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$308+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Porto are usually found in November or February, booked 76 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 September 11, 2025.

Round-trip from

$552
(Surpr!ce)

One-way from

$308
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$1,032
From Portland to Porto
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One-way flight from Portland to Porto
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Highest demand for flights based on searches. 24% potential increase in price ($333 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/196:00 amPDX - OPO
3 stops19h 30mUnited Airlines
Wed 11/2612:30 pmOPO - PDX
2 stops19h 56mUnited Airlines
Deal found 9/11$564
This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1511:59 pmPDX - OPO
2 stops25h 31mUnited Airlines
Wed 11/2612:35 pmOPO - PDX
1 stop17h 35mUnited Airlines
Deal found 9/11$567
This United Airlines deal was found by Cheapflights users on 9/8. 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 11/47:00 amPDX - OPO
2 stops18h 30mUnited Airlines
Tue 11/1112:30 pmOPO - PDX
2 stops40h 08mUnited Airlines
Deal found 9/8$583
This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/177:00 amPDX - OPO
2 stops18h 30mUnited Airlines
Mon 11/246:00 amOPO - PDX
2 stops48h 33mUnited Airlines
Deal found 9/11$584
This KLM deal was found by Cheapflights users on 9/8. 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.
Tue 11/49:58 amPDX - OPO
2 stops16h 32mKLM
Tue 11/119:55 amOPO - PDX
1 stop33h 30mKLM
Deal found 9/8$600
This United Airlines deal was found by Cheapflights users on 9/10. 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 9/309:55 amPDX - OPO
1 stop15h 50mUnited Airlines
Fri 1/3012:30 pmOPO - PDX
2 stops20h 13mUnited Airlines
Deal found 9/10$605
This KAYAK deal was found by Cheapflights users on 9/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/188:30 amPDX - OPO
2 stops20h 20mLufthansa
Mon 11/2412:30 pmOPO - PDX
2 stops43h 56mLufthansa
Deal found 9/11$607
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/167:05 amPDX - OPO
2 stops19h 25mDelta
Mon 11/2411:25 amOPO - PDX
2 stops41h 22mDelta
Deal found 9/11$610
This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2811:59 pmPDX - OPO
2 stops25h 31mUnited Airlines
Fri 12/126:00 amOPO - PDX
2 stops24h 15mUnited Airlines
Deal found 9/11$614
This United Airlines deal was found by Cheapflights users on 9/8. 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 11/126:00 amPDX - OPO
3 stops19h 30mUnited Airlines
Sun 11/1612:35 pmOPO - PDX
3 stops30h 18mUnited Airlines
Deal found 9/8$617
This KLM deal was found by Cheapflights users on 9/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/171:25 pmPDX - OPO
1 stop21h 15mKLM
Tue 11/259:55 amOPO - PDX
1 stop33h 30mKLM
Deal found 9/11$622

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 September 11, 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

Mon 11/17

11:59 pm-9:30 am

2 stops25h 31m

Porto

Tue 11/25

12:30 pm-12:26 am

2 stops19h 56m

$564

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sat 11/15

11:59 pm-9:30 am

2 stops25h 31m

Porto

Tue 11/25

12:30 pm-12:26 am

2 stops19h 56m

$564

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 11/18

8:30 am-9:30 am

2 stops17h 00m

Porto

Tue 11/25

12:30 pm-12:26 am

2 stops19h 56m

$564

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

5:00 am-9:30 am

2 stops20h 30m

Porto

Wed 11/26

12:30 pm-12:26 am

2 stops19h 56m

$564

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/19

5:00 am-9:30 am

2 stops20h 30m

Porto

Tue 11/25

12:35 pm-10:10 pm

1 stop17h 35m

$567

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 11/18

5:00 am-9:30 am

2 stops20h 30m

Porto

Wed 11/26

12:35 pm-10:53 am

3 stops30h 18m

$567

PortlandPorto

PDX - OPO

PDXOPO

Portland

Wed 11/19

5:00 am-9:30 am

2 stops20h 30m

Porto

Wed 11/26

12:35 pm-10:10 pm

1 stop17h 35m

$567

PortlandPorto

PDX - OPO

PDXOPO

Portland

Tue 11/4

7:00 am-9:30 am

2 stops18h 30m

Porto

Tue 11/11

12:30 pm-8:38 pm

2 stops40h 08m

$583

PortlandPorto

PDX - OPO

PDXOPO

Portland

Sun 11/16

7:05 am-10:30 am

2 stops19h 25m

Porto

Mon 11/24

11:25 am-8:47 pm

2 stops41h 22m

$610

PortlandPorto

PDX - OPO

PDXOPO

Portland

Fri 11/28

7:00 am-9:30 am

2 stops18h 30m

Porto

Fri 12/12

6:00 am-10:15 pm

2 stops24h 15m

$614

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 15 results
1
2

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 August 29, 2025.

To ensure you get the cheapest price possible for a flight from Portland to Porto, you should look to book at least 76 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 $523). Flying from Portland to Porto in June is currently the most expensive (average of $1,027). 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 September 11, 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 15% 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 September 11, 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
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,385 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 31m. United Airlines provides one of the quickest options available for as low as $564. 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), Delta ($709), and KLM ($760) offers the cheapest pricing from Portland to Porto. United Airlines is currently priced 37% 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, January is the cheapest month in which you can book a flight from Portland to Porto (average of $523). Flying from Portland to Porto in June is currently the most expensive (average of $1,027). 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

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
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Eugene to Lisbon flights
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Eugene to Porto flights
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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$647Average$1,089FlexibilityNo cancel feeOn-time69%
DeltaCheapest$709Average$1,090FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$760Average$1,088FlexibilityNo cancel feeOn-time75%

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