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Cheap flights from Portland to Porto from $304

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 8/27. 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.
Multiple Airlines Logo
3:30 pm - 9:30 am
PDX
-
OPO
34h 00m
3 stops
Multiple Airlines Logo
10:45 am - 11:45 am
OPO
-
PDX
33h 00m
2 stops
$719Multiple Airlines
Tue, Aug 18 - Wed, Aug 26
Multiple Airlines Logo
3:30 pm - 8:00 am
PDX
-
OPO
32h 30m
3 stops
Multiple Airlines Logo
10:20 pm - 1:50 pm
OPO
-
PDX
47h 30m
3 stops
$805Multiple Airlines
Tue, Aug 18 - Thu, Aug 27
Multiple Airlines Logo
3:30 pm - 8:00 am
PDX
-
OPO
32h 30m
3 stops
Multiple Airlines Logo
10:20 pm - 1:50 pm
OPO
-
PDX
47h 30m
3 stops
$811Multiple Airlines
Tue, Aug 18 - Thu, Aug 27
Multiple Airlines Logo
3:30 pm - 5:50 pm
PDX
-
OPO
18h 20m
2 stops
Multiple Airlines Logo
8:25 am - 9:31 am
OPO
-
PDX
33h 06m
3 stops
$812Multiple Airlines
Tue, Aug 18 - Tue, Aug 25
Air Canada Logo
7:45 pm - 7:00 am
PDX
-
OPO
27h 15m
2 stops
Air Canada Logo
11:20 am - 9:31 am
OPO
-
PDX
30h 11m
2 stops
$842Air Canada
Tue, Aug 18 - Wed, Aug 26
Multiple Airlines Logo
3:30 pm - 5:50 pm
PDX
-
OPO
18h 20m
2 stops
Multiple Airlines Logo
10:20 pm - 1:50 pm
OPO
-
PDX
47h 30m
3 stops
$848Multiple Airlines
Tue, Aug 18 - Thu, Aug 27
Air Canada Logo
3:30 pm - 7:00 am
PDX
-
OPO
31h 30m
2 stops
Air Canada Logo
11:20 am - 10:52 pm
OPO
-
PDX
43h 32m
2 stops
$849Air Canada
Mon, Aug 17 - Wed, Aug 26
United Airlines Logo
11:17 pm - 6:15 am
PDX
-
OPO
22h 58m
1 stop
United Airlines Logo
11:20 am - 6:53 pm
OPO
-
PDX
39h 33m
2 stops
$850United Airlines
Mon, Aug 17 - Wed, Aug 26
Air Canada Logo
7:45 pm - 7:00 am
PDX
-
OPO
51h 15m
2 stops
Air Canada Logo
6:20 am - 9:31 am
OPO
-
PDX
35h 11m
2 stops
$852Air Canada
Sat, Aug 8 - Fri, Sep 18
KLM Logo
7:00 am - 10:30 am
PDX
-
OPO
19h 30m
1 stop
KLM Logo
7:55 pm - 11:10 am
OPO
-
PDX
23h 15m
1 stop
$853KLM
Mon, Aug 17 - Mon, Sep 7

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British Airways flights from Portland to Porto

Our best British Airways deals on Portland to Porto flight tickets
British Airways
Sep 21
PDX2:07 pmPortland
21h 58m
2 stops
OPO8:05 pmPorto
Sep 30
OPO8:20 amPorto
19h 16m
2 stops
PDX7:36 pmPortland
$837
British Airways
Sep 21
PDX7:30 pmPortland
16h 35m
1 stop
OPO8:05 pmPorto
Oct 6
OPO8:20 amPorto
22h 39m
2 stops
PDX10:59 pmPortland
$838

Delta flights from Portland to Porto

Our best Delta deals on Portland to Porto flight tickets
Delta
Sep 21
PDX9:43 amPortland
21h 47m
2 stops
OPO3:30 pmPorto
Oct 2
OPO5:00 amPorto
14h 10m
1 stop
PDX11:10 amPortland
$862
Delta
Sep 19
PDX10:00 pmPortland
28h 25m
1 stop
OPO10:25 amPorto
Oct 2
OPO5:00 amPorto
14h 10m
1 stop
PDX11:10 amPortland
$866
Delta
Sep 23
PDX11:43 amPortland
19h 42m
2 stops
OPO3:25 pmPorto
Oct 8
OPO5:00 amPorto
18h 05m
2 stops
PDX3:05 pmPortland
$867

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 13, 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 8/18

3:30 pm-9:30 am

3 stops34h 00m

Porto

Wed 8/26

10:45 am-11:45 am

2 stops33h 00m

$719

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 8/18

3:30 pm-8:00 am

3 stops32h 30m

Porto

Thu 8/27

10:20 pm-1:50 pm

3 stops47h 30m

$805

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 8/18

3:30 pm-8:00 am

3 stops32h 30m

Porto

Thu 8/27

10:20 pm-1:50 pm

3 stops47h 30m

$811

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 8/18

3:30 pm-5:50 pm

2 stops18h 20m

Porto

Tue 8/25

8:25 am-9:31 am

3 stops33h 06m

$812

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 8/18

7:45 pm-7:00 am

2 stops27h 15m

Porto

Wed 8/26

11:20 am-9:31 am

2 stops30h 11m

$842

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 8/18

3:30 pm-5:50 pm

2 stops18h 20m

Porto

Thu 8/27

10:20 pm-1:50 pm

3 stops47h 30m

$848

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 8/17

3:30 pm-7:00 am

2 stops31h 30m

Porto

Wed 8/26

11:20 am-10:52 pm

2 stops43h 32m

$849

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 8/17

11:17 pm-6:15 am

1 stop22h 58m

Porto

Wed 8/26

11:20 am-6:53 pm

2 stops39h 33m

$850

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 8/8

7:45 pm-7:00 am

2 stops51h 15m

Porto

Fri 9/18

6:20 am-9:31 am

2 stops35h 11m

$852
Quickest round-trip

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 8/17

7:00 am-10:30 am

1 stop19h 30m

Porto

Mon 9/7

7:55 pm-11:10 am

1 stop23h 15m

$853

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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.

How far in advance should I book a flight from Portland to Porto?

You are more likely to see cheaper flights to Porto from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $900 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Portland for as low as $714 on momondo.

Can stopping save me money on Portland to Porto flights?

You could potentially save up to 2% 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

16h 35m

Direct flights

None
The fastest flight from Portland to Porto takes 16h 35m
There are no direct flights from Portland to Porto. There are no popular flight routes from Portland to Porto.
Search flight deals

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 16h 35m, 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
7.9
8,405 reviews
Search Delta flights
KLMPriceFrom $498Free CancellationRating
7.8
1,527 reviews
Search KLM flights
United AirlinesPriceFrom $502Free CancellationRating
7.4
9,815 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
Chaves
Esposende
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Ponte de Lima
Viseu
Curia
Mesao Frio
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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