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$323+ 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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Jun 15 — Jun 221
Mon 6/15
Mon 6/22
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 May 16, 2026.

This Lufthansa deal was found by Cheapflights users on 5/12. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/277:11 am
PDX
-
OPO
2 stops21h 29m
Lufthansa
Wed 11/412:30 pm
OPO
-
PDX
2 stops19h 32m
Lufthansa
Deal found 5/12$707
This FlightHub deal was found by Cheapflights users on 5/11. 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.
Wed 11/41:00 pm
PDX
-
OPO
2 stops43h 55m
Scandinavian Airlines
Fri 11/135:45 pm
OPO
-
PDX
2 stops35h 42m
Scandinavian Airlines
Deal found 5/11$760
This Expedia deal was found by Cheapflights users on 5/11. 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.
Wed 10/2111:55 am
PDX
-
OPO
2 stops20h 05m
Iberia
Wed 11/48:40 pm
OPO
-
PDX
2 stops32h 40m
Iberia
Deal found 5/11$766
This British Airways deal was found by Cheapflights users on 5/12. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/271:28 pm
PDX
-
OPO
2 stops21h 17m
British Airways
Wed 11/48:40 pm
OPO
-
PDX
2 stops32h 40m
British Airways
Deal found 5/12$767
This British Airways deal was found by Cheapflights users on 5/15. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:55 am
PDX
-
OPO
2 stops23h 35m
British Airways
Tue 10/208:20 am
OPO
-
PDX
2 stops22h 39m
British Airways
Deal found 5/15$785
This FlightHub deal was found by Cheapflights users on 5/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1710:00 am
PDX
-
OPO
2 stops47h 00m
Scandinavian Airlines
Mon 11/3011:55 am
OPO
-
PDX
2 stops42h 31m
Scandinavian Airlines
Deal found 5/12$790
This British Airways deal was found by Cheapflights users on 5/15. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:55 am
PDX
-
OPO
2 stops23h 35m
British Airways
Mon 10/268:40 pm
OPO
-
PDX
2 stops32h 17m
British Airways
Deal found 5/15$796
This United Airlines deal was found by Cheapflights users on 5/14. 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 10/2510:00 am
PDX
-
OPO
1 stop16h 30m
United Airlines
Wed 11/46:00 am
OPO
-
PDX
2 stops22h 49m
United Airlines
Deal found 5/14$802
This United Airlines deal was found by Cheapflights users on 5/14. 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.
Mon 10/264:29 pm
PDX
-
OPO
2 stops34h 01m
United Airlines
Thu 11/56:00 am
OPO
-
PDX
2 stops24h 38m
United Airlines
Deal found 5/14$807
This United Airlines deal was found by Cheapflights users on 5/14. 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.
Sat 10/2410:35 pm
PDX
-
OPO
1 stop27h 55m
United Airlines
Fri 11/66:00 am
OPO
-
PDX
2 stops24h 38m
United Airlines
Deal found 5/14$809
This United Airlines deal was found by Cheapflights users on 5/14. 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 10/2510:00 am
PDX
-
OPO
1 stop16h 30m
United Airlines
Thu 11/512:35 pm
OPO
-
PDX
1 stop16h 46m
United Airlines
Deal found 5/14$811
This KAYAK deal was found by Cheapflights users on 5/14. 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.
Wed 10/281:39 pm
PDX
-
OPO
2 stops21h 51m
SWISS
Tue 11/312:05 pm
OPO
-
PDX
2 stops40h 28m
SWISS
Deal found 5/14$814

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 May 16, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$707
(Lufthansa)

One-way from

$323
(Kiwi.com)

Popular in

October

Cheapest in

January

Average price

$1,189
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. 7% potential increase in price ($76 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 16, 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 10/13

11:55 am-7:30 pm

2 stops23h 35m

Porto

Tue 10/20

8:20 am-10:59 pm

2 stops22h 39m

$785

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/4

10:00 am-9:30 am

1 stop15h 30m

Porto

Fri 11/13

6:00 am-9:21 pm

2 stops23h 21m

$802
Quickest round-trip

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 10/30

10:00 am-9:30 am

1 stop16h 30m

Porto

Fri 11/13

12:35 pm-9:21 pm

1 stop16h 46m

$861

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 10/13

7:00 am-10:30 am

1 stop19h 30m

Porto

Tue 10/20

11:35 am-11:10 am

1 stop31h 35m

$874

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 9/26

10:35 pm-7:00 am

2 stops48h 25m

Porto

Fri 10/16

12:35 pm-9:13 pm

1 stop16h 38m

$874

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 8/17

7:00 am-10:30 am

1 stop19h 30m

Porto

Mon 9/7

4:20 pm-11:10 am

1 stop26h 50m

$904

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 10/23

5:00 am-7:10 am

2 stops18h 10m

Porto

Mon 11/2

12:35 pm-9:21 pm

1 stop16h 46m

$914

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 8/17

10:56 am-9:45 am

1 stop14h 49m

Porto

Mon 9/7

7:20 pm-11:09 pm

2 stops35h 49m

$915

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 7/21

10:52 pm-6:55 am

1 stop24h 03m

Porto

Wed 7/29

11:20 am-9:34 am

2 stops30h 14m

$931

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 9/2

5:00 am-7:00 am

2 stops18h 00m

Porto

Thu 9/17

9:00 am-10:53 pm

2 stops21h 53m

$931

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/12

Showing 1-10 of 18 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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice 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?

To ensure you get the cheapest price possible for a flight from Portland to Porto, you should look to book at least 38 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 $484). Flying from Portland to Porto in October is currently the most expensive (average of $1,205). 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 May 16, 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
8,455 reviews

Food

7.2

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.9
Good
8,455 reviews
Delta
7.9
Good
8,455 reviews

Food

7.2

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
KLM
7.8
Good
1,517 reviews
Delta
7.9
Good
8,455 reviews

Food

7.2

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
9,727 reviews
Delta
7.9
Good
8,455 reviews

Food

7.2

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 15h 30m. British Airways provides one of the quickest options available for as low as $802. 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 45% 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 $474 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 $484). Flying from Portland to Porto in October is currently the most expensive (average of $1,205). 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.
Portland to Lisbon flights
Boise to Lisbon flights
Redmond to Lisbon flights
Portland to Faro flights
Eugene to Lisbon 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 May 16, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$494Average$1,038FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$498Average$892FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$502Average$1,150FlexibilityNo cancel feeOn-time69%

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