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$313+ 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 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
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 January 26, 2026.

This Air France deal was found by Cheapflights users on 1/24. 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.
Mon 3/210:05 am
PDX
-
OPO
2 stops16h 25m
Multiple Airlines
Mon 3/165:00 am
OPO
-
PDX
1 stop14h 25m
Multiple Airlines
Deal found 1/24$482
This KLM deal was found by Cheapflights users on 1/25. 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.
Sun 4/121:05 pm
PDX
-
OPO
1 stop18h 25m
KLM
Fri 4/245:00 am
OPO
-
PDX
1 stop14h 10m
KLM
Deal found 1/25$483
This Air France deal was found by Cheapflights users on 1/26. 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.
Tue 2/2410:05 am
PDX
-
OPO
2 stops16h 25m
Multiple Airlines
Tue 3/34:10 pm
OPO
-
PDX
1 stop27h 15m
Multiple Airlines
Deal found 1/26$484
This KLM deal was found by Cheapflights users on 1/25. 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.
Mon 3/21:25 pm
PDX
-
OPO
1 stop21h 25m
KLM
Mon 3/165:00 am
OPO
-
PDX
1 stop14h 25m
KLM
Deal found 1/25$485
This Delta deal was found by Cheapflights users on 1/24. 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 2/216:00 am
PDX
-
OPO
2 stops20h 30m
Delta
Fri 3/65:00 am
OPO
-
PDX
1 stop14h 25m
Delta
Deal found 1/24$490
This United Airlines deal was found by Cheapflights users on 1/24. 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 2/2111:59 pm
PDX
-
OPO
2 stops25h 31m
United Airlines
Fri 3/66:00 am
OPO
-
PDX
2 stops21h 14m
United Airlines
Deal found 1/24$492
This Travelocity deal was found by Cheapflights users on 1/25. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/127:49 pm
PDX
-
OPO
2 stops20h 51m
Lufthansa
Wed 3/186:00 am
OPO
-
PDX
2 stops20h 14m
Lufthansa
Deal found 1/25$495
This FlightHub deal was found by Cheapflights users on 1/24. 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 3/103:40 pm
PDX
-
OPO
2 stops47h 45m
Multiple Airlines
Tue 3/177:25 pm
OPO
-
PDX
2 stops34h 20m
Multiple Airlines
Deal found 1/24$496
This United Airlines deal was found by Cheapflights users on 1/25. 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 3/25:05 am
PDX
-
OPO
2 stops20h 25m
United Airlines
Mon 3/1612:30 pm
OPO
-
PDX
2 stops30h 21m
United Airlines
Deal found 1/25$497
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Tue 2/245:05 am
PDX
-
OPO
2 stops20h 25m
United Airlines
Tue 3/312:35 pm
OPO
-
PDX
3 stops32h 03m
United Airlines
Deal found 1/26$500

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 January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$450
(United Airlines)

One-way from

$313
(Kiwi.com)

Popular in

May

Cheapest in

January

Average price

$484
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 ($208 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 26, 2026.
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 2/25

1:25 pm-10:30 am

1 stop13h 05m

Porto

Tue 3/3

4:10 pm-11:25 am

1 stop27h 15m

$485

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 2/21

11:59 pm-9:30 am

2 stops25h 31m

Porto

Fri 3/6

6:00 am-10:45 pm

2 stops24h 45m

$492

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 3/1

12:40 am-3:25 pm

2 stops30h 45m

Porto

Mon 3/16

5:00 am-8:59 pm

2 stops22h 59m

$494

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 2/25

7:00 am-9:30 am

2 stops18h 30m

Porto

Tue 3/3

12:35 pm-12:38 pm

3 stops32h 03m

$500

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 2/24

5:05 am-9:30 am

2 stops20h 25m

Porto

Tue 3/3

12:35 pm-12:38 pm

3 stops32h 03m

$500

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 4/7

1:05 pm-10:15 pm

1 stop25h 10m

Porto

Wed 4/15

7:10 pm-11:10 am

1 stop24h 00m

$583

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 3/10

1:00 pm-2:45 pm

2 stops18h 45m

Porto

Tue 3/17

12:35 pm-9:52 pm

1 stop16h 17m

$586

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 4/8

3:15 pm-11:25 pm

2 stops24h 10m

Porto

Wed 4/22

8:40 am-10:29 pm

2 stops21h 49m

$588

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 4/18

3:30 pm-8:40 pm

3 stops45h 10m

$313

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 3/24

3:45 pm-3:45 pm

2 stops41h 00m

$319

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/23

Showing 1-10 of 14 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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
OvagoPrice 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 Expedia the most. Expedia 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 January 23, 2026.

To ensure you get the cheapest price possible for a flight from Portland to Porto, you should look to book at least 57 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 $970). 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.

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 January 26, 2026.
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
8,111 reviews

Overall

7.9

Food

7.2

Crew

8.5

Comfort

7.9

Entertainment

7.8

Boarding

8.1

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
8,111 reviews
Delta
7.9
Good
8,111 reviews

Overall

7.9

Food

7.2

Crew

8.5

Comfort

7.9

Entertainment

7.8

Boarding

8.1

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
1,442 reviews
Delta
7.9
Good
8,111 reviews

Overall

7.9

Food

7.2

Crew

8.5

Comfort

7.9

Entertainment

7.8

Boarding

8.1

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
9,199 reviews
Delta
7.9
Good
8,111 reviews

Overall

7.9

Food

7.2

Crew

8.5

Comfort

7.9

Entertainment

7.8

Boarding

8.1

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 13h 05m. KLM provides one of the quickest options available for as low as $485. 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 ($591) offers the cheapest pricing from Portland to Porto. Delta is currently priced 47% 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 $535 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 $970). 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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Eugene to Lisbon flights
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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 January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$494Average$957FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$498Average$892FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$644Average$1,045FlexibilityNo cancel feeOn-time69%

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