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$468+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — OPO
Apr 11 — Apr 181
Sat 4/11
Sat 4/18
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 March 12, 2026.

This United Airlines deal was found by Cheapflights users on 3/8. 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.
Fri 11/135:30 am
PWM
-
OPO
2 stops25h 10m
United Airlines
Tue 11/176:00 am
OPO
-
PWM
2 stops22h 59m
United Airlines
Deal found 3/8$637
This oojo deal was found by Cheapflights users on 3/9. 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.
Wed 4/297:28 am
PWM
-
OPO
2 stops45h 12m
Turkish Airlines
Wed 6/310:45 am
OPO
-
PWM
2 stops42h 11m
Turkish Airlines
Deal found 3/9$822
This Delta deal was found by Cheapflights users on 3/11. 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.
Tue 3/242:30 pm
PWM
-
OPO
2 stops16h 00m
Delta
Fri 4/105:55 am
OPO
-
PWM
2 stops22h 27m
Delta
Deal found 3/11$834
This Delta deal was found by Cheapflights users on 3/9. 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.
Mon 4/272:51 pm
PWM
-
OPO
2 stops26h 09m
Delta
Wed 6/35:00 am
OPO
-
PWM
2 stops23h 09m
Delta
Deal found 3/9$871
This Delta deal was found by Cheapflights users on 3/9. 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.
Mon 4/272:51 pm
PWM
-
OPO
2 stops26h 09m
Delta
Fri 6/55:00 am
OPO
-
PWM
2 stops24h 43m
Delta
Deal found 3/9$872
This Delta deal was found by Cheapflights users on 3/9. 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.
Tue 4/2812:46 pm
PWM
-
OPO
2 stops28h 19m
Delta
Tue 6/25:00 am
OPO
-
PWM
2 stops24h 43m
Delta
Deal found 3/9$873
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Sun 4/267:15 pm
PWM
-
OPO
1 stop9h 30m
United Airlines
Wed 6/312:35 pm
OPO
-
PWM
1 stop10h 50m
United Airlines
Deal found 3/9$875

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 March 12, 2026.

Most accurate provider

Ovago
2 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$822
(oojo)

One-way from

$468
(oojo)
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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From Portland to Porto
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One-way flight from Portland to Porto
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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 March 12, 2026.
Use the filters below to find and compare flights from Portland to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 3/24

2:30 pm-10:30 am

2 stops16h 00m

Porto

Fri 4/10

5:55 am-11:22 pm

2 stops22h 27m

$834

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 4/29

7:12 pm-9:45 am

1 stop9h 33m

Porto

Wed 6/3

12:35 pm-6:25 pm

1 stop10h 50m

$875

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sat 4/25

7:15 pm-9:45 am

1 stop9h 30m

Porto

Sat 5/2

6:00 am-6:23 pm

2 stops17h 23m

$877
Quickest round-trip

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 4/26

7:15 pm-9:45 am

1 stop9h 30m

Porto

Mon 6/1

12:35 pm-6:25 pm

1 stop10h 50m

$945

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 4/29

7:12 pm-9:45 am

1 stop9h 33m

Porto

Mon 6/1

9:00 am-11:51 pm

2 stops19h 51m

$949

PortlandPorto

PWM - OPO

PWMOPO

Portland

Mon 4/27

2:51 pm-3:25 pm

2 stops19h 34m

Porto

Sun 5/31

4:25 pm-12:43 am

2 stops37h 18m

$961

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 4/29

7:12 pm-9:45 am

1 stop9h 33m

Porto

Sat 6/6

12:35 pm-6:25 pm

1 stop10h 50m

$1,045

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 3/24

7:07 pm-9:30 am

1 stop10h 23m

Porto

Fri 4/10

12:05 pm-5:32 pm

2 stops58h 27m

$1,070

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sat 4/4

6:00 am-9:45 am

2 stops22h 45m

Porto

Sat 4/11

6:00 am-7:01 pm

2 stops18h 01m

$1,121

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 4/28

6:30 am-6:20 pm

2 stops30h 50m

Porto

Sun 5/31

11:45 am-12:43 am

2 stops17h 58m

$1,137

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 18 resultsSorted by cheapest first
1
2
  • 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, January is the cheapest month in which you can book a flight from Portland, Maine to Porto (average of $354). Flying from Portland, Maine to Porto in June is currently the most expensive (average of $554). 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 $877, Delta can have you in Porto from Portland, Maine in 9h 30m. Portland, Maine and Porto are separated by a distance of 3071 mi. This flight may include one or multiple stops.

  • 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 $354). Flying from Portland, Maine to Porto in June is currently the most expensive (average of $554). 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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