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$668+ 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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — OPO
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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Cheap 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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
2 stars

Round-trip from

$832
(United Airlines)

One-way from

$668
(United Airlines)
Provider with most accurate pricing for Portland-Porto flight deals.
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Provider most trusted by Cheapflights users for Portland-Porto flights.
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From Portland to Porto
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One-way flight from Portland to Porto
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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 April 17, 2025.

This United Airlines deal was found by Cheapflights users on 4/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/193:15 pmPWM - OPO
1 stop10h 35mUnited Airlines
Sun 10/56:00 amOPO - PWM
2 stops22h 54mUnited Airlines
Deal found 4/15$832
This Air Canada deal was found by Cheapflights users on 4/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/197:26 pmPWM - OPO
2 stops33h 09mMultiple Airlines
Sun 10/510:00 amOPO - PWM
3 stops18h 01mMultiple Airlines
Deal found 4/15$1,973
This Air Canada deal was found by Cheapflights users on 4/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/193:15 pmPWM - OPO
3 stops18h 40mAir Canada
Sun 10/510:00 amOPO - PWM
3 stops18h 01mAir Canada
Deal found 4/15$2,189

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 April 17, 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

PWM - OPO

PWMOPO

Portland

Fri 9/19

3:15 pm-6:50 am

1 stop10h 35m

Porto

Sun 10/5

6:00 am-11:54 pm

2 stops22h 54m

$832

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 9/19

7:26 pm-9:35 am

2 stops33h 09m

Porto

Sun 10/5

10:00 am-11:01 pm

3 stops18h 01m

$1,973

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 9/19

3:15 pm-2:55 pm

3 stops18h 40m

Porto

Sun 10/5

10:00 am-11:01 pm

3 stops18h 01m

$2,189

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 9/19

3:15 pm-6:50 am

1 stop10h 35m

$668

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

  • Most accurate provider: When it comes to deals on Portland, Maine-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-Porto flight deals on Cheapflights vs. FlightHub >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 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, 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, January is the cheapest month in which you can book a flight from Portland, Maine to Porto (average of $523). Flying from Portland, Maine to Porto in June is currently the most expensive (average of $1,081). 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 PWM 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 April 17, 2025.

When flying from Portland, Maine to Porto, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Porto by month

Plan your trip to Porto by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

Plan your trip to Porto by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

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 April 17, 2025.
United Airlines
7.4
Good
8,667 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,667 reviews
United Airlines
7.4
Good
8,667 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.0
Good
9,142 reviews
United Airlines
7.4
Good
8,667 reviews

Comfort

7.3

Overall

7.4

Food

6.6

Crew

8.1

Boarding

7.7

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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.

  • What are the cheapest airlines flying from Portland, Maine to Porto round-trip?

    According to our current data, United Airlines ($832), and Air Canada ($2,189) offers the cheapest pricing from Portland, Maine to Porto.

  • 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, January is the cheapest month in which you can book a flight from Portland, Maine to Porto (average of $523). Flying from Portland, Maine to Porto in June is currently the most expensive (average of $1,081). 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 Portland?

Book flights to Portland if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos
Arcos de Valdevez

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