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$435+ 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Nov 13 — Nov 201
Thu 11/13
Thu 11/20
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Porto are usually found in November or December, booked 33 days in advance, depart on a Monday or Tuesday and return on a Tuesday

Cheap 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 October 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$525
(KAYAK)

One-way from

$435
(Ovago)

Popular in

June

Cheapest in

November

Average price

$1,068
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. 18% potential increase in price ($240 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 October 14, 2025.

This KAYAK deal was found by Cheapflights users on 10/13. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2710:52 amPDX - OPO
2 stops40h 18mSWISS
Fri 12/512:50 pmOPO - PDX
2 stops41h 25mSWISS
Deal found 10/13$525
This Delta deal was found by Cheapflights users on 10/13. 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.
Wed 11/1210:10 pmPDX - OPO
2 stops28h 15mDelta
Sat 12/611:15 amOPO - PDX
1 stop32h 10mDelta
Deal found 10/13$530
This Delta deal was found by Cheapflights users on 10/13. 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.
Thu 11/1311:15 pmPDX - OPO
2 stops27h 15mDelta
Thu 12/411:15 amOPO - PDX
1 stop32h 10mDelta
Deal found 10/13$531
This Delta deal was found by Cheapflights users on 10/13. 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.
Wed 11/121:25 pmPDX - OPO
1 stop18h 00mDelta
Sun 11/165:00 amOPO - PDX
1 stop14h 25mDelta
Deal found 10/13$532
This United Airlines deal was found by Cheapflights users on 10/13. 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.
Wed 11/127:00 amPDX - OPO
2 stops18h 30mUnited Airlines
Thu 12/46:00 amOPO - PDX
2 stops26h 37mUnited Airlines
Deal found 10/13$537
This Air Canada deal was found by Cheapflights users on 10/12. 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.
Tue 11/113:15 pmPDX - OPO
2 stops40h 10mAir Canada
Fri 12/126:15 amOPO - PDX
2 stops20h 15mAir Canada
Deal found 10/12$539
This Delta deal was found by Cheapflights users on 10/13. 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.
Mon 11/1012:35 amPDX - OPO
2 stops25h 55mDelta
Thu 12/46:35 amOPO - PDX
2 stops22h 17mDelta
Deal found 10/13$541
This Delta deal was found by Cheapflights users on 10/12. 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.
Wed 11/121:25 pmPDX - OPO
1 stop13h 05mDelta
Mon 12/86:30 amOPO - PDX
2 stops22h 22mDelta
Deal found 10/12$542
This United Airlines deal was found by Cheapflights users on 10/12. 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.
Wed 11/126:00 amPDX - OPO
3 stops19h 30mUnited Airlines
Sun 11/166:00 amOPO - PDX
2 stops36h 53mUnited Airlines
Deal found 10/12$543
This United deal was found by Cheapflights users on 10/12. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1311:12 pmPDX - OPO
1 stop26h 18mMultiple Airlines
Thu 12/112:05 pmOPO - PDX
2 stops36h 25mMultiple Airlines
Deal found 10/12$546
This Delta deal was found by Cheapflights users on 10/12. 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.
Mon 11/109:59 amPDX - OPO
2 stops16h 31mDelta
Sat 12/1311:25 amOPO - PDX
2 stops18h 45mDelta
Deal found 10/12$547

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 October 14, 2025.
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

Wed 11/12

10:10 pm-10:25 am

2 stops28h 15m

Porto

Sun 12/7

5:00 am-11:25 am

1 stop14h 25m

$530

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/12

10:10 pm-10:25 am

2 stops28h 15m

Porto

Thu 12/4

11:15 am-11:25 am

1 stop32h 10m

$530

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/12

9:59 am-10:30 am

2 stops16h 31m

Porto

Sun 11/16

5:00 am-11:25 am

1 stop14h 25m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 2/11

6:15 am-10:30 am

2 stops20h 15m

Porto

Thu 2/26

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 11/10

12:35 am-10:30 am

2 stops25h 55m

Porto

Sat 12/6

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 11/11

11:35 am-10:30 am

2 stops14h 55m

Porto

Thu 12/4

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 2/9

6:15 am-10:30 am

2 stops20h 15m

Porto

Thu 2/26

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

10:10 pm-10:30 am

2 stops28h 20m

Porto

Sat 12/6

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

11:15 pm-10:30 am

2 stops27h 15m

Porto

Thu 12/4

11:15 am-11:25 am

1 stop32h 10m

$531

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 11/13

11:15 pm-10:30 am

2 stops27h 15m

Porto

Sun 12/7

5:00 am-11:25 am

1 stop14h 25m

$531

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 20 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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 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 FlightHub the most. FlightHub 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 October 10, 2025.

To ensure you get the cheapest price possible for a flight from Portland to Porto, you should look to book at least 33 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, November is the cheapest month in which you can book a flight from Portland to Porto (average of $540). Flying from Portland to Porto in June is currently the most expensive (average of $943). 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.

What is the cheapest time of day to fly from PDX to OPO?

Find hourly flight availability from Portland to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 14, 2025.

A simple way to save on the total cost of your ticket is to fly from Portland to Porto at noon. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight in the morning.

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 October 14, 2025.
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
8.0
Very good
7,973 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
8.0
Very good
7,973 reviews
Delta
8.0
Very good
7,973 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
KLM
7.7
Good
1,402 reviews
Delta
8.0
Very good
7,973 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
8,973 reviews
Delta
8.0
Very good
7,973 reviews

Food

7.3

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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 28h 15m. Delta provides one of the quickest options available for as low as $530. Airlines will cover a distance of 5183 mi.

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

    According to our current data, United Airlines ($669), Delta ($684), and KLM ($736) offers the cheapest pricing from Portland to Porto. United Airlines is currently priced 34% below the average price you’ll pay for this route.

  • 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, November is the cheapest month in which you can book a flight from Portland to Porto (average of $540). Flying from Portland to Porto in June is currently the most expensive (average of $943). 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
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Portland to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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Portland to Faro 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 October 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$647Average$1,091FlexibilityNo cancel feeOn-time69%
DeltaCheapest$684Average$1,082FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$736Average$1,088FlexibilityNo cancel feeOn-time75%

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