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Cheap flights from Portland, Maine to Porto from $334

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 10/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Portland, Maine to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
2:35 pm - 8:05 am
PWM
-
OPO
13h 30m
1 stop
KLM Logo
5:00 am - 9:01 pm
OPO
-
PWM
21h 01m
2 stops
$718KLM
Wed, Oct 28 - Tue, Nov 3
Delta Logo
10:00 am - 10:35 am
PWM
-
OPO
20h 35m
2 stops
Delta Logo
5:00 am - 9:01 pm
OPO
-
PWM
21h 01m
2 stops
$722Delta
Wed, Oct 28 - Tue, Nov 3
United Airlines Logo
10:48 am - 9:30 am
PWM
-
OPO
17h 42m
1 stop
United Airlines Logo
12:35 pm - 11:23 pm
OPO
-
PWM
15h 48m
1 stop
$726United Airlines
Mon, Nov 16 - Wed, Nov 18
United Airlines Logo
8:47 am - 9:30 am
PWM
-
OPO
19h 43m
2 stops
United Airlines Logo
12:35 pm - 11:23 pm
OPO
-
PWM
15h 48m
1 stop
$730United Airlines
Mon, Nov 16 - Wed, Nov 18
United Airlines Logo
8:47 am - 9:30 am
PWM
-
OPO
19h 43m
2 stops
United Airlines Logo
12:35 pm - 11:23 pm
OPO
-
PWM
15h 48m
1 stop
$731United Airlines
Mon, Nov 16 - Wed, Nov 18
KLM Logo
4:15 pm - 10:30 am
PWM
-
OPO
13h 15m
1 stop
KLM Logo
9:55 am - 11:49 pm
OPO
-
PWM
17h 54m
2 stops
$775KLM
Tue, Oct 20 - Tue, Oct 27
United Airlines Logo
3:31 pm - 9:45 am
PWM
-
OPO
13h 14m
1 stop
United Airlines Logo
12:35 pm - 11:23 pm
OPO
-
PWM
14h 48m
1 stop
$782United Airlines
Wed, Oct 21 - Tue, Oct 27
KLM Logo
4:45 pm - 3:30 pm
PWM
-
OPO
17h 45m
2 stops
KLM Logo
9:55 am - 11:49 pm
OPO
-
PWM
17h 54m
2 stops
$783KLM
Wed, Oct 21 - Tue, Oct 27
Multiple Airlines Logo
4:15 pm - 10:30 am
PWM
-
OPO
13h 15m
1 stop
Multiple Airlines Logo
9:55 am - 11:49 pm
OPO
-
PWM
17h 54m
2 stops
$825Multiple Airlines
Thu, Oct 22 - Tue, Oct 27
Multiple Airlines Logo
4:15 pm - 3:25 pm
PWM
-
OPO
18h 10m
2 stops
Multiple Airlines Logo
9:55 am - 11:49 pm
OPO
-
PWM
17h 54m
2 stops
$829Multiple Airlines
Thu, Oct 22 - Tue, Oct 27

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Air Canada flights from Portland, Maine to Porto

Our best Air Canada deals on Portland, Maine to Porto flight tickets
Air Canada
Oct 5
PWM6:00 amPortland
20h 00m
2 stops
OPO7:00 amPorto
Oct 15
OPO11:40 amPorto
40h 48m
2 stops
PWM11:28 pmPortland
$867
Air Canada
Oct 5
PWM6:00 amPortland
20h 00m
2 stops
OPO7:00 amPorto
Oct 11
OPO11:20 amPorto
37h 40m
2 stops
PWM8:00 pmPortland
$927
Air Canada
Oct 6
PWM6:00 amPortland
20h 00m
2 stops
OPO7:00 amPorto
Oct 14
OPO11:20 amPorto
17h 08m
2 stops
PWM11:28 pmPortland
$941

Delta flights from Portland, Maine to Porto

Our best Delta deals on Portland, Maine to Porto flight tickets
Delta
Oct 28
PWM10:00 amPortland
20h 35m
2 stops
OPO10:35 amPorto
Nov 3
OPO5:00 amPorto
21h 01m
2 stops
PWM9:01 pmPortland
$722
Delta
Oct 5
PWM1:59 pmPortland
15h 31m
1 stop
OPO10:30 amPorto
Oct 14
OPO5:00 amPorto
23h 36m
2 stops
PWM11:36 pmPortland
$876
Delta
Oct 5
PWM1:59 pmPortland
15h 31m
1 stop
OPO10:30 amPorto
Oct 16
OPO5:00 amPorto
24h 10m
2 stops
PWM12:10 amPortland
$877

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 July 18, 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

Wed 10/28

2:35 pm-8:05 am

1 stop13h 30m

Porto

Tue 11/3

5:00 am-9:01 pm

2 stops21h 01m

$718

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 10/28

10:00 am-10:35 am

2 stops20h 35m

Porto

Tue 11/3

5:00 am-9:01 pm

2 stops21h 01m

$722

PortlandPorto

PWM - OPO

PWMOPO

Portland

Mon 11/16

10:48 am-9:30 am

1 stop17h 42m

Porto

Wed 11/18

12:35 pm-11:23 pm

1 stop15h 48m

$726

PortlandPorto

PWM - OPO

PWMOPO

Portland

Mon 11/16

8:47 am-9:30 am

2 stops19h 43m

Porto

Wed 11/18

12:35 pm-11:23 pm

1 stop15h 48m

$730

PortlandPorto

PWM - OPO

PWMOPO

Portland

Mon 11/16

8:47 am-9:30 am

2 stops19h 43m

Porto

Wed 11/18

12:35 pm-11:23 pm

1 stop15h 48m

$731

PortlandPorto

PWM - OPO

PWMOPO

Portland

Tue 10/20

4:15 pm-10:30 am

1 stop13h 15m

Porto

Tue 10/27

9:55 am-11:49 pm

2 stops17h 54m

$775
Quickest round-trip

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 10/21

3:31 pm-9:45 am

1 stop13h 14m

Porto

Tue 10/27

12:35 pm-11:23 pm

1 stop14h 48m

$782

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 10/21

4:45 pm-3:30 pm

2 stops17h 45m

Porto

Tue 10/27

9:55 am-11:49 pm

2 stops17h 54m

$783

PortlandPorto

PWM - OPO

PWMOPO

Portland

Thu 10/22

4:15 pm-10:30 am

1 stop13h 15m

Porto

Tue 10/27

9:55 am-11:49 pm

2 stops17h 54m

$825

PortlandPorto

PWM - OPO

PWMOPO

Portland

Thu 10/22

4:15 pm-3:25 pm

2 stops18h 10m

Porto

Tue 10/27

9:55 am-11:49 pm

2 stops17h 54m

$829

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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?

United Airlines and KLM 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 82% 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

17h 42m

Direct flights

None
The fastest flight from Portland, Maine to Porto takes 17h 42m
There are no direct flights from Portland, Maine to Porto. There are no popular flight routes from Portland, Maine to Porto.
Search flight deals

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 17h 42m 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
Braga
Aveiro
Matosinhos
Lamego
Esposende
Chaves
Pinhao
Arcos de Valdevez
Guimarães
Viseu
Espinho
Ponte de Lima
Mesao Frio
Penafiel
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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