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Cheap flights from Portland, Maine to Porto from $443

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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Find the cheapest flights from Portland, Maine to Porto

Cheap round-trip flights

Delta Logo
1:27 pm - 3:25 pmPWM-OPO
20h 58m2 stops
Delta Logo
11:25 am - 11:54 pmOPO-PWM
17h 29m2 stops
$659Delta
Find Deal
Wed, Nov 5 - Mon, Nov 24
United Airlines Logo
4:51 pm - 3:15 pmPWM-OPO
41h 24m2 stops
United Airlines Logo
6:00 am - 9:50 pmOPO-PWM
44h 50m2 stops
$692United Airlines
Find Deal
Sat, Nov 8 - Sat, Nov 15
United Airlines Logo
2:20 pm - 9:30 amPWM-OPO
14h 10m2 stops
United Airlines Logo
12:35 pm - 11:59 pmOPO-PWM
16h 24m2 stops
$960United Airlines
Find Deal
Sun, Nov 9 - Sun, Nov 16
Multiple Airlines Logo
6:00 am - 9:30 amPWM-OPO
22h 30m1 stop
Multiple Airlines Logo
6:55 am - 5:48 pmOPO-PWM
15h 53m2 stops
$1,157Multiple Airlines
Find Deal
Wed, Nov 5 - Mon, Nov 24
Air Canada Logo
10:45 am - 1:05 pmPWM-OPO
21h 20m3 stops
Air Canada Logo
8:30 am - 11:17 pmOPO-PWM
19h 47m3 stops
$1,217Air Canada
Find Deal
Wed, Nov 5 - Mon, Nov 24
Multiple Airlines Logo
12:38 pm - 11:45 amPWM-OPO
18h 07m2 stops
Multiple Airlines Logo
8:20 am - 9:47 pmOPO-PWM
18h 27m3 stops
$1,318Multiple Airlines
Find Deal
Sat, Nov 8 - Sat, Nov 15
Multiple Airlines Logo
6:00 am - 1:10 pmPWM-OPO
26h 10m1 stop
Multiple Airlines Logo
8:55 am - 11:17 pmOPO-PWM
19h 22m2 stops
$1,779Multiple Airlines
Find Deal
Sat, Nov 8 - Sat, Nov 15
Air Canada Logo
6:00 am - 11:40 amPWM-OPO
24h 40m3 stops
Air Canada Logo
8:55 am - 11:17 pmOPO-PWM
19h 22m3 stops
$2,419Air Canada
Find Deal
Sat, Nov 8 - Sat, Nov 15

United Airlines flights from Portland, Maine to Porto

Our best United Airlines deals on Portland, Maine to Porto flight tickets
United Airlines
Nov 8
PWM4:51 pmPortland
41h 24m
2 stops
OPO3:15 pmPorto
Nov 15
OPO6:00 amPorto
44h 50m
2 stops
PWM9:50 pmPortland
$692
Find similar
United Airlines
Nov 9
PWM2:20 pmPortland
14h 10m
2 stops
OPO9:30 amPorto
Nov 16
OPO12:35 pmPorto
16h 24m
2 stops
PWM11:59 pmPortland
$960
Find similar

Air Canada flights from Portland, Maine to Porto

Our best Air Canada deals on Portland, Maine to Porto flight tickets
Air Canada
Nov 5
PWM10:45 amPortland
21h 20m
3 stops
OPO1:05 pmPorto
Nov 24
OPO8:30 amPorto
19h 47m
3 stops
PWM11:17 pmPortland
$1,217
Find similar
Air Canada
Nov 8
PWM6:00 amPortland
24h 40m
3 stops
OPO11:40 amPorto
Nov 15
OPO8:55 amPorto
19h 22m
3 stops
PWM11:17 pmPortland
$2,419
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 September 25, 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

Wed 11/5

1:27 pm-3:25 pm

2 stops20h 58m

Porto

Mon 11/24

11:25 am-11:54 pm

2 stops17h 29m

$659

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sat 11/8

4:51 pm-3:15 pm

2 stops41h 24m

Porto

Sat 11/15

6:00 am-9:50 pm

2 stops44h 50m

$692

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 11/9

2:20 pm-9:30 am

2 stops14h 10m

Porto

Sun 11/16

12:35 pm-11:59 pm

2 stops16h 24m

$960

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 11/5

6:00 am-9:30 am

1 stop22h 30m

Porto

Mon 11/24

6:55 am-5:48 pm

2 stops15h 53m

$1,157

PortlandPorto

PWM - OPO

PWMOPO

Portland

Wed 11/5

10:45 am-1:05 pm

3 stops21h 20m

Porto

Mon 11/24

8:30 am-11:17 pm

3 stops19h 47m

$1,217

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sat 11/8

12:38 pm-11:45 am

2 stops18h 07m

Porto

Sat 11/15

8:20 am-9:47 pm

3 stops18h 27m

$1,318

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sat 11/8

6:00 am-1:10 pm

1 stop26h 10m

Porto

Sat 11/15

8:55 am-11:17 pm

2 stops19h 22m

$1,779

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sat 11/8

6:00 am-11:40 am

3 stops24h 40m

Porto

Sat 11/15

8:55 am-11:17 pm

3 stops19h 22m

$2,419

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 3/1

2:10 pm-9:30 am

2 stops14h 20m

$443

PortlandPorto

PWM - OPO

PWMOPO

Portland

Sun 3/1

6:00 am-11:40 am

3 stops24h 40m

$532

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 day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Friday when prices can be found for as low as $691. 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 $839. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

At noon is the cheapest time of day to fly from Portland, Maine to Porto when you can find flight prices for as low as $724. Flying to Porto at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $774 on average. Flights to Porto from Portland, Maine in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 14h 10m 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
Aveiro
Coimbra
Braga
Matosinhos
Caminha
Esposende
Lamego
Guimarães
Chaves
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Pinhao
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
Mira

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

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