stop
$792Delta
Mon, Sep 28 - Fri, Oct 9
Delta Logo
7:00 am - 10:30 am
PDX
-
OPO
19h 30m
1 stop
Delta Logo
5:00 am - 11:10 am
OPO
-
PDX
14h 10m
1 stop
$793Delta
Mon, Sep 28 - Fri, Oct 9
Air Canada Logo
10:10 am - 6:30 pm
PDX
-
OPO
24h 20m
2 stops
Air Canada Logo
11:50 am - 6:51 pm
OPO
-
PDX
39h 01m
2 stops
$794Air Canada
Wed, Sep 30 - Thu, Oct 8
Multiple Airlines Logo
10:33 pm - 7:00 am
PDX
-
OPO
48h 27m
2 stops
Multiple Airlines Logo
6:00 am - 7:06 pm
OPO
-
PDX
21h 06m
2 stops
$795Multiple Airlines
Sat, Sep 26 - Fri, Oct 16
Delta Logo
11:54 am - 3:25 pm
PDX
-
OPO
19h 31m
2 stops
Delta Logo
5:00 am - 11:10 am
OPO
-
PDX
14h 10m
1 stop
$796Delta
Mon, Sep 28 - Fri, Oct 9
Multiple Airlines Logo
9:46 am - 10:30 am
PDX
-
OPO
16h 44m
2 stops
Multiple Airlines Logo
5:00 am - 11:10 am
OPO
-
PDX
14h 10m
1 stop
$797Multiple Airlines
Mon, Sep 28 - Fri, Oct 9

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United Airlines flights from Portland to Porto

Our best United Airlines deals on Portland to Porto flight tickets
United Airlines
Dec 1
PDX10:00 amPortland
15h 30m
1 stop
OPO9:30 amPorto
Dec 15
OPO6:00 amPorto
25h 12m
2 stops
PDX11:12 pmPortland
$741
United Airlines
Sep 26
PDX10:33 pmPortland
27h 12m
1 stop
OPO9:45 amPorto
Oct 16
OPO12:35 pmPorto
30h 58m
2 stops
PDX11:33 amPortland
$820
United Airlines
Aug 17
PDX11:17 pmPortland
22h 58m
1 stop
OPO6:15 amPorto
Aug 26
OPO11:20 amPorto
32h 08m
2 stops
PDX11:28 amPortland
$850

KLM flights from Portland to Porto

Our best KLM deals on Portland to Porto flight tickets
KLM
Dec 1
PDX10:05 pmPortland
27h 00m
1 stop
OPO9:05 amPorto
Dec 15
OPO9:55 amPorto
33h 25m
1 stop
PDX11:20 amPortland
$745
KLM
Sep 26
PDX10:00 pmPortland
28h 25m
1 stop
OPO10:25 amPorto
Oct 16
OPO12:45 pmPorto
16h 42m
1 stop
PDX9:27 pmPortland
$816
KLM
Oct 23
PDX7:00 amPortland
19h 30m
1 stop
OPO10:30 amPorto
Nov 2
OPO5:00 amPorto
14h 20m
1 stop
PDX11:20 amPortland
$832

momondo Fare Finder

 
Customize your flight search to find flights from Portland to Porto 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 June 29, 2026.
Use the filters below to find and compare flights from Portland to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 12/1

10:00 am-9:30 am

1 stop15h 30m

Porto

Tue 12/15

6:00 am-11:12 pm

2 stops25h 12m

$741

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 12/1

10:05 pm-9:05 am

1 stop27h 00m

Porto

Tue 12/15

9:55 am-11:20 am

1 stop33h 25m

$745

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 9/29

7:45 pm-7:00 am

2 stops27h 15m

Porto

Thu 10/8

11:50 am-6:51 pm

2 stops39h 01m

$788

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 9/26

3:30 pm-7:00 am

2 stops55h 30m

Porto

Fri 10/16

6:00 am-9:31 am

2 stops35h 31m

$790

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 9/28

7:00 am-10:30 am

1 stop19h 30m

Porto

Fri 10/9

5:00 am-11:10 am

1 stop14h 10m

$792

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 9/28

7:00 am-10:30 am

1 stop19h 30m

Porto

Fri 10/9

5:00 am-11:10 am

1 stop14h 10m

$793

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 9/30

10:10 am-6:30 pm

2 stops24h 20m

Porto

Thu 10/8

11:50 am-6:51 pm

2 stops39h 01m

$794

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 9/26

10:33 pm-7:00 am

2 stops48h 27m

Porto

Fri 10/16

6:00 am-7:06 pm

2 stops21h 06m

$795

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 9/28

11:54 am-3:25 pm

2 stops19h 31m

Porto

Fri 10/9

5:00 am-11:10 am

1 stop14h 10m

$796
Quickest round-trip

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 9/28

9:46 am-10:30 am

2 stops16h 44m

Porto

Fri 10/9

5:00 am-11:10 am

1 stop14h 10m

$797

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 Porto from

How to get the cheapest flight ticket from Portland to Porto

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 typical price of a round-trip flight between Portland and Porto?

What is the cheapest month to fly to Porto?

The month of January is, on average, the cheapest month to fly to Porto from Portland, with most prices found around $484. If you aren’t able to travel during the month of January, then book flights to Porto from Portland during December instead. Flights to Porto in December, while not as cheap as those in January, still average around $589.

Can stopping save me money on Portland to Porto flights?

You could potentially save up to 22% on your flight if you consider stops on a Portland to Porto flight.

When to book flights from Portland to Porto

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

Cheap Portland to Porto (PDX to OPO) flight deals and tips

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

Fastest flight time

14h 49m

Direct flights

None
The fastest flight from Portland to Porto takes 14h 49m
There are no direct flights from Portland to Porto. There are no popular flight routes from Portland to Porto.
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Frequently asked questions about flying from Portland to Porto

  • How far is Portland to Porto by plane?

    A flight from Portland to Porto will travel around 5195.4 mi. Flights usually cover this in 14h 49m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Portland Airport to Porto Airport?

    Prices for flights from Portland Airport to Porto Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Portland Airport to Porto Airport?

  • How old do you have to be to fly from Portland Airport to Porto Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to Porto Airport.

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

    The travel and health documents required for your trip to Porto Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Porto Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Portland to Porto?

Best airlines flying from Portland to Porto

Compare and see reviews for airlines that fly from Portland to Porto with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $494Free CancellationRating
7.8
8,455 reviews
Search Delta flights
KLMPriceFrom $498Free CancellationRating
7.8
1,531 reviews
Search KLM flights
United AirlinesPriceFrom $502Free CancellationRating
7.4
9,899 reviews
Search United Airlines flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Braga
Aveiro
Matosinhos
Lamego
Esposende
Chaves
Pinhao
Guimarães
Arcos de Valdevez
Espinho
Ponte de Lima
Viseu
Curia
Mesao Frio
Penafiel
Mira
Baiao

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Portland to Porto. Millions of users trust and use momondo every year so you are in good hands.

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

momondo does allow users to show only those flights to Porto from Portland which offer a flexible booking policy as well as other useful filters and features.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Portland to Porto.

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

Yes momondo offers price alerts on flights to Porto from Portland. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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