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$221+ 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — OPO
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$404
(Flightnetwork)

One-way from

$221
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$805

Good round-trip deal

$565 or less

Good one-way deal

$241 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. 21% potential increase in price ($211 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 16, 2025.

This Flightnetwork deal was found by Cheapflights users on 9/15. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2710:45 pmMIA - OPO
1 stop28h 05mAir Europa
Wed 11/127:35 amOPO - MIA
1 stop16h 55mAir Europa
Deal found 9/15$404
This Flighttix deal was found by Cheapflights users on 9/15. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/274:50 pmMIA - OPO
2 stops36h 40mUnited Airlines
Wed 11/1212:35 pmOPO - MIA
1 stop15h 29mUnited Airlines
Deal found 9/15$415
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Fri 11/711:56 amBOS - OPO
2 stops14h 44mAmerican Airlines
Fri 11/148:20 amOPO - BOS
1 stop11h 55mAmerican Airlines
Deal found 9/16$416
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Wed 10/225:05 pmBOS - OPO
1 stop13h 20mMultiple Airlines
Sun 11/96:15 amOPO - BOS
1 stop17h 20mMultiple Airlines
Deal found 9/15$417
This United deal was found by Cheapflights users on 9/16. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/61:30 pmBOS - OPO
1 stop15h 00mMultiple Airlines
Tue 11/1112:05 pmOPO - BOS
1 stop13h 15mMultiple Airlines
Deal found 9/16$418
This United Airlines deal was found by Cheapflights users on 9/15. 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 11/54:20 pmBOS - OPO
1 stop18h 05mUnited Airlines
Fri 11/1412:35 pmOPO - BOS
2 stops27h 03mUnited Airlines
Deal found 9/15$420
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Wed 10/298:50 pmMIA - OPO
1 stop17h 45mSWISS
Thu 11/1312:05 pmOPO - MIA
1 stop31h 35mSWISS
Deal found 9/16$420
This Mytrip deal was found by Cheapflights users on 9/16. 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 11/1310:15 amBOS - OPO
2 stops19h 55mMultiple Airlines
Tue 12/212:05 pmOPO - BOS
1 stop13h 15mMultiple Airlines
Deal found 9/16$421
This KAYAK deal was found by Cheapflights users on 9/15. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/59:50 pmBOS - OPO
1 stop15h 45mSWISS
Tue 11/189:10 amOPO - BOS
2 stops16h 10mSWISS
Deal found 9/15$422
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/3012:03 pmBOS - OPO
2 stops15h 37mAmerican Airlines
Tue 11/48:20 amOPO - BOS
1 stop11h 55mAmerican Airlines
Deal found 9/15$424
This SWISS deal was found by Cheapflights users on 9/15. 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 11/39:50 pmBOS - OPO
1 stop32h 25mSWISS
Sun 11/96:35 pmOPO - BOS
2 stops54h 45mSWISS
Deal found 9/15$425
This United deal was found by Cheapflights users on 9/14. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/259:13 pmBOS - OPO
1 stop32h 17mMultiple Airlines
Sun 11/96:15 amOPO - BOS
1 stop17h 20mMultiple Airlines
Deal found 9/14$427

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 September 16, 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

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Thu 11/6

1:30 pm-9:30 am

1 stop15h 00m

Porto

Tue 11/11

12:05 pm-8:20 pm

1 stop13h 15m

$418

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 3/11

8:00 pm-9:30 am

1 stop9h 30m

Porto

Fri 4/10

12:35 pm-8:13 pm

1 stop12h 38m

$420

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Sun 3/8

8:00 pm-9:30 am

1 stop9h 30m

Porto

Thu 4/9

12:35 pm-8:13 pm

1 stop12h 38m

$420

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Tue 3/10

6:30 pm-9:30 am

1 stop11h 00m

Porto

Fri 4/10

12:35 pm-8:13 pm

1 stop12h 38m

$420

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Wed 3/11

8:00 pm-9:30 am

1 stop9h 30m

Porto

Thu 4/9

12:35 pm-8:13 pm

1 stop12h 38m

$420

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Sun 11/9

6:25 pm-9:30 am

1 stop10h 05m

Porto

Sun 11/16

6:15 am-6:35 pm

1 stop17h 20m

$422

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Thu 11/13

10:40 am-9:30 am

2 stops17h 50m

Porto

Tue 12/2

12:05 pm-8:20 pm

1 stop13h 15m

$423

BostonPorto

BOS - OPO

BOSOPO

Boston Logan Intl

Tue 3/10

10:44 am-9:30 am

2 stops18h 46m

Porto

Wed 4/8

12:35 pm-6:13 pm

1 stop10h 38m

$424

MiamiPorto

MIA - OPO

MIAOPO

Miami

Tue 11/4

4:42 pm-9:30 am

1 stop11h 48m

Porto

Wed 11/12

12:35 pm-11:04 pm

1 stop15h 29m

$435

New YorkPorto

LGA - OPO

LGAOPO

New York LaGuardia

Mon 11/3

5:35 pm-9:15 pm

2 stops22h 40m

Porto

Wed 11/12

6:05 am-7:03 pm

2 stops17h 58m

$443

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

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
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
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
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
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
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

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 $1,027). 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 September 16, 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.

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 September 16, 2025.
Read through reviews of airlines operating flights from the United States to Porto, such as Delta, Azores Airlines, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

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
7,957 reviews
Delta
8.0
Very good
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

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!
Azores Airlines
7.5
Good
73 reviews
Delta
8.0
Very good
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

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!
United Airlines
7.4
Good
8,924 reviews
Delta
8.0
Very good
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

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!
TAP AIR PORTUGAL
7.1
Good
1,975 reviews
Delta
8.0
Very good
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

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!
Iberia
7.0
Good
2,924 reviews
Delta
8.0
Very good
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

Boarding

8.2

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 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.

  • How long is the flight from USA to Porto?

    For as low as $420, United Airlines can have you in Porto from USA in 9h 30m. Airlines will cover a distance of 3134 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 ($248), Scandinavian Airlines ($354), and United Airlines ($389).

  • 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 New York LaGuardia - 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 $1,027). 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 Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

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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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$269Average$626FlexibilityNo cancel feeOn-time77%
Azores AirlinesCheapest$299Average$662FlexibilityNo cancel feeOn-time74%
SWISSCheapest$338Average$768FlexibilityNo cancel feeOn-time79%
British AirwaysCheapest$374Average$798FlexibilityNo cancel feeOn-time70%
IberiaCheapest$375Average$831FlexibilityNo cancel feeOn-time77%
Air EuropaCheapest$392Average$701FlexibilityNo cancel feeOn-time83%
KLMCheapest$394Average$830FlexibilityNo cancel feeOn-time75%
LEVELCheapest$402Average$606FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$453Average$986FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$457Average$861FlexibilityNo cancel feeOn-time76%

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