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$259+ Cheap flights from the United States to Porto (OPO)

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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — OPO
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from USA to Porto

Keep the following information in mind while searching for USA to Porto flight deals. Data was last updated June 12, 2025.

Round-trip from

$612
(Cheapflightsfares)

One-way from

$259
(Cheapflightsfares)

Popular in

July

Cheapest in

November

Average price

$1,012

Good round-trip deal

$565 or less

Good one-way deal

$445 or less
From USA to Porto
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One-way flight from USA to Porto
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Highest demand for flights based on searches. 23% potential increase in price ($241 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from USA to Porto.
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Price to beat on a one-way flight from USA to Porto.
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Find flight deals from USA to Porto

Cheapest flights from USA to Porto
Explore the most affordable flight options available from USA to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/10. 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 11/1910:56 amBWI - OPO
2 stops19h 44mUnited Airlines
Wed 11/266:00 amOPO - BWI
2 stops32h 59mUnited Airlines
Deal found 6/10$515
This Expedia deal was found by Cheapflights users on 6/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/28:30 pmBWI - OPO
2 stops30h 10mBritish Airways
Fri 11/78:40 pmOPO - BWI
2 stops51h 05mBritish Airways
Deal found 6/12$578
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2511:15 pmBOS - OPO
Nonstop6h 40mTAP AIR PORTUGAL
Mon 9/16:05 pmOPO - BOS
Nonstop7h 40mTAP AIR PORTUGAL
Deal found 6/11$612
This United Airlines deal was found by Cheapflights users on 6/11. 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 8/275:30 amBOS - OPO
2 stops22h 50mUnited Airlines
Thu 9/2512:10 pmOPO - BOS
2 stops36h 21mUnited Airlines
Deal found 6/11$613
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2410:55 pmBOS - OPO
Nonstop6h 40mMultiple Airlines
Mon 9/2210:30 amOPO - BOS
1 stop15h 45mMultiple Airlines
Deal found 6/12$615
This Air Canada deal was found by Cheapflights users on 6/11. 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.
Sat 10/46:55 pmBOS - OPO
2 stops35h 20mAir Canada
Thu 10/168:40 amOPO - BOS
2 stops42h 59mAir Canada
Deal found 6/11$616
This SWISS deal was found by Cheapflights users on 6/10. 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.
Fri 10/3110:55 pmBOS - OPO
2 stops38h 40mSWISS
Wed 11/122:10 pmOPO - BOS
2 stops35h 10mSWISS
Deal found 6/10$622
This Delta deal was found by Cheapflights users on 6/10. 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.
Sat 9/65:30 pmBOS - OPO
2 stops17h 05mDelta
Sat 9/274:20 pmOPO - BOS
2 stops20h 05mDelta
Deal found 6/10$624
This Delta deal was found by Cheapflights users on 6/11. 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 10/145:30 pmBWI - OPO
2 stops17h 00mDelta
Thu 10/2311:35 amOPO - BWI
2 stops17h 37mDelta
Deal found 6/11$625
This Mytrip deal was found by Cheapflights users on 6/9. 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 9/124:15 pmJFK - OPO
2 stops23h 45mMultiple Airlines
Sat 9/279:25 pmOPO - JFK
2 stops20h 55mMultiple Airlines
Deal found 6/9$637
This Brussels Airlines deal was found by Cheapflights users on 6/9. 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 Brussels Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/263:55 pmJFK - OPO
2 stops15h 10mBrussels Airlines
Sun 11/3012:55 pmOPO - JFK
2 stops55h 45mBrussels Airlines
Deal found 6/9$639
This Scandinavian Airlines deal was found by Cheapflights users on 6/10. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/129:36 amJFK - OPO
2 stops20h 24mScandinavian Airlines
Wed 9/311:50 amOPO - JFK
2 stops32h 50mScandinavian Airlines
Deal found 6/10$640

Cheapflights Fare Finder

Customize your flight search to find flights from USA 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, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from the United States to Porto that are best for you.

Fly from

USA

Fly to

Porto

Route

Depart

Return

Price

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Wed 11/19

10:56 am-11:40 am

2 stops19h 44m

Porto

Wed 11/26

6:00 am-9:59 am

2 stops32h 59m

$515

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Sun 11/2

8:30 pm-7:40 am

2 stops30h 10m

Porto

Fri 11/7

8:40 pm-6:45 pm

2 stops51h 05m

$578

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Mon 8/25

11:15 pm-10:55 am

Nonstop6h 40m

Porto

Mon 9/1

6:05 pm-8:45 pm

Nonstop7h 40m

$612

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 8/27

5:30 am-9:20 am

2 stops22h 50m

Porto

Thu 9/25

12:10 pm-7:31 pm

2 stops36h 21m

$613

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Sun 8/24

10:55 pm-10:35 am

Nonstop6h 40m

Porto

Mon 9/22

10:30 am-9:15 pm

1 stop15h 45m

$615

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Sat 9/6

5:30 pm-3:35 pm

2 stops17h 05m

Porto

Sat 9/27

4:20 pm-7:25 am

2 stops20h 05m

$624

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 8/27

3:20 pm-9:20 am

1 stop13h 00m

Porto

Thu 9/11

6:00 am-9:55 am

2 stops32h 55m

$625

BaltimorePorto

BWI - OPO

BWIOPO

Baltimore/Washington

Tue 10/14

5:30 pm-3:30 pm

2 stops17h 00m

Porto

Thu 10/23

11:35 am-12:12 am

2 stops17h 37m

$625

New YorkPorto

JFK - OPO

JFKOPO

New York John F Kennedy Intl

Tue 8/12

9:36 am-11:00 am

2 stops20h 24m

Porto

Wed 9/3

11:50 am-3:40 pm

2 stops32h 50m

$640

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 8/27

8:05 pm-11:20 pm

1 stop22h 15m

Porto

Fri 9/12

6:00 am-8:10 pm

1 stop19h 10m

$640

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 60 results
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The best insider tips for theUnited States to Porto flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your theUnited States to Porto trip
Airlines
TAP AIR PORTUGAL

TAP's A330NEO offers 2-4-2 seating for more space and comfort on long-haul flights.


TAP's business class provides lie-flat seats and a nice wine list on long-haul flights.

Read more about TAP AIR PORTUGALby Gabriel Leigh
United Airlines

United Polaris offers lie-flat seats and Saks Fifth Avenue bedding on long-haul routes.


United Premium Plus includes extra legroom and upgraded meals on international flights.

Read more about United Airlinesby Harriet Baskas
Delta

Delta One offers 180-degree flat-bed seats with duvets and lumbar pillows on long-haul routes.


Delta Comfort Plus provides extra legroom and upgraded snacks, ideal for international flights.

Read more about Deltaby Harriet Baskas
Azores Airlines

Azores Airlines' Comfort Plus includes 2 oversize checked bags and lounge access.


Azores Airlines offers a stopover option in the Azores for up to 7 days.

Read more about Azores Airlinesby Evie Carrick
KLM

KLM's Economy Comfort offers 4 extra inches of legroom, enhancing comfort on long-haul flights.


KLM's Premium Economy provides extra width and legroom in a mini-cabin for added comfort.

Read more about KLMby Gabriel Leigh
Iberia

Iberia's Premium Economy offers 37 inches of legroom and noise-canceling headphones on long-haul flights.


Iberia Business Class features lay-flat beds and adjustable pillows for comfort on long-haul flights.

Read more about Iberiaby Emily Zemler
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on TAP AIR PORTUGAL and KLM

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines and Delta

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Evie Carrick

Evie Carrick

Expert on Azores Airlines

Evie Carrick

Evie Carrick

Evie Carrick is a writer and editor who has lived in five countries and traveled to over 50, with extensive experience flying around the world. She was born in Colorado, but has spent time flying to both coasts to visit family. She writes regularly for Travel + Leisure, BuzzFeed, and SKI and recently published seven travel journals with Simon & Schuster.

Read more
Emily Zemler

Emily Zemler

Expert on Iberia

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more

Best time to book a flight from USA to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from USA 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 the United States to Porto

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

Currently, January is the cheapest month in which you can book a flight from USA to Porto (average of $523). Flying from USA to Porto in June is currently the most expensive (average of $1,047). 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.

What is the cheapest time of day to fly from US to OPO?

Find hourly flight availability from USA to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

When flying from USA to Porto, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Porto by month

Plan your trip to Porto by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

Plan your trip to Porto by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated June 12, 2025.
Get a feel of what it's like to fly with Delta, Porter Airlines and KLM from USA to Porto by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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!
Porter Airlines
8.0
Very good
288 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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
1,358 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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 Transat
7.8
Good
396 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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!
Azores Airlines
7.6
Good
66 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

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 USA to Porto. 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 into for flights to Porto from United States?

    Porto (OPO) is the airport you will fly into if you book a flight from United States to Porto. It is only a 6.8 mi journey from Porto (OPO) to Porto’s city center.

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

    The cheapest airlines for a one-way flight from USA to Porto are TAP AIR PORTUGAL ($259), PLAY ($327), and Iberia ($330).

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

    When deciding which route to take from USA to Porto consider Newark - Porto, New York John F Kennedy Intl - Porto or Boston Logan Intl - Porto as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from USA to Porto 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 USA to Porto?

    Currently, January is the cheapest month in which you can book a flight from USA to Porto (average of $523). Flying from USA to Porto in June is currently the most expensive (average of $1,047). 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

Traveling to a place near the United States?

Book flights to the United States if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos
Arcos de Valdevez

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Alternative routes for USA to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from USA to Porto

Discover the top 10 airlines that operate flights from USA to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$269Average$626FlexibilityNo cancel feeOn-time77%
Azores AirlinesCheapest$293Average$667FlexibilityNo cancel feeOn-time74%
TAP AIR PORTUGALCheapest$375Average$821FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$377Average$776FlexibilityNo cancel feeOn-time79%
IberiaCheapest$419Average$848FlexibilityNo cancel feeOn-time77%
LEVELCheapest$421Average$666FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$425Average$921FlexibilityNo cancel feeOn-time75%
DeltaCheapest$436Average$1,003FlexibilityNo cancel feeOn-timeN/A
Air EuropaCheapest$469Average$721FlexibilityNo cancel feeOn-time83%
American AirlinesCheapest$472Average$922FlexibilityNo cancel feeOn-time71%

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