HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$256+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Aug 14 — Aug 211
Fri 8/14
Fri 8/21
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 July 15, 2026.

This Air France deal was found by Cheapflights users on 7/12. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/17:00 am
PDX
-
OPO
1 stop18h 05m
Multiple Airlines
Wed 11/115:00 am
OPO
-
PDX
1 stop14h 20m
Multiple Airlines
Deal found 7/12$733
This Delta deal was found by Cheapflights users on 7/12. 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 11/21:20 pm
PDX
-
OPO
1 stop25h 10m
Delta
Wed 11/115:00 am
OPO
-
PDX
1 stop14h 20m
Delta
Deal found 7/12$737
This Delta deal was found by Cheapflights users on 7/12. 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.
Sat 10/3110:05 pm
PDX
-
OPO
1 stop28h 00m
Delta
Wed 11/115:00 am
OPO
-
PDX
1 stop14h 20m
Delta
Deal found 7/12$744
This United Airlines deal was found by Cheapflights users on 7/12. 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.
Sun 11/17:07 pm
PDX
-
OPO
2 stops30h 23m
United Airlines
Wed 11/116:00 am
OPO
-
PDX
2 stops25h 12m
United Airlines
Deal found 7/12$745
This United Airlines deal was found by Cheapflights users on 7/12. 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.
Sat 11/142:30 pm
PDX
-
OPO
2 stops35h 00m
United Airlines
Wed 11/1812:35 pm
OPO
-
PDX
2 stops38h 32m
United Airlines
Deal found 7/12$751
This Justfly.com deal was found by Cheapflights users on 7/15. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:35 pm
PDX
-
OPO
2 stops43h 50m
Multiple Airlines
Tue 11/107:20 pm
OPO
-
PDX
2 stops35h 52m
Multiple Airlines
Deal found 7/15$755
This KLM deal was found by Cheapflights users on 7/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/307:00 am
PDX
-
OPO
1 stop18h 05m
KLM
Wed 11/115:00 am
OPO
-
PDX
1 stop14h 20m
KLM
Deal found 7/12$783
This Delta deal was found by Cheapflights users on 7/12. 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.
Thu 10/2910:50 pm
PDX
-
OPO
2 stops26h 15m
Delta
Wed 11/115:00 am
OPO
-
PDX
1 stop14h 20m
Delta
Deal found 7/12$787
This FlightHub deal was found by Cheapflights users on 7/11. 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.
Fri 10/237:02 am
PDX
-
OPO
2 stops16h 08m
Multiple Airlines
Mon 11/27:20 pm
OPO
-
PDX
2 stops35h 52m
Multiple Airlines
Deal found 7/11$796

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 July 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$733
(Air France)

One-way from

$256
(Kiwi.com)

Popular in

October

Cheapest in

January

Average price

$1,199
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. 5% potential increase in price ($54 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 July 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 July 15, 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

Sat 11/14

2:30 pm-9:30 am

2 stops35h 00m

Porto

Wed 11/18

12:35 pm-7:07 pm

2 stops38h 32m

$751

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 8/17

11:15 am-9:45 am

1 stop14h 30m

Porto

Mon 8/31

7:20 pm-10:45 pm

2 stops35h 25m

$863

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 9/28

11:54 am-3:25 pm

2 stops19h 31m

Porto

Fri 10/9

5:00 am-5:04 pm

2 stops20h 04m

$866
Quickest round-trip

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 10/16

11:40 am-3:25 pm

2 stops19h 45m

Porto

Sat 10/24

5:00 am-11:10 am

1 stop14h 10m

$877

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 9/14

10:10 am-7:00 am

2 stops36h 50m

Porto

Tue 9/22

8:40 am-7:11 pm

2 stops18h 31m

$897

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 9/14

10:56 am-9:45 am

1 stop14h 49m

Porto

Tue 9/22

12:15 pm-11:28 am

2 stops31h 13m

$907

PortlandPorto

PDX - OPO

PDXOPO

Portland

Mon 8/17

11:15 am-9:45 am

1 stop14h 30m

Porto

Mon 9/7

7:20 pm-8:21 pm

2 stops33h 01m

$912
Cheapest one-way

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 10/14

7:30 pm-10:25 am

1 stop30h 55m

$350

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 10/14

7:00 am-3:25 pm

2 stops24h 25m

$350

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 8/25

3:30 pm-11:05 am

3 stops35h 35m

$350

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/14

Showing 1-10 of 16 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 July.
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

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 July 15, 2026.
See what other customers who have flown with KLM,Delta, 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.
KLM
7.8
Good
1,539 reviews

Food

7.3

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
KLM
7.8
Good
1,539 reviews
KLM
7.8
Good
1,539 reviews

Food

7.3

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Delta
7.8
Good
8,473 reviews
KLM
7.8
Good
1,539 reviews

Food

7.3

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
United Airlines
7.4
Good
9,990 reviews
KLM
7.8
Good
1,539 reviews

Food

7.3

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

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 10m. Delta provides one of the quickest options available for as low as $737. 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, 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 $533, 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

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
Redmond to Lisbon flights
Boise to Lisbon flights
Eugene to Lisbon flights
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 July 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$494Average$1,113FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$498Average$898FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$502Average$1,179FlexibilityNo 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.