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$351+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — BWI
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheap flight deals from Porto to Maryland

Keep the following information in mind while searching for Porto to Maryland flight deals. Data was last updated July 3, 2025.

Round-trip from

$500
(oojo)

One-way from

$351
(Kiwi.com)

Popular in

June

Cheapest in

May

Average price

$822
From Porto to Maryland
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One-way flight from Porto to Maryland
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Highest demand for flights based on searches. 11% potential increase in price ($89 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find 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 July 3, 2025.

This oojo deal was found by Cheapflights users on 7/1. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:00 amOPO - IAD
1 stop16h 50mTAP AIR PORTUGAL
Sat 10/1110:35 pmIAD - OPO
1 stop15h 25mTAP AIR PORTUGAL
Deal found 7/1$500
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Fri 10/36:00 amOPO - IAD
1 stop14h 50mUnited Airlines
Sat 10/115:12 pmIAD - OPO
1 stop11h 33mUnited Airlines
Deal found 7/1$567
This Lufthansa deal was found by Cheapflights users on 7/1. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:00 amOPO - IAD
1 stop14h 50mLufthansa
Mon 10/1310:20 pmIAD - OPO
1 stop20h 00mLufthansa
Deal found 7/1$571
This American Airlines deal was found by Cheapflights users on 7/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/88:15 amOPO - IAD
1 stop11h 45mAmerican Airlines
Tue 10/2110:25 amIAD - OPO
2 stops16h 10mAmerican Airlines
Deal found 7/3$572
This United Airlines deal was found by Cheapflights users on 7/1. 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 10/16:00 amOPO - DCA
2 stops21h 43mUnited Airlines
Thu 10/95:15 pmDCA - OPO
1 stop11h 30mUnited Airlines
Deal found 7/1$573
This American Airlines deal was found by Cheapflights users on 7/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/18:15 amOPO - DCA
2 stops19h 02mAmerican Airlines
Sat 10/111:18 pmDCA - OPO
2 stops13h 17mAmerican Airlines
Deal found 7/1$581
This SWISS deal was found by Cheapflights users on 7/1. 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.
Mon 9/297:20 pmOPO - IAD
1 stop25h 55mSWISS
Sun 10/128:45 pmIAD - OPO
1 stop30h 10mSWISS
Deal found 7/1$589
This Air Canada deal was found by Cheapflights users on 7/2. 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.
Wed 10/16:00 amOPO - IAD
2 stops20h 05mAir Canada
Sat 10/111:00 pmIAD - OPO
2 stops17h 30mAir Canada
Deal found 7/2$592
This Iberia deal was found by Cheapflights users on 7/1. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/284:35 pmOPO - IAD
1 stop27h 25mIberia
Mon 10/1310:45 pmIAD - OPO
2 stops27h 50mIberia
Deal found 7/1$599
This Gotogate deal was found by Cheapflights users on 7/3. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/257:20 pmOPO - IAD
1 stop25h 55mMultiple Airlines
Sun 9/76:10 pmIAD - OPO
1 stop23h 40mMultiple Airlines
Deal found 7/3$603
This Delta deal was found by Cheapflights users on 7/1. 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 10/211:35 amOPO - DCA
2 stops17h 06mDelta
Sun 10/125:00 pmDCA - OPO
2 stops17h 30mDelta
Deal found 7/1$606
This Delta deal was found by Cheapflights users on 7/1. 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.
Tue 9/306:15 amOPO - IAD
2 stops18h 22mDelta
Fri 10/109:20 pmIAD - OPO
1 stop13h 10mDelta
Deal found 7/1$606

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 July 3, 2025.
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

Wed 10/1

9:00 am-8:50 pm

1 stop16h 50m

Washington, D.C. Dulles Intl

Sat 10/11

10:35 pm-7:00 pm

1 stop15h 25m

$500

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 10/3

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Sat 10/11

5:12 pm-9:45 am

1 stop11h 33m

$567

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 10/3

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Mon 10/13

10:20 pm-11:20 pm

1 stop20h 00m

$571

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

8:15 am-3:00 pm

1 stop11h 45m

Washington, D.C. Dulles Intl

Tue 10/21

10:25 am-7:35 am

2 stops16h 10m

$572

PortoWashington, D.C.

OPO - DCA

OPODCA

Porto

Wed 10/1

6:00 am-10:43 pm

2 stops21h 43m

Washington, D.C. Reagan-National

Thu 10/9

5:15 pm-9:45 am

1 stop11h 30m

$573

PortoWashington, D.C.

OPO - DCA

OPODCA

Porto

Wed 10/1

8:15 am-10:17 pm

2 stops19h 02m

Washington, D.C. Reagan-National

Sat 10/11

1:18 pm-7:35 am

2 stops13h 17m

$581

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 9/29

7:20 pm-4:15 pm

1 stop25h 55m

Washington, D.C. Dulles Intl

Mon 10/13

8:45 pm-11:30 am

1 stop33h 45m

$589

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/1

6:00 am-9:05 pm

2 stops20h 05m

Washington, D.C. Dulles Intl

Sat 10/11

1:00 pm-11:30 am

2 stops17h 30m

$592

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 9/28

4:35 pm-3:00 pm

1 stop27h 25m

Washington, D.C. Dulles Intl

Mon 10/13

10:45 pm-7:35 am

2 stops27h 50m

$599

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 8/25

7:20 pm-4:15 pm

1 stop25h 55m

Washington, D.C. Dulles Intl

Sun 9/7

6:10 pm-10:50 pm

1 stop23h 40m

$603

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

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.

Reviews of airlines servicing Maryland

Get insights into the airlines that provide service to Maryland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Maryland. Reviews last updated July 3, 2025.
Peruse reviews from past customers who have flown with Delta, KLM, and Austrian Airlines from Porto to Maryland to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,970 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,366 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
809 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,473 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,654 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • What are the cheapest airlines to fly from Porto to Maryland one-way?

    $456 is the cheapest one-way deal found within the past few days, from PLAY. You may also be able to find cheap deals on Royal Air Maroc and American Airlines, with prices starting from $511 and $550, respectively.

  • 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 - Baltimore/Washington and Porto - Washington, D.C. Reagan-National.

  • 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.

  • What is the cheapest month to book a flight from Porto to Maryland?

    Currently, August is the cheapest month in which you can book a flight from Porto to Maryland (average of $241). Flying from Porto to Maryland in March is currently the most expensive (average of $290). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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