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$361+ 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 4/6. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
1 adult, Economy
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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

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3. Compare prices and book

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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 November 6, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$490
(United)

One-way from

$361
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$690
Provider with most accurate pricing for Portland-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Porto flights.
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From Portland to Porto
Search Deals
One-way flight from Portland to Porto
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($241 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 November 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 November 6, 2025.

This United deal was found by Cheapflights users on 11/5. 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.
Wed 12/317:45 pmPDX - OPO
2 stops43h 55mMultiple Airlines
Mon 2/21:45 pmOPO - PDX
2 stops36h 45mMultiple Airlines
Deal found 11/5$490
This KLM deal was found by Cheapflights users on 11/5. 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.
Wed 12/311:25 pmPDX - OPO
1 stop25h 00mKLM
Wed 1/216:00 amOPO - PDX
2 stops24h 15mKLM
Deal found 11/5$492
This United deal was found by Cheapflights users on 11/5. 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.
Wed 12/317:45 pmPDX - OPO
2 stops43h 55mMultiple Airlines
Wed 1/2112:30 pmOPO - PDX
2 stops38h 00mMultiple Airlines
Deal found 11/5$507
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/310:10 amPDX - OPO
2 stops21h 15mMultiple Airlines
Tue 12/1612:30 pmOPO - PDX
2 stops20h 07mMultiple Airlines
Deal found 11/4$589
This Orbitz deal was found by Cheapflights users on 11/5. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/310:10 amPDX - OPO
2 stops29h 30mLufthansa
Tue 12/164:15 pmOPO - PDX
2 stops40h 26mLufthansa
Deal found 11/5$596
This Delta deal was found by Cheapflights users on 11/5. 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 12/35:30 amPDX - OPO
2 stops21h 00mDelta
Tue 12/1611:25 amOPO - PDX
2 stops18h 50mDelta
Deal found 11/5$597
This KLM deal was found by Cheapflights users on 11/5. 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.
Wed 12/31:25 pmPDX - OPO
1 stop21h 55mKLM
Tue 12/1611:25 amOPO - PDX
2 stops18h 50mKLM
Deal found 11/5$598
This United Airlines deal was found by Cheapflights users on 11/5. 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 12/310:10 amPDX - OPO
2 stops21h 15mUnited Airlines
Tue 12/166:00 amOPO - PDX
2 stops26h 37mUnited Airlines
Deal found 11/5$602
This Ovago deal was found by Cheapflights users on 11/5. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/91:14 pmPDX - OPO
2 stops17h 31mLufthansa
Sun 1/111:45 pmOPO - PDX
2 stops42h 54mLufthansa
Deal found 11/5$622
This United Airlines deal was found by Cheapflights users on 11/5. 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 12/315:00 amPDX - OPO
2 stops46h 40mUnited Airlines
Mon 2/212:30 pmOPO - PDX
3 stops62h 18mUnited Airlines
Deal found 11/5$624
This Ovago deal was found by Cheapflights users on 11/4. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/33:55 pmPDX - OPO
2 stops23h 45mLufthansa
Wed 12/176:00 amOPO - PDX
2 stops23h 14mLufthansa
Deal found 11/4$686

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 November 6, 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 12/31

7:45 pm-11:40 pm

2 stops43h 55m

Porto

Mon 2/2

1:45 pm-6:30 pm

2 stops36h 45m

$490

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 12/31

1:25 pm-10:25 pm

1 stop25h 00m

Porto

Wed 1/21

6:00 am-10:15 pm

2 stops24h 15m

$492

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 1/11

10:47 am-12:05 pm

2 stops17h 18m

Porto

Sun 2/8

6:00 am-6:10 pm

2 stops20h 10m

$492

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 1/14

1:25 pm-7:20 pm

1 stop21h 55m

Porto

Fri 2/6

6:30 am-5:35 pm

2 stops19h 05m

$492

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 12/31

7:45 pm-11:40 pm

2 stops43h 55m

Porto

Wed 1/21

12:30 pm-6:30 pm

2 stops38h 00m

$507

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 1/1

7:30 am-12:50 pm

2 stops21h 20m

Porto

Sat 1/24

1:45 pm-6:30 pm

2 stops36h 45m

$584

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 12/3

10:10 am-3:25 pm

2 stops21h 15m

Porto

Tue 12/16

12:30 pm-12:37 am

2 stops20h 07m

$589

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 1/1

5:00 am-11:40 am

2 stops46h 40m

Porto

Sun 2/1

12:30 pm-6:48 pm

2 stops38h 18m

$594

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 12/3

5:30 am-10:30 am

2 stops21h 00m

Porto

Tue 12/16

11:25 am-10:15 pm

2 stops18h 50m

$597

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 12/3

1:25 pm-7:20 pm

1 stop21h 55m

Porto

Tue 12/16

11:25 am-10:15 pm

2 stops18h 50m

$598

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Portland-Porto flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 31, 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 $535). 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 November 6, 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 November 6, 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
7.9
Good
8,004 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

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
8,004 reviews
Delta
7.9
Good
8,004 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

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
1,405 reviews
Delta
7.9
Good
8,004 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

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
9,003 reviews
Delta
7.9
Good
8,004 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

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 25h. KLM provides one of the quickest options available for as low as $492. 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 ($647), KLM ($647), and Delta ($709) offers the cheapest pricing from Portland to Porto. United Airlines is currently priced 36% 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 $535). 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
Vila Nova de Gaia

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.
Portland to Lisbon flights
Boise to Lisbon flights
Eugene to Lisbon flights
Portland to Ponta Delgada flights
Portland to Faro flights
Redmond to Lisbon 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 November 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$647Average$1,105FlexibilityNo cancel feeOn-time69%
KLMCheapest$647Average$1,081FlexibilityNo cancel feeOn-time75%
DeltaCheapest$709Average$1,079FlexibilityNo cancel feeOn-timeN/A

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