HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$313+ Cheap flights from Portland (PDX) to Porto (OPO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Feb 23 — Mar 21
Mon 2/23
Mon 3/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to Porto with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Portland to Porto

Cheapest flights from Portland to Porto
Explore the most affordable flight options available from Portland to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 24, 2026.

This United Airlines deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/248:30 am
PDX
-
OPO
2 stops17h 00m
United Airlines
Wed 3/412:35 pm
OPO
-
PDX
2 stops29h 19m
United Airlines
Deal found 1/22$450
This British Airways deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/235:45 pm
PDX
-
OPO
1 stop15h 50m
British Airways
Thu 3/58:20 am
OPO
-
PDX
2 stops23h 57m
British Airways
Deal found 1/22$458
This FlightHub deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1310:10 am
PDX
-
OPO
2 stops36h 40m
Multiple Airlines
Tue 11/37:20 pm
OPO
-
PDX
2 stops34h 48m
Multiple Airlines
Deal found 1/22$461
This British Airways deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:48 am
PDX
-
OPO
2 stops44h 57m
British Airways
Thu 3/128:20 am
OPO
-
PDX
2 stops22h 55m
British Airways
Deal found 1/22$468
This British Airways deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/235:45 pm
PDX
-
OPO
1 stop15h 50m
British Airways
Wed 3/48:40 pm
OPO
-
PDX
2 stops35h 37m
British Airways
Deal found 1/22$469
This United Airlines deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/111:59 pm
PDX
-
OPO
2 stops25h 31m
United Airlines
Mon 3/912:35 pm
OPO
-
PDX
1 stop16h 17m
United Airlines
Deal found 1/22$475
This British Airways deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:48 am
PDX
-
OPO
2 stops44h 57m
British Airways
Mon 3/912:25 pm
OPO
-
PDX
2 stops42h 55m
British Airways
Deal found 1/22$479
This Air Canada deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/127:05 pm
PDX
-
OPO
2 stops44h 20m
Multiple Airlines
Fri 4/246:20 am
OPO
-
PDX
2 stops34h 55m
Multiple Airlines
Deal found 1/22$481
This KLM deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/121:05 pm
PDX
-
OPO
1 stop21h 05m
KLM
Fri 4/245:00 am
OPO
-
PDX
1 stop14h 10m
KLM
Deal found 1/23$483
This Delta deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/246:00 am
PDX
-
OPO
2 stops20h 30m
Delta
Mon 3/25:00 am
OPO
-
PDX
1 stop14h 25m
Delta
Deal found 1/22$484

Find flight deals from Portland to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$450
(United Airlines)

One-way from

$313
(Kiwi.com)

Popular in

May

Cheapest in

January

Average price

$484
Provider with most accurate pricing for Portland-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Porto flights.
Search Deals
From Portland to Porto
Search Deals
One-way flight from Portland to Porto
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($196 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated January 24, 2026.
Use the filters below to find and compare flights from Portland to Porto that are best for you.

Fly from

Portland

Fly to

Porto

Route

Depart

Return

Price

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 2/24

8:30 am-9:30 am

2 stops17h 00m

Porto

Tue 3/3

12:35 pm-9:42 am

2 stops29h 07m

$450

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 2/24

8:30 am-9:30 am

2 stops17h 00m

Porto

Wed 3/4

12:35 pm-9:54 am

2 stops29h 19m

$450

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 2/24

6:40 am-5:45 pm

2 stops27h 05m

Porto

Tue 3/3

8:20 am-12:17 am

2 stops23h 57m

$463

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 3/2

11:48 am-5:35 pm

2 stops21h 47m

Porto

Mon 3/9

8:40 pm-12:20 am

2 stops34h 40m

$473

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 3/1

11:59 pm-9:30 am

2 stops25h 31m

Porto

Thu 3/12

12:35 pm-9:52 pm

1 stop16h 17m

$475

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 4/12

7:05 pm-11:25 pm

2 stops44h 20m

Porto

Fri 4/24

6:20 am-9:15 am

2 stops34h 55m

$481

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 3/1

6:00 am-10:30 am

2 stops20h 30m

Porto

Fri 3/13

5:00 am-12:25 pm

1 stop14h 25m

$484

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 2/25

6:00 am-10:30 am

2 stops20h 30m

Porto

Thu 3/5

11:15 am-11:25 am

1 stop32h 10m

$484

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 3/1

6:00 am-10:30 am

2 stops20h 30m

Porto

Sat 3/7

11:15 am-11:25 am

1 stop32h 10m

$484

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 2/22

6:00 am-10:30 am

2 stops20h 30m

Porto

Tue 3/3

11:15 am-11:25 am

1 stop32h 10m

$484

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/23

Showing 1-10 of 19 results
1
2

Compare providers for flights from Portland to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Porto in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland-Porto flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Portland to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Portland with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Portland to Porto

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

Use this chart to determine the optimal time to book a round-trip flight from Portland to Porto. Price data was last updated on January 16, 2026.

To ensure you get the cheapest price possible for a flight from Portland to Porto, you should look to book at least 57 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Portland to Porto?

Currently, January is the cheapest month in which you can book a flight from Portland to Porto (average of $470). Flying from Portland to Porto in May is currently the most expensive (average of $970). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Portland to Porto?

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated January 24, 2026.
See what other customers who have flown with Delta, KLM, and United Airlines from Portland to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,110 reviews

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,110 reviews
Delta
7.9
Good
8,110 reviews

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
KLM
7.7
Good
1,443 reviews
Delta
7.9
Good
8,110 reviews

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,194 reviews
Delta
7.9
Good
8,110 reviews

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Portland to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Portland to Porto?

    A quick flight from Portland to Porto can take about 17h. United Airlines provides one of the quickest options available for as low as $450. Airlines will cover a distance of 5183 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Portland to Porto round-trip?

    According to our current data, Delta ($494), KLM ($498), and United Airlines ($644) offers the cheapest pricing from Portland to Porto. Delta is currently priced 48% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Portland to Porto one-way?

    $424 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on KLM and United Airlines, with prices starting from $535 and $582, respectively.

  • Can I find deals for flights from Portland to Porto that include hotel bookings?

    Yes. In addition to deals on Portland to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Porto.

  • Can I find deals for business class flights from Portland to Porto?

    Yes. Cheapflights offers flight deals from Portland to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portland to Porto?

    Currently, January is the cheapest month in which you can book a flight from Portland to Porto (average of $470). Flying from Portland to Porto in May is currently the most expensive (average of $970). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to Porto

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Lisbon flights
Boise to Lisbon flights
Eugene to Lisbon flights
Redmond to Lisbon flights
Portland to Faro flights
Portland to Ponta Delgada flights
Eugene to Porto flights

Top 3 airlines flying from Portland to Porto

Discover the top 3 airlines that operate flights from Portland to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$494Average$957FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$498Average$892FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$644Average$1,045FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.