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$399+ Cheap flights from Portland, ME (PWM) 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — OPO
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
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 28, 2026.

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.
Fri 1/302:31 pm
PWM
-
OPO
2 stops16h 09m
United Airlines
Tue 2/36:00 am
OPO
-
PWM
2 stops37h 31m
United Airlines
Deal found 1/25$779
This oojo deal was found by Cheapflights users on 1/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/202:18 pm
PWM
-
OPO
2 stops22h 42m
Royal Air Maroc
Sat 9/512:15 pm
OPO
-
PWM
2 stops16h 21m
Royal Air Maroc
Deal found 1/27$3,209
This Air Canada deal was found by Cheapflights users on 1/27. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/203:15 pm
PWM
-
OPO
3 stops18h 45m
Air Canada
Sat 9/59:00 am
OPO
-
PWM
3 stops18h 57m
Air Canada
Deal found 1/27$4,487
This United Airlines deal was found by Cheapflights users on 1/27. 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.
Thu 8/203:15 pm
PWM
-
OPO
1 stop10h 40m
United Airlines
Sat 9/56:00 am
OPO
-
PWM
2 stops18h 24m
United Airlines
Deal found 1/27$4,753
This Air Canada deal was found by Cheapflights users on 1/27. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:20 pm
PWM
-
OPO
2 stops31h 30m
Multiple Airlines
Sat 9/59:00 am
OPO
-
PWM
3 stops18h 57m
Multiple Airlines
Deal found 1/27$4,764

Find flight deals from Portland to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) 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 28, 2026.

Most accurate provider

Ovago
2 stars

Most trusted provider

Ovago
3 stars
Provider with most accurate pricing for Portland-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Porto flights.
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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 28, 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

PWM - OPO

PWMOPO

Portland

Tue 2/24

2:10 pm-9:30 am

2 stops14h 20m

$399

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 3/1

5:45 am-9:30 am

2 stops22h 45m

$425

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 2/24

6:14 pm-2:55 pm

3 stops39h 41m

$498

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 3/1

6:00 am-11:55 am

1 stop24h 55m

$772

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 3/1

6:00 am-11:40 am

3 stops24h 40m

$1,539

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

  • Most accurate provider: When it comes to deals on Portland, Maine-Porto flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Portland, Maine-Porto flight deals on Cheapflights vs. Ovago 90-95% of the time. Price accuracy is based on data collected from Portland, Maine-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland, Maine-Porto flights, Cheapflights users trust Ovago the most. Ovago 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, Maine-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, Maine to Porto?

Currently, March is the cheapest month in which you can book a flight from Portland, Maine to Porto (average of $361). Flying from Portland, Maine to Porto in June is currently the most expensive (average of $565). 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.

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.

  • 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, Maine to Porto?

    Currently, March is the cheapest month in which you can book a flight from Portland, Maine to Porto (average of $361). Flying from Portland, Maine to Porto in June is currently the most expensive (average of $565). 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

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