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Cheap flights from Portland, Maine to Porto from $495

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.
1 adult
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.
Delta Logo
5:26 pm - 10:15 pm
PWM
-
OPO
23h 49m
2 stops
Delta Logo
5:00 am - 12:43 am
OPO
-
PWM
24h 43m
2 stops
$569Delta
ter, abr 14 - sex, mai 8
Delta Logo
5:26 pm - 6:20 pm
PWM
-
OPO
19h 54m
2 stops
Delta Logo
11:45 am - 12:46 am
OPO
-
PWM
18h 01m
2 stops
$570Delta
ter, abr 14 - qua, mai 6
United Airlines Logo
10:00 am - 11:15 am
PWM
-
OPO
20h 15m
2 stops
United Airlines Logo
6:00 am - 9:40 pm
OPO
-
PWM
20h 40m
2 stops
$579United Airlines
seg, abr 13 - ter, abr 28
United Airlines Logo
10:00 am - 11:15 am
PWM
-
OPO
20h 15m
2 stops
United Airlines Logo
6:00 am - 2:49 pm
OPO
-
PWM
37h 49m
2 stops
$584United Airlines
seg, abr 13 - ter, mai 5
United Airlines Logo
7:12 pm - 9:45 am
PWM
-
OPO
9h 33m
1 stop
United Airlines Logo
6:00 am - 7:04 pm
OPO
-
PWM
18h 04m
2 stops
$603United Airlines
seg, abr 13 - qui, abr 30
United Airlines Logo
7:12 pm - 9:45 am
PWM
-
OPO
9h 33m
1 stop
United Airlines Logo
6:00 am - 2:49 pm
OPO
-
PWM
37h 49m
2 stops
$609United Airlines
seg, abr 13 - ter, mai 5
Delta Logo
5:26 pm - 6:20 pm
PWM
-
OPO
19h 54m
2 stops
Delta Logo
5:00 am - 12:43 am
OPO
-
PWM
24h 43m
2 stops
$619Delta
ter, abr 14 - sáb, mai 9
United Airlines Logo
7:12 pm - 9:45 am
PWM
-
OPO
9h 33m
1 stop
United Airlines Logo
12:05 pm - 9:40 pm
OPO
-
PWM
38h 35m
2 stops
$624United Airlines
ter, abr 7 - ter, abr 14
United Airlines Logo
6:04 am - 11:15 am
PWM
-
OPO
24h 11m
2 stops
United Airlines Logo
6:00 am - 9:40 pm
OPO
-
PWM
20h 40m
2 stops
$629United Airlines
seg, abr 13 - dom, abr 26
Delta Logo
5:26 pm - 6:20 pm
PWM
-
OPO
19h 54m
2 stops
Delta Logo
5:00 am - 11:24 pm
OPO
-
PWM
23h 24m
2 stops
$634Delta
ter, abr 14 - qui, abr 30

Delta flights from Portland, Maine to Porto

Our best Delta deals on Portland, Maine to Porto flight tickets
Delta
Apr 14
PWM5:26 pmPortland
23h 49m
2 stops
OPO10:15 pmPorto
May 8
OPO5:00 amPorto
24h 43m
2 stops
PWM12:43 amPortland
$569
Delta
Apr 14
PWM5:26 pmPortland
19h 54m
2 stops
OPO6:20 pmPorto
May 6
OPO11:45 amPorto
18h 01m
2 stops
PWM12:46 amPortland
$570
Delta
Apr 14
PWM5:26 pmPortland
19h 54m
2 stops
OPO6:20 pmPorto
May 9
OPO5:00 amPorto
24h 43m
2 stops
PWM12:43 amPortland
$619

United Airlines flights from Portland, Maine to Porto

Our best United Airlines deals on Portland, Maine to Porto flight tickets
United Airlines
Apr 13
PWM10:00 amPortland
20h 15m
2 stops
OPO11:15 amPorto
Apr 28
OPO6:00 amPorto
20h 40m
2 stops
PWM9:40 pmPortland
$579
United Airlines
Apr 13
PWM10:00 amPortland
20h 15m
2 stops
OPO11:15 amPorto
May 5
OPO6:00 amPorto
37h 49m
2 stops
PWM2:49 pmPortland
$584
United Airlines
Apr 13
PWM7:12 pmPortland
9h 33m
1 stop
OPO9:45 amPorto
May 1
OPO6:00 amPorto
20h 19m
2 stops
PWM9:19 pmPortland
$603

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 fevereiro 22, 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

PortlandPorto

PWM - OPO

PWMOPO

Portland

ter 4/14

5:26 pm-10:15 pm

2 stops23h 49m

Porto

sex 5/8

5:00 am-12:43 am

2 stops24h 43m

$569

PortlandPorto

PWM - OPO

PWMOPO

Portland

ter 4/14

5:26 pm-6:20 pm

2 stops19h 54m

Porto

qua 5/6

11:45 am-12:46 am

2 stops18h 01m

$570

PortlandPorto

PWM - OPO

PWMOPO

Portland

seg 4/13

10:00 am-11:15 am

2 stops20h 15m

Porto

ter 4/28

6:00 am-9:40 pm

2 stops20h 40m

$579

PortlandPorto

PWM - OPO

PWMOPO

Portland

seg 4/13

10:00 am-11:15 am

2 stops20h 15m

Porto

ter 5/5

6:00 am-2:49 pm

2 stops37h 49m

$584

PortlandPorto

PWM - OPO

PWMOPO

Portland

seg 4/13

7:12 pm-9:45 am

1 stop9h 33m

Porto

qui 4/30

6:00 am-7:04 pm

2 stops18h 04m

$603

PortlandPorto

PWM - OPO

PWMOPO

Portland

seg 4/13

7:12 pm-9:45 am

1 stop9h 33m

Porto

ter 5/5

6:00 am-2:49 pm

2 stops37h 49m

$609

PortlandPorto

PWM - OPO

PWMOPO

Portland

ter 4/14

5:26 pm-6:20 pm

2 stops19h 54m

Porto

sáb 5/9

5:00 am-12:43 am

2 stops24h 43m

$619

PortlandPorto

PWM - OPO

PWMOPO

Portland

ter 4/7

7:12 pm-9:45 am

1 stop9h 33m

Porto

ter 4/14

12:05 pm-9:40 pm

2 stops38h 35m

$624

PortlandPorto

PWM - OPO

PWMOPO

Portland

seg 4/13

6:04 am-11:15 am

2 stops24h 11m

Porto

dom 4/26

6:00 am-9:40 pm

2 stops20h 40m

$629

PortlandPorto

PWM - OPO

PWMOPO

Portland

ter 4/14

5:26 pm-6:20 pm

2 stops19h 54m

Porto

qui 4/30

5:00 am-11:24 pm

2 stops23h 24m

$634

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 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 day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Tuesday when prices can be found for as low as $652. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $843. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

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

14h 20m

Direct flights

None
The fastest flight from Portland, Maine to Porto takes 14h 20m
There are no direct flights from Portland, Maine to Porto. There are no popular flight routes from Portland, Maine to Porto.
Search flight deals

  • How far is Portland to Porto by plane?

    Porto is 3072.7 mi away from Portland. Typically, this will take 14h 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
Matosinhos
Braga
Aveiro
Esposende
Lamego
Guimarães
Pinhao
Chaves
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
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.

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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1 adult
ter 3/24
ter 3/31
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