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$481+ 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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — OPO
May 31 — Jun 71
Sun 5/31
Sun 6/7
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 May 1, 2026.

This United Airlines deal was found by Cheapflights users on 4/29. 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 11/39:10 am
PWM
-
OPO
1 stop19h 20m
United Airlines
Fri 11/66:00 am
OPO
-
PWM
2 stops21h 57m
United Airlines
Deal found 4/29$718
This United Airlines deal was found by Cheapflights users on 4/26. 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 8/910:55 am
PWM
-
OPO
1 stop15h 00m
United Airlines
Tue 8/1812:15 pm
OPO
-
PWM
2 stops30h 39m
United Airlines
Deal found 4/26$954
This FlightHub deal was found by Cheapflights users on 4/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1211:08 am
PWM
-
OPO
2 stops41h 07m
Austrian Airlines
Mon 6/810:10 am
OPO
-
PWM
2 stops37h 25m
Austrian Airlines
Deal found 4/28$1,157
This United Airlines deal was found by Cheapflights users on 4/28. 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 5/1211:08 am
PWM
-
OPO
2 stops23h 37m
United Airlines
Mon 6/812:35 pm
OPO
-
PWM
1 stop15h 55m
United Airlines
Deal found 4/28$1,227
This United Airlines deal was found by Cheapflights users on 4/30. 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 6/145:50 am
PWM
-
OPO
1 stop22h 55m
United Airlines
Sun 6/216:00 am
OPO
-
PWM
2 stops22h 51m
United Airlines
Deal found 4/30$1,233
This Air Canada deal was found by Cheapflights users on 4/29. 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.
Tue 11/33:15 pm
PWM
-
OPO
3 stops17h 15m
Air Canada
Fri 11/68:30 am
OPO
-
PWM
3 stops19h 27m
Air Canada
Deal found 4/29$1,247
This United Airlines deal was found by Cheapflights users on 4/29. 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 6/138:16 pm
PWM
-
OPO
1 stop32h 29m
United Airlines
Sat 6/2012:05 pm
OPO
-
PWM
2 stops40h 46m
United Airlines
Deal found 4/29$1,254

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 May 1, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$954
(United Airlines)

One-way from

$481
(Kiwi.com)
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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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 May 1, 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

Sun 8/9

10:55 am-6:55 am

1 stop15h 00m

Porto

Tue 8/18

12:15 pm-1:54 pm

2 stops30h 39m

$954

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 5/12

11:08 am-9:15 am

2 stops41h 07m

Porto

Mon 6/8

10:10 am-6:35 pm

2 stops37h 25m

$1,157
Quickest round-trip

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 5/12

11:08 am-3:45 pm

2 stops23h 37m

Porto

Mon 6/8

12:35 pm-11:30 pm

1 stop15h 55m

$1,227

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 6/14

5:50 am-9:45 am

1 stop22h 55m

Porto

Sun 6/21

6:00 am-11:51 pm

2 stops22h 51m

$1,233

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sat 6/13

8:16 pm-9:45 am

1 stop32h 29m

Porto

Sat 6/20

12:05 pm-11:51 pm

2 stops40h 46m

$1,254
Cheapest one-way

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 6/9

6:00 am-11:10 am

3 stops48h 10m

$481

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 8/30

6:00 am-6:55 am

1 stop19h 55m

$525

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 6/9

2:59 pm-3:25 pm

2 stops19h 26m

$618

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 8/30

6:30 am-8:35 pm

3 stops33h 05m

$709

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 6/9

2:59 pm-10:30 am

1 stop14h 31m

$850

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

Showing 1-10 of 11 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 >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 $954, United Airlines can have you in Porto from Portland, Maine in 15h. 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.

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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