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$247+ 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 4/20. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Apr 16 — Apr 231
Thu 4/16
Thu 4/23
1 adult, Economy
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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 March 17, 2026.

This American Airlines deal was found by Cheapflights users on 3/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/181:28 pm
PDX
-
OPO
2 stops22h 32m
Multiple Airlines
Wed 10/288:40 pm
OPO
-
PDX
2 stops21h 17m
Multiple Airlines
Deal found 3/16$684
This Expedia deal was found by Cheapflights users on 3/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:30 pm
PDX
-
OPO
2 stops28h 10m
Iberia
Fri 10/912:25 pm
OPO
-
PDX
2 stops40h 22m
Iberia
Deal found 3/13$718
This Gotogate deal was found by Cheapflights users on 3/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/197:30 pm
PDX
-
OPO
1 stop17h 05m
Multiple Airlines
Tue 5/58:40 pm
OPO
-
PDX
2 stops29h 00m
Multiple Airlines
Deal found 3/16$726
This Expedia deal was found by Cheapflights users on 3/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/271:52 pm
PDX
-
OPO
2 stops22h 08m
Iberia
Mon 5/48:40 pm
OPO
-
PDX
2 stops56h 58m
Iberia
Deal found 3/13$731
This British Airways deal was found by Cheapflights users on 3/16. 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.
Sun 4/197:30 pm
PDX
-
OPO
1 stop17h 05m
British Airways
Tue 5/58:55 pm
OPO
-
PDX
1 stop28h 45m
British Airways
Deal found 3/16$742
This Expedia deal was found by Cheapflights users on 3/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/281:52 pm
PDX
-
OPO
2 stops22h 08m
Iberia
Thu 5/148:20 am
OPO
-
PDX
2 stops23h 34m
Iberia
Deal found 3/13$744
This Gotogate deal was found by Cheapflights users on 3/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/251:52 pm
PDX
-
OPO
2 stops46h 43m
Multiple Airlines
Tue 5/58:40 pm
OPO
-
PDX
2 stops29h 00m
Multiple Airlines
Deal found 3/15$760
This Mytrip deal was found by Cheapflights users on 3/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/273:30 pm
PDX
-
OPO
3 stops22h 25m
Multiple Airlines
Mon 5/41:30 pm
OPO
-
PDX
2 stops28h 00m
Multiple Airlines
Deal found 3/13$780
This Flysmarter deal was found by Cheapflights users on 3/13. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/271:05 pm
PDX
-
OPO
1 stop18h 25m
KLM
Mon 5/44:20 pm
OPO
-
PDX
1 stop26h 50m
KLM
Deal found 3/13$791

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 March 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$726
(Gotogate)

One-way from

$247
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$905
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. 21% potential increase in price ($257 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 17, 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

Sun 4/19

7:30 pm-8:35 pm

1 stop17h 05m

Porto

Tue 5/5

8:55 pm-5:40 pm

1 stop28h 45m

$742

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 5/2

11:56 am-8:40 pm

2 stops24h 44m

Porto

Sat 5/9

8:40 pm-10:47 pm

2 stops34h 07m

$832

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 4/30

7:15 am-3:45 pm

2 stops24h 30m

Porto

Thu 5/7

6:00 am-6:45 pm

2 stops20h 45m

$875

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 5/5

1:05 pm-10:15 pm

1 stop25h 10m

Porto

Fri 5/15

5:00 am-11:10 am

1 stop14h 10m

$882

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 5/3

3:35 pm-3:30 pm

2 stops15h 55m

Porto

Sun 5/10

5:55 am-5:15 pm

2 stops19h 20m

$898

PortlandPorto

PDX - OPO

PDXOPO

Portland

Thu 4/16

1:05 pm-3:30 pm

1 stop18h 25m

Porto

Thu 4/30

4:20 pm-11:10 am

1 stop26h 50m

$932

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 4/28

1:05 pm-10:55 am

1 stop13h 50m

Porto

Thu 5/14

4:20 pm-11:10 am

1 stop26h 50m

$981

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 4/24

1:05 pm-6:10 pm

1 stop21h 05m

Porto

Sun 5/10

5:00 am-11:10 am

1 stop14h 10m

$982
Quickest round-trip

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 4/28

1:32 pm-6:20 pm

2 stops20h 48m

Porto

Thu 5/14

5:00 am-11:10 am

1 stop14h 10m

$986

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 4/24

1:05 pm-10:15 pm

1 stop25h 10m

Porto

Sun 5/10

5:55 am-5:15 pm

2 stops19h 20m

$999

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/14

Showing 1-10 of 20 resultsSorted by cheapest first
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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice 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 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 March 13, 2026.

To ensure you get the cheapest price possible for a flight from Portland to Porto, you should look to book at least 45 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 $889). 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 March 17, 2026.
See what other customers who have flown with Delta,KLM, andUnited 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
8,288 reviews

Comfort

7.9

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Crew

8.5

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
8,288 reviews
Delta
7.9
Good
8,288 reviews

Comfort

7.9

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Crew

8.5

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
7.8
Good
1,472 reviews
Delta
7.9
Good
8,288 reviews

Comfort

7.9

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Crew

8.5

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
9,432 reviews
Delta
7.9
Good
8,288 reviews

Comfort

7.9

Entertainment

7.8

Food

7.2

Overall

7.9

Boarding

8.1

Crew

8.5

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 21h 15m. KLM provides one of the quickest options available for as low as $850. 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 ($502) offers the cheapest pricing from Portland to Porto. Delta is currently priced 46% 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 $503 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 $889). 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

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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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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 March 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$494Average$1,020FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$498Average$892FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$502Average$1,061FlexibilityNo cancel feeOn-time69%

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