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Cheap flights from Portland, Maine to Porto from $447

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to Porto departing on 3/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Portland, Maine to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
7:10 pm - 9:30 amPWM-OPO
10h 20m1 stop
United Airlines Logo
6:00 am - 6:47 pmOPO-PWM
17h 47m2 stops
$863United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
5:45 am - 9:30 amPWM-OPO
23h 45m2 stops
United Airlines Logo
6:00 am - 6:47 pmOPO-PWM
17h 47m2 stops
$897United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
Turkish Airlines Logo
2:20 pm - 3:40 pmPWM-OPO
44h 20m2 stops
Turkish Airlines Logo
10:40 am - 11:36 pmOPO-PWM
41h 56m2 stops
$966Turkish Airlines
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Wed, Apr 1 - Sun, Apr 5
United Airlines Logo
7:10 pm - 9:30 amPWM-OPO
10h 20m1 stop
United Airlines Logo
12:35 pm - 6:47 pmOPO-PWM
11h 12m1 stop
$986United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
Delta Logo
6:30 am - 6:10 pmPWM-OPO
30h 40m2 stops
Delta Logo
11:25 am - 11:49 pmOPO-PWM
17h 24m2 stops
$1,044Delta
Find Deal
Wed, Apr 1 - Sun, Apr 5
United Airlines Logo
10:05 am - 9:45 amPWM-OPO
18h 40m2 stops
United Airlines Logo
12:35 pm - 6:47 pmOPO-PWM
11h 12m1 stop
$1,308United Airlines
Find Deal
Wed, Apr 1 - Sun, Apr 5
Delta Logo
5:45 am - 10:25 pmPWM-OPO
35h 40m2 stops
Delta Logo
11:15 am - 10:43 pmOPO-PWM
40h 28m2 stops
$1,331Delta
Find Deal
Wed, Dec 24 - Tue, Dec 30
Delta Logo
5:45 am - 10:25 pmPWM-OPO
35h 40m2 stops
Delta Logo
6:00 am - 12:20 pmOPO-PWM
35h 20m2 stops
$1,338Delta
Find Deal
Wed, Dec 24 - Wed, Dec 31
Delta Logo
5:45 am - 10:25 pmPWM-OPO
35h 40m2 stops
Delta Logo
11:15 am - 12:20 pmOPO-PWM
54h 05m2 stops
$1,373Delta
Find Deal
Wed, Dec 24 - Mon, Dec 29
Delta Logo
1:03 pm - 10:30 amPWM-OPO
16h 27m2 stops
Delta Logo
11:15 am - 12:20 pmOPO-PWM
54h 05m2 stops
$1,388Delta
Find Deal
Thu, Dec 25 - Wed, Dec 31

Delta flights from Portland, Maine to Porto

Our best Delta deals on Portland, Maine to Porto flight tickets
Delta
Feb 18
PWM2:35 pmPortland
14h 55m
2 stops
OPO10:30 amPorto
Feb 26
OPO11:15 amPorto
40h 49m
2 stops
PWM11:04 pmPortland
$492
Find similar
Delta
Feb 17
PWM12:15 pmPortland
41h 15m
2 stops
OPO10:30 amPorto
Feb 26
OPO11:15 amPorto
40h 49m
2 stops
PWM11:04 pmPortland
$493
Find similar
Delta
Feb 15
PWM6:30 amPortland
23h 00m
2 stops
OPO10:30 amPorto
Feb 26
OPO11:15 amPorto
40h 49m
2 stops
PWM11:04 pmPortland
$498
Find similar

KLM flights from Portland, Maine to Porto

Our best KLM deals on Portland, Maine to Porto flight tickets
KLM
Feb 17
PWM12:15 pmPortland
17h 15m
2 stops
OPO10:30 amPorto
Feb 27
OPO11:20 amPorto
18h 00m
2 stops
PWM12:20 amPortland
$597
Find similar
KLM
Feb 17
PWM12:15 pmPortland
17h 15m
2 stops
OPO10:30 amPorto
Feb 28
OPO6:00 amPorto
23h 20m
2 stops
PWM12:20 amPortland
$641
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine 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, momondo users made 832,500 searches. Data last updated November 13, 2025.
Use the filters below to find and compare flights from Portland, Maine to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 3/27

7:10 pm-9:30 am

1 stop10h 20m

Porto

Tue 3/31

6:00 am-6:47 pm

2 stops17h 47m

$863

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 3/27

5:45 am-9:30 am

2 stops23h 45m

Porto

Tue 3/31

6:00 am-6:47 pm

2 stops17h 47m

$897

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 4/1

2:20 pm-3:40 pm

2 stops44h 20m

Porto

Sun 4/5

10:40 am-11:36 pm

2 stops41h 56m

$966

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 3/27

7:10 pm-9:30 am

1 stop10h 20m

Porto

Tue 3/31

12:35 pm-6:47 pm

1 stop11h 12m

$986

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 4/1

6:30 am-6:10 pm

2 stops30h 40m

Porto

Sun 4/5

11:25 am-11:49 pm

2 stops17h 24m

$1,044

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 4/1

10:05 am-9:45 am

2 stops18h 40m

Porto

Sun 4/5

12:35 pm-6:47 pm

1 stop11h 12m

$1,308

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 12/24

5:45 am-10:25 pm

2 stops35h 40m

Porto

Tue 12/30

11:15 am-10:43 pm

2 stops40h 28m

$1,331

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 12/24

5:45 am-10:25 pm

2 stops35h 40m

Porto

Wed 12/31

6:00 am-12:20 pm

2 stops35h 20m

$1,338

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 12/24

5:45 am-10:25 pm

2 stops35h 40m

Porto

Mon 12/29

11:15 am-12:20 pm

2 stops54h 05m

$1,373

PortlandPorto

PWM - OPO

PWMOPO

Portland

Thu 12/25

1:03 pm-10:30 am

2 stops16h 27m

Porto

Wed 12/31

11:15 am-12:20 pm

2 stops54h 05m

$1,388

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to Porto from

How to get the cheapest flight ticket from Portland, Maine to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Portland to Porto?

KLM and Air Canada are the most popular carriers operating from Portland to Porto

What airlines fly to Porto?

TAP AIR PORTUGAL, Iberia and Azores Airlines are the top three most popular airlines that fly to Porto from Portland, Maine according to our data. TAP AIR PORTUGAL is the first choice among our users, with 73% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 11 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

When to book flights from Portland, Maine to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to Porto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland, Maine to Porto (PWM to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to Porto

Direct flights

None
There are no direct flights from Portland, Maine to Porto. There are no popular flight routes from Portland, Maine to Porto.
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  • How far is Portland to Porto by plane?

    Porto is 3072.7 mi away from Portland. Typically, this will take 10h 20m by plane in normal conditions.

  • When did momondo last update prices for flights from Portland Airport to Porto Airport?

    Prices for flights from Portland Airport to Porto Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Portland Airport to Porto Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The necessary travel and health documents for your Porto Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Aveiro
Matosinhos
Braga
Lamego
Guimarães
Esposende
Chaves
Espinho
Viseu
Ponte de Lima
Arcos de Valdevez
Pinhao
Curia
Penafiel
Mesao Frio
Mira
Baiao

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Porto?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Portland to Porto. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Portland to Porto with flexible booking policies on momondo?

All flight searches from Portland to Porto on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Portland to Porto?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Portland to Porto.

I’m not ready to book a flight from Portland to Porto right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Porto from Portland. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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