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$704+ Cheap flights from Portland, ME (PWM) to Porto (OPO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — OPO
Jul 8 — Jul 151
Wed 7/8
Wed 7/15
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 June 8, 2026.

This oojo deal was found by Cheapflights users on 6/7. 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 12/310:00 am
PWM
-
OPO
2 stops25h 55m
Scandinavian Airlines
Mon 12/711:55 am
OPO
-
PWM
2 stops40h 54m
Scandinavian Airlines
Deal found 6/7$704
This United Airlines deal was found by Cheapflights users on 6/7. 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 12/75:06 pm
PWM
-
OPO
1 stop11h 24m
United Airlines
Thu 12/106:00 am
OPO
-
PWM
2 stops17h 13m
United Airlines
Deal found 6/7$718
This United Airlines deal was found by Cheapflights users on 6/7. 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 12/33:15 pm
PWM
-
OPO
1 stop13h 15m
United Airlines
Mon 12/712:35 pm
OPO
-
PWM
2 stops35h 49m
United Airlines
Deal found 6/7$788
This United Airlines deal was found by Cheapflights users on 6/6. 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 7/2110:55 am
PWM
-
OPO
1 stop14h 20m
United Airlines
Tue 7/2812:15 pm
OPO
-
PWM
2 stops40h 36m
United Airlines
Deal found 6/6$914
This United Airlines deal was found by Cheapflights users on 6/7. 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 7/226:00 am
PWM
-
OPO
2 stops20h 00m
United Airlines
Wed 7/2911:20 am
OPO
-
PWM
2 stops41h 31m
United Airlines
Deal found 6/7$918
This Air France deal was found by Cheapflights users on 6/6. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/212:59 pm
PWM
-
OPO
2 stops19h 26m
Multiple Airlines
Tue 7/2811:30 am
OPO
-
PWM
2 stops18h 29m
Multiple Airlines
Deal found 6/6$932
This Air Canada deal was found by Cheapflights users on 6/7. 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.
Wed 7/229:10 am
PWM
-
OPO
3 stops16h 50m
Multiple Airlines
Wed 7/2911:20 am
OPO
-
PWM
2 stops17h 31m
Multiple Airlines
Deal found 6/7$1,076
This United Airlines deal was found by Cheapflights users on 6/6. 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 7/46:00 am
PWM
-
OPO
1 stop19h 55m
United Airlines
Fri 7/1012:05 pm
OPO
-
PWM
2 stops40h 25m
United Airlines
Deal found 6/6$1,079

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 June 8, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$704
(oojo)
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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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 June 8, 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

Thu 12/3

3:15 pm-9:30 am

1 stop13h 15m

Porto

Mon 12/7

12:35 pm-7:24 pm

2 stops35h 49m

$788

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 7/21

10:55 am-6:15 am

1 stop14h 20m

Porto

Tue 7/28

12:15 pm-11:51 pm

2 stops40h 36m

$914

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 7/22

6:00 am-7:00 am

2 stops20h 00m

Porto

Wed 7/29

11:20 am-11:51 pm

2 stops41h 31m

$918

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sat 7/4

6:00 am-6:55 am

2 stops19h 55m

Porto

Fri 7/10

12:05 pm-11:30 pm

2 stops40h 25m

$1,083

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 7/5

3:16 pm-3:40 pm

2 stops19h 24m

Porto

Sat 7/11

12:05 pm-11:51 pm

2 stops40h 46m

$1,178

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 7/21

6:00 am-7:00 am

2 stops20h 00m

Porto

Tue 7/28

10:00 am-11:30 pm

3 stops18h 30m

$1,444
Quickest round-trip

PortlandPorto

PWM - OPO

PWMOPO

Portland

Thu 12/3

3:15 pm-1:30 pm

3 stops17h 15m

Porto

Mon 12/7

11:00 am-10:57 pm

3 stops16h 57m

$1,594

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/7

Sorted by cheapest first
  • 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 >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.

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 $788, United Airlines can have you in Porto from Portland, Maine in 13h 15m. 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.

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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