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$362+ Cheap flights from Porto (OPO) to Maryland

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — BWI
Mar 3 — Mar 101
Tue 3/3
Tue 3/10
1 adult, Economy
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Cheap flight deals from Porto to Maryland

Cheapest flights from Porto to Maryland
Explore the most affordable flight options available from Porto to Maryland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 1, 2026.

This Mytrip deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
OPO
-
IAD
1 stop14h 50m
Multiple Airlines
Sun 5/248:20 pm
IAD
-
OPO
1 stop34h 05m
Multiple Airlines
Deal found 1/31$454
This Mytrip deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
OPO
-
IAD
1 stop14h 50m
Multiple Airlines
Mon 5/258:20 pm
IAD
-
OPO
1 stop30h 35m
Multiple Airlines
Deal found 1/31$455
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:00 am
OPO
-
IAD
1 stop14h 50m
United Airlines
Wed 3/48:36 am
IAD
-
OPO
1 stop19h 54m
United Airlines
Deal found 1/31$459
This Mytrip deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:00 am
OPO
-
DCA
2 stops18h 59m
Multiple Airlines
Wed 3/46:00 am
DCA
-
OPO
2 stops24h 15m
Multiple Airlines
Deal found 1/31$462
This United Airlines deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:00 am
OPO
-
IAD
1 stop18h 55m
United Airlines
Sun 4/195:55 pm
IAD
-
OPO
1 stop12h 15m
United Airlines
Deal found 1/30$464
This SWISS deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/98:40 am
OPO
-
IAD
1 stop13h 05m
SWISS
Sun 5/178:20 pm
IAD
-
OPO
1 stop17h 10m
SWISS
Deal found 1/31$468
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 am
OPO
-
BWI
2 stops19h 42m
United Airlines
Mon 4/136:00 am
BWI
-
OPO
2 stops24h 10m
United Airlines
Deal found 1/31$470
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 am
OPO
-
DCA
2 stops21h 59m
United Airlines
Mon 4/1311:55 am
DCA
-
OPO
2 stops18h 15m
United Airlines
Deal found 1/31$470
This Air Canada deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:00 am
OPO
-
DCA
2 stops18h 59m
Air Canada
Wed 3/411:05 am
DCA
-
OPO
2 stops19h 10m
Air Canada
Deal found 1/31$471
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:00 am
OPO
-
BWI
2 stops19h 09m
Delta
Wed 3/411:45 am
BWI
-
OPO
2 stops17h 45m
Delta
Deal found 1/31$472
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:00 am
OPO
-
IAD
2 stops20h 45m
Delta
Wed 3/412:24 pm
IAD
-
OPO
2 stops17h 06m
Delta
Deal found 1/31$472
This United Airlines deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:35 pm
OPO
-
DCA
1 stop11h 56m
United Airlines
Sun 4/194:30 pm
DCA
-
OPO
1 stop12h 15m
United Airlines
Deal found 1/30$489

Find flight deals from Porto to Maryland

Keep the following information in mind while searching for Porto to Maryland flight deals. Data was last updated February 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$454
(Mytrip)

One-way from

$368
(FlightHub)

Popular in

August

Cheapest in

June
Provider with most accurate pricing for Porto-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Porto-Washington, D.C. (WAS) flights.
Search Deals
From Porto to Maryland
Search Deals
One-way flight from Porto to Maryland
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($11 potential savings vs. average RT price).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Porto to Maryland 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, Cheapflights users made 2,558,603 searches. Data last updated February 1, 2026.
Use the filters below to find and compare flights from Porto to Maryland that are best for you.

Fly from

Porto

Fly to

Maryland

Route

Depart

Return

Price

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 3/6

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Sun 5/24

8:20 pm-11:25 am

1 stop34h 05m

$454

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 3/6

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Mon 5/25

8:20 pm-7:55 am

1 stop30h 35m

$455

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 2/19

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Wed 3/4

8:36 am-9:30 am

1 stop19h 54m

$459

PortoWashington, D.C.

OPO - DCA

OPODCA

Porto

Thu 2/19

6:00 am-7:59 pm

2 stops18h 59m

Washington, D.C. Reagan-National

Wed 3/4

6:00 am-11:15 am

2 stops24h 15m

$462

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 4/16

6:00 am-7:55 pm

1 stop18h 55m

Washington, D.C. Dulles Intl

Sun 4/19

5:55 pm-11:10 am

1 stop12h 15m

$464

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 3/25

5:00 am-5:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

Mon 4/13

9:45 pm-10:00 pm

1 stop19h 15m

$465

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 5/9

8:40 am-4:45 pm

1 stop13h 05m

Washington, D.C. Dulles Intl

Sun 5/17

8:20 pm-6:30 pm

1 stop17h 10m

$468

PortoBaltimore

OPO - BWI

OPOBWI

Porto

Wed 3/25

6:00 am-9:42 pm

2 stops19h 42m

Baltimore/Washington

Mon 4/13

6:00 am-11:10 am

2 stops24h 10m

$470

PortoWashington, D.C.

OPO - DCA

OPODCA

Porto

Wed 3/25

6:00 am-11:59 pm

2 stops21h 59m

Washington, D.C. Reagan-National

Mon 4/13

11:55 am-11:10 am

2 stops18h 15m

$470

PortoWashington, D.C.

OPO - DCA

OPODCA

Porto

Wed 4/15

6:00 am-7:53 pm

2 stops18h 53m

Washington, D.C. Reagan-National

Sun 4/19

6:00 am-6:30 pm

2 stops31h 30m

$471

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/1

Showing 1-10 of 60 results
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Best time to book a flight from Porto to Maryland

Have a flexible travel schedule? Discover the best time to fly to Maryland from Porto with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Porto to Maryland
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Porto to Maryland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Porto to Maryland?

    Located just 6.8 mi from the city center, Porto (OPO) is the airport most travelers will use when flying to Maryland from Porto.

  • How long is the flight from Porto to Maryland?

    Airlines like United Airlines, Air Canada, and Delta fly from Porto to Maryland in about 14h 50m. The time it takes to get you to your destination can typically vary by up to 4h 19m. Porto and Maryland are separated by a distance of 3537 mi. This flight may include one or multiple stops.

  • What are the most popular routes from Porto to Maryland?

    The most popular flight routes from Porto to Maryland are Porto - Washington, D.C. Dulles Intl, Porto - Washington, D.C. Reagan-National and Porto - Baltimore/Washington.

  • Can I find deals for flights from Porto to Maryland that include hotel bookings?

    Yes. In addition to deals on Porto to Maryland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Porto to Maryland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Porto to Maryland.

  • Can I find deals for business class flights from Porto to Maryland?

    Yes. Cheapflights offers flight deals from Porto to Maryland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for Porto to Maryland

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