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$429+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — OPO
ene. 14 — ene. 211
mié. 1/14
mié. 1/21
1 adult, Economy
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Cheap flight deals from Portland to Porto

Best flights from Portland to Porto
Discover carefully curated flight deals from Portland to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated diciembre 15, 2025.

This KLM deal was found by Cheapflights users on 12/13. 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.
vie. 1/232:35 pmPWM - OPO
2 stops14h 55mMultiple Airlines
mar. 1/279:55 amOPO - PWM
2 stops19h 25mMultiple Airlines
Deal found 12/13$492
This United Airlines deal was found by Cheapflights users on 12/13. 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.
vie. 1/232:31 pmPWM - OPO
2 stops16h 09mUnited Airlines
mar. 1/276:00 amOPO - PWM
2 stops17h 52mUnited Airlines
Deal found 12/13$506

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 diciembre 15, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$492
(KLM)

One-way from

$429
(Delta)

Popular in

June

Cheapest in

November

Average price

$659
Provider with most accurate pricing for Boston Logan Intl-Porto flight deals.
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Provider most trusted by Cheapflights users for Boston Logan Intl-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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Highest demand for flights based on searches. 15% potential increase in price ($117 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 diciembre 15, 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

vie. 1/23

2:35 pm-10:30 am

2 stops14h 55m

Porto

mar. 1/27

9:55 am-12:20 am

2 stops19h 25m

$492

PortlandPorto

PWM - OPO

PWMOPO

Portland

vie. 1/23

2:31 pm-11:40 am

2 stops16h 09m

Porto

mar. 1/27

6:00 am-6:52 pm

2 stops17h 52m

$506

PortlandPorto

PWM - OPO

PWMOPO

Portland

dom. 3/1

2:35 pm-3:25 pm

2 stops19h 50m

$429

PortlandPorto

PWM - OPO

PWMOPO

Portland

dom. 3/1

6:00 am-11:10 am

3 stops24h 10m

$618

PortlandPorto

PWM - OPO

PWMOPO

Portland

dom. 3/1

6:00 am-11:55 am

1 stop24h 55m

$771

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

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, October is the cheapest month in which you can book a flight from Portland, Maine to Porto (average of $369). Flying from Portland, Maine to Porto in June is currently the most expensive (average of $555). 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.

  • How long is the flight from Portland, Maine to Porto?

    For as low as $506, United Airlines can have you in Porto from Portland, Maine in 16h 09m. Portland, Maine and Porto are separated by a distance of 3071 mi.

  • 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, October is the cheapest month in which you can book a flight from Portland, Maine to Porto (average of $369). Flying from Portland, Maine to Porto in June is currently the most expensive (average of $555). 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
Vila Nova de Gaia

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