$285 Find Cheap Flights from Porto to the United States

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Porto to the United States departing on 3/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

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Cheap Flights from Porto to the United States

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
New York
Newark1 stop$365
Los Angeles
Los Angeles1 stop$596
Las Vegas
Las Vegas2 stops$729
Miami
Miami1 stop$498
San Francisco
San Francisco1 stop$564
Boston
Boston1 stop$449
Washington, D.C.
Baltimore1 stop$482
Denver
Denver2 stops$780
Seattle
Seattle1 stop$775
Fort Lauderdale
Fort Lauderdale2 stops$467
Atlanta
Atlanta1 stop$586
Honolulu
Honolulu2 stops$1,003
Philadelphia
Philadelphia1 stop$679
New York
Newark1 stop$365
Los Angeles
Los Angeles1 stop$596
Las Vegas
Las Vegas2 stops$729
Miami
Miami1 stop$498
San Francisco
San Francisco1 stop$564
Boston
Boston1 stop$449
Washington, D.C.
Baltimore1 stop$482
Denver
Denver2 stops$780
Seattle
Seattle1 stop$775
Fort Lauderdale
Fort Lauderdale2 stops$467
Atlanta
Atlanta1 stop$586
Honolulu
Honolulu2 stops$1,003
Philadelphia
Philadelphia1 stop$679

Book Cheap Porto to the United States Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to the United States that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Porto to the United States

Fri, Nov 7 - Thu, Nov 13
Scandinavian Airlines Logo
5:45 pm - 3:40 pmOPO-EWR
26h 55m1 stop
Scandinavian Airlines Logo
5:30 pm - 4:55 pmEWR-OPO
18h 25m1 stop
$365Scandinavian Airlines
Find Deal
Fri, Nov 7 - Thu, Nov 13
Scandinavian Airlines Logo
5:45 pm - 3:40 pmOPO-EWR
26h 55m1 stop
Scandinavian Airlines Logo
6:30 pm - 4:55 pmEWR-OPO
17h 25m2 stops
$385Scandinavian Airlines
Find Deal
Sun, Oct 19 - Sat, Oct 25
TAP AIR PORTUGAL Logo
5:45 pm - 8:25 pmOPO-BOS
7h 40mnonstop
TAP AIR PORTUGAL Logo
11:00 pm - 9:40 amBOS-OPO
6h 40mnonstop
$454TAP AIR PORTUGAL
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Sun, Feb 1 - Thu, Feb 26
United Airlines Logo
6:00 am - 8:31 pmOPO-FLL
19h 31m2 stops
United Airlines Logo
5:00 pm - 9:30 amFLL-OPO
11h 30m1 stop
$467United Airlines
Find Deal
Sun, Oct 19 - Sat, Oct 25
TAP AIR PORTUGAL Logo
5:45 pm - 8:25 pmOPO-BOS
7h 40mnonstop
TAP AIR PORTUGAL Logo
11:50 pm - 2:00 pmBOS-OPO
10h 10m1 stop
$471TAP AIR PORTUGAL
Find Deal
Thu, Feb 12 - Mon, Feb 23
United Airlines Logo
6:00 am - 2:00 pmOPO-EWR
13h 00m1 stop
United Airlines Logo
9:45 pm - 9:30 amEWR-OPO
6h 45mnonstop
$487United Airlines
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Thu, Sep 25 - Thu, Oct 2
Iberia Logo
8:15 am - 2:50 pmOPO-JFK
11h 35m1 stop
Iberia Logo
11:25 pm - 7:55 pmJFK-OPO
15h 30m2 stops
$502Iberia
Find Deal
Tue, Jan 13 - Tue, Feb 3
Iberia Logo
9:55 pm - 8:00 pmOPO-MIA
27h 05m1 stop
Iberia Logo
6:30 pm - 7:40 amMIA-OPO
32h 10m2 stops
$503Iberia
Find Deal
Tue, Oct 7 - Tue, Oct 14
KLM Logo
4:20 pm - 10:40 pmOPO-JFK
11h 20m1 stop
KLM Logo
10:40 pm - 3:30 pmJFK-OPO
11h 50m1 stop
$506KLM
Find Deal
Wed, Oct 8 - Tue, Oct 21
KLM Logo
4:20 pm - 3:35 pmOPO-IAD
28h 15m1 stop
KLM Logo
6:30 pm - 3:30 pmIAD-OPO
16h 00m1 stop
$544KLM
Find Deal
Booking Insights

KAYAK's insights & trends for Porto to the United States flights

Get data-powered insights and trends into flights from Porto to the United States to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Porto to the United States flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to the United States from Porto found in the last 72 hours was to New York, at $482 round-trip. The most popular route is from Porto (OPO) to Newark Airport (EWR), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $482.

Can I save money by flying with a layover from Porto to the United States?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $743, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Porto to the United States?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Porto to the United States, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Porto to the United States is February, when tickets cost $512 (return) on average. On the other hand, the most expensive months are July and August, when the average cost of round-trip tickets is $777 and $683 respectively.

How far in advance should I book a flight from Porto to the United States?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Porto to the United States, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Porto to the United States, you should book around 3 weeks before departure, which saves you about 13% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$285
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Porto to Miami

FAQs - booking United States flights

  • How does KAYAK find such low prices on flights from Porto to the United States?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Porto to the United States.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to the United States?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Porto to the United States is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Porto to the United States?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Porto to the United States with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to the United States?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Porto to the United States up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to the United States?

    The cheapest time of day to fly to the United States is generally at night, when round-trip flights cost $542 on average. Morning departures are around 7% more expensive than evening flights, on average. The most expensive time of day to fly to the United States is generally in the morning, which is peak travel time and where the average cost of a ticket is $706.

Top tips for finding cheap flights to the United States

  • Looking for a cheap flight? 25% of our users found tickets from Porto to the following destinations at these prices or less: Newark $504 one-way - $542 round-trip

Reviews of the top 5 airlines serving from Porto to the United States

 
Need help choosing which airline to fly with from Porto to the United States? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
KLMOverall score based on 1385 reviews
7.8Boarding
7.2Entertainment
7.7Comfort
7.3Food
8.4Crew
Airline reviews

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

2.0 MediocreAnonymous, Aug 2025CTA - AMS
Read more KLM reviews

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

Klm start boarding while somw air issue in the plan

The service was great. However the lounge only gets passing grade

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

IAD with the archaic people movers is just a place to be avoided.

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

All of the United employees I interacted with were professional and courteous. The aircraft was clean, the food on the flight was good. No complaints here.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

I flew with my dog and had already purchased my dog’s ticket. Even that morning I had called costumer service to insure that my husband and I had seats together since the website was giving me an error when choosing our seats and the representative mentioned our dog. I showed up early to the airport and when I got to the gate and we started boarding I was help back and told that I was supposed to have a yellow tag and that I should have checked in at the counter for them to give me that tag. I was not aware of this, the representative on the phone did not say anything. Nor did I see it anywhere in the checking process online, so if you travel with a pet and are not checking in luggage, just know that you still have to go to the check in counter when arriving at the airport unless you want to be the last one to board and not have room for your carry on in the overhead bins. Other than that, I had a great experience.

Once we got in the air the pilot made up some of the time of the delay. So that was really nice.

My flight was delayed about 1 1/2 hours in Chicago, but other then that it was a good flight.

This is the best united airlines flight that I took. The crew was very friendly and the food was tasty!

Check-in guidance for transfer flight, boarding, in-flight service, seat comfort, etc.

Very rude person at the boarding desk; flight attendant coughing 3 inches from my face three times- not even covering her mouth; boarding process very unacceptable for older people with stairs to all planes (are you all stuck in the 1960’s?). I am sure that I am not remembering all of the negative things, but I am sure you get the message!

Flight was fine. Second meal ( fish sandwich on hard roll) was awful. My suitcase didn’t make the flight. It had been located, but won’t be delivered until tomorrow. Five days after flight

Boarding experience was awful. TAP claims I did not have check in luggage with tickets. I went 3-4 check in agents until I finally found a helpful kind agent who checked in my luggage with no fees. On top of that our flight was over 2 hours delayed with barely an apology or explanation.

The airport temperature at the airport and on the flight was too warm

Flight being delayed for 35 minutes had me lose the connection to my transport

Was the best airplane ✈️ ever that I never see I will traveling again again with u guys.

Flight was delayed on 6/20 to miss international connection. Next flight out was 24 hours later. Not acceptable.

Flight from FNC to OBO was cancelled. We were rebooked to Lisbon later in the day. It was inconvenient but it worked out ok in the end.

Terrible flight attendant attitude. Average 3-star hotel employee has better hospitality skills. Business class seats are literally a joke. TAP executives should ride business class in other airlines to develop some rudimentary sense of what business class is.

Great staff, just very far from the main terminal, had to run to connect my flight. I had 90 minutes to spare. But my flight from Chicago was delayed also.

My luggage is lost and nowhere to be found, no response from airline

Boarding was a shitshow. Had to bus to the gate. No separate bus and boarding process for Business Class.

The plane was very old, no power outlets. We also had to wait a long time to board. They kept moving us to different lines before we actually could step foot on the plane. We ended up being delayed an hour but we were never told or informed for any reason. After the meal I asked for a coffee which the flight attendant forgot and I had to ask again. Overall not the worst but not the best experience.

Need to pay for headsets, water, or any extra except air to breath.

Sitting space was very tight and I am not big or fat (I am 5'10" 178 Lb), so eating was very challenging. The rest was good.

Sitting space was very tight, so eating was difficult. But everything else was good.

12 hours flight. Only one meal, not enough food. At the galley only water during the flight. Lavatories not clean. Headsets at extra cost.

Need to pay for a cup of water. No food. Need to pay for headsets.

Everything should improve! Service like a low cost but prices like a premium airline. Crew in general with bad manners arguing for everything. You pay for priority access but then they use buses, so your loose your advantage to put your carry on first. That was the purpose for paying for priority. Bording is a nightmare, people accessing the plane for bothering doors, front and rear, no matter which line do you have.

temperature was too cold there should be free blankets, seat are very uncomfortable, entertainment is limited.

Basic service for a decent price, all amenities are à la cart

Cabin crew friendlier, they weren't weren't unfriendly, but simply professional and not more

It was extremely cold in the back of the plane. The seats are uncomfortable and space very small. Crew was excellent as usual.

The plane needs upgrading, the seats are uncomfortable, we are a family of three and they split us and did nothing to group us together, and the food is horrible compared to other airlines bu

Horrible almost missed my flight because my 1st flight was delayed. Airline crew is so unprofessional. The people on the plane do whatever they want kids running screaming. Will never fly this airline again Suitcases never arrived

Check in needed to be in person, not nice. Also I won’t do connections in Charlotte again because you need to go through security again and short connections become a problem

It was good but I did not appreciate not being able to check in online

Boarding was odd. Gates switched and had to take a bus to the plane. Luggage got lost. Still waiting on one bag. Flight itself was very nice!

Do Not Fly Iberia. Horrible experience. Iberia changes things at random -like the date of the flight and seat you have bought. After buying my flight, they contacted me and told me I had to return a day later. Then when I was boarding the flight, I discovered they had changed my window seat in a row away from the wing, to an aisle seat in front of the toilet! The worse seat on the plane. But it wasn’t just me- a family was scattered all over the plane. I was able to trade my seat because a father was separated from his son. Unfortunately the seat was the window seat directly over the wing, the loudest seat in the plane. I couldn’t sleep, even with noise cancelling earphones. Also, I ordered gluten free meal-which was tasteless and gave me cramps.

Everything you need to know for your flight from Porto to the United States

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