$399 Cheap Flights from Baltimore (BWI) to Porto (OPO)

View $399 flight on Wed, Feb 25, 2026Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to Porto Airport (OPO)

Cheap Flights from Baltimore to Porto (BWI-OPO)

Prices were available within the past 7 days and start at $399 for one-way flights and $488 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Nov 19 - Tue, Dec 16
BWI
Baltimore
OPO
Porto
$488 Roundtrip, found 1 day ago
$488
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 19 from Baltimore to Porto, returning Tue, Dec 16, priced at $488 found 1 day ago
United
Mon, Mar 2 - Mon, Mar 9
BWI
Baltimore
OPO
Porto
$492 Roundtrip, found 6 days ago
$492
Roundtrip
found 6 days ago
Select United flight, departing Mon, Mar 2 from Baltimore to Porto, returning Mon, Mar 9, priced at $492 found 6 days ago
United
Wed, Nov 19 - Tue, Dec 16
BWI
Baltimore
OPO
Porto
$503 Roundtrip, found 1 day ago
$503
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 19 from Baltimore to Porto, returning Tue, Dec 16, priced at $503 found 1 day ago
Iberia
Wed, Jan 14 - Tue, Jan 20
BWI
Baltimore
OPO
Porto
$506 Roundtrip, found 1 day ago
$506
Roundtrip
found 1 day ago
Select Iberia flight, departing Wed, Jan 14 from Baltimore to Porto, returning Tue, Jan 20, priced at $506 found 1 day ago
United
Tue, Jan 27 - Mon, Feb 2
BWI
Baltimore
OPO
Porto
$509 Roundtrip, found 9 hours ago
$509
Roundtrip
found 9 hours ago
Select United flight, departing Tue, Jan 27 from Baltimore to Porto, returning Mon, Feb 2, priced at $509 found 9 hours ago
Delta
Tue, Jan 27 - Mon, Feb 2
BWI
Baltimore
OPO
Porto
$510 Roundtrip, found 9 hours ago
$510
Roundtrip
found 9 hours ago
Select Delta flight, departing Tue, Jan 27 from Baltimore to Porto, returning Mon, Feb 2, priced at $510 found 9 hours ago
United
Tue, Jan 27 - Mon, Feb 2
BWI
Baltimore
OPO
Porto
$512 Roundtrip, found 9 hours ago
$512
Roundtrip
found 9 hours ago
Select United flight, departing Tue, Jan 27 from Baltimore to Porto, returning Mon, Feb 2, priced at $512 found 9 hours ago
United
Tue, Jan 27 - Mon, Feb 2
BWI
Baltimore
OPO
Porto
$513 Roundtrip, found 9 hours ago
$513
Roundtrip
found 9 hours ago
Select United flight, departing Tue, Jan 27 from Baltimore to Porto, returning Mon, Feb 2, priced at $513 found 9 hours ago
American Airlines
Tue, Jan 27 - Mon, Feb 2
BWI
Baltimore
OPO
Porto
$514 Roundtrip, found 9 hours ago
$514
Roundtrip
found 9 hours ago
Select American Airlines flight, departing Tue, Jan 27 from Baltimore to Porto, returning Mon, Feb 2, priced at $514 found 9 hours ago
KLM
Tue, Jan 27 - Mon, Feb 2
BWI
Baltimore
OPO
Porto
$544 Roundtrip, found 9 hours ago
$544
Roundtrip
found 9 hours ago
Select KLM flight, departing Tue, Jan 27 from Baltimore to Porto, returning Mon, Feb 2, priced at $544 found 9 hours ago

Alternative airports near Porto

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Dr. Francisco de Sa Carneiro OPO. Cheapest and Closest option available. Average driving time to city center is 14 minutes. Flights from $908
OPO
Dr. Francisco de Sa Carneiro
CheapestClosest
Average driving time to city center14 min
Flights from $908

Frequently asked questions

How much does a flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO) cost?
Snag a cheap one-way flight from $399 or cheap return flight from $488 from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO)?
November is the most affordable month to fly from BWI to OPO. Traveling during quieter months is often the key to scoring lower fares.
What is the cheapest airline that flies from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest BWI to OPO flight.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO)?
You'll have to take a flight with a layover if you're traveling from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from BWI to OPO?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO)?
To avoid potential delays on the Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO) route, aim to fly before 3 PM. Later flights are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO) last-minute?
Booking your ticket from BWI to OPO just before your journey is usually more expensive. But if you're flexible with your departure times and dates, you could snag a cheap last-minute fare.
Is it cheaper to book a BWI to OPO flight and hotel package?
Compared with arranging hotels and flights separately, booking a BWI to OPO flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one place takes the hassle out of planning your trip. Just pick your flights and select from our extensive range of stays, then customize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Dr. Francisco de Sa Carneiro Airport (OPO)?
Typically, you can reschedule or cancel your BWI to OPO flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and rules on flight changes, or if you want further information, head to our Customer Service portal.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Dr. Francisco de Sa Carneiro
Airlines serving
Air France, American Airlines, British Airways, Delta, Iberia, KLM, United
Roundtrip price
$488
Distance
3495 mi

Book with confidence

Baltimore to Porto Flights

The cheapest times to fly from Baltimore to Porto

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Baltimore to Porto are during the month of November. You can find some of the cheapest flights from Baltimore to Porto with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Baltimore to Porto

Sunday is one of the best days to book for cheap flights from Baltimore to Porto: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Baltimore to Porto

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Baltimore to Porto in 2025. You can also book with separate airlines for your outbound and return journeys, from $399 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Baltimore to Porto flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Baltimore to Porto airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Baltimore to Porto Flights

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*Available to One Key members.