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Cheap flights from Portland, Maine to Porto from $778

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 6/26. 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
3:46 pm - 6:55 am
PWM
-
OPO
10h 09m
1 stop
United Airlines Logo
12:10 pm - 11:51 pm
OPO
-
PWM
40h 41m
2 stops
$949United Airlines
Mon, Jul 13 - Mon, Jul 20
United Airlines Logo
6:00 am - 7:00 am
PWM
-
OPO
20h 00m
2 stops
United Airlines Logo
6:00 am - 9:41 pm
OPO
-
PWM
44h 41m
2 stops
$952United Airlines
Mon, Jul 13 - Mon, Jul 20
United Airlines Logo
10:55 am - 6:55 am
PWM
-
OPO
15h 00m
1 stop
United Airlines Logo
9:00 am - 11:30 pm
OPO
-
PWM
19h 30m
1 stop
$1,005United Airlines
Mon, Jul 13 - Mon, Jul 20
Air France Logo
2:59 pm - 3:25 pm
PWM
-
OPO
19h 26m
2 stops
Air France Logo
5:55 am - 5:52 pm
OPO
-
PWM
16h 57m
2 stops
$19,195Air France
Fri, Jun 26 - Fri, Jul 3

United Airlines flights from Portland, Maine to Porto

Our best United Airlines deals on Portland, Maine to Porto flight tickets
United Airlines
Jul 13
PWM3:46 pmPortland
10h 09m
1 stop
OPO6:55 amPorto
Jul 20
OPO12:10 pmPorto
40h 41m
2 stops
PWM11:51 pmPortland
$949
United Airlines
Jul 13
PWM6:00 amPortland
20h 00m
2 stops
OPO7:00 amPorto
Jul 20
OPO6:00 amPorto
44h 41m
2 stops
PWM9:41 pmPortland
$952
United Airlines
Jul 13
PWM10:55 amPortland
15h 00m
1 stop
OPO6:55 amPorto
Jul 20
OPO9:00 amPorto
19h 30m
1 stop
PWM11:30 pmPortland
$1,005

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 May 31, 2026.
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

Cheapest round-trip

PortlandPorto

PWM - OPO

PWMOPO

Portland

Mon 7/13

3:46 pm-6:55 am

1 stop10h 09m

Porto

Mon 7/20

12:10 pm-11:51 pm

2 stops40h 41m

$949

PortlandPorto

PWM - OPO

PWMOPO

Portland

Mon 7/13

6:00 am-7:00 am

2 stops20h 00m

Porto

Mon 7/20

6:00 am-9:41 pm

2 stops44h 41m

$952
Quickest round-trip

PortlandPorto

PWM - OPO

PWMOPO

Portland

Mon 7/13

10:55 am-6:55 am

1 stop15h 00m

Porto

Mon 7/20

9:00 am-11:30 pm

1 stop19h 30m

$1,005

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 6/26

2:59 pm-3:25 pm

2 stops19h 26m

Porto

Fri 7/3

5:55 am-5:52 pm

2 stops16h 57m

$19,195
Cheapest one-way

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 6/26

6:13 pm-11:20 pm

3 stops48h 07m

$778

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 6/26

6:00 am-11:15 am

2 stops24h 15m

$824
Quickest one-way

PortlandPorto

PWM - OPO

PWMOPO

Portland

Fri 6/26

10:48 am-6:55 am

1 stop15h 07m

$917

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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?

Royal Air Maroc and Lufthansa are the most popular carriers operating from Portland to Porto

What airlines fly to Porto?

TAP AIR PORTUGAL, Iberia and United 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 79% 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

Fastest flight time

10h 09m

Direct flights

None
The fastest flight from Portland, Maine to Porto takes 10h 09m
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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Frequently asked questions about flying from Portland, Maine to Porto

  • How far is Portland to Porto by plane?

    Porto is 3072.7 mi away from Portland. Typically, this will take 10h 09m 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
Braga
Matosinhos
Lamego
Chaves
Esposende
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Curia
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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Tue 6/30
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