PHL - OPO

$367 Find Cheap Flights from Philadelphia to Porto

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Porto departing on 2/26. 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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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Porto.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Porto.
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Flight Deals

Cheap Flights from Philadelphia to Porto (PHL-OPO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Porto 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 Philadelphia to Porto

Mon, Oct 27 - Tue, Nov 4
United Airlines Logo
12:40 pm - 9:30 amPHL-OPO
16h 50m2 stops
United Airlines Logo
6:00 am - 4:05 pmOPO-PHL
15h 05m1 stop
$476United Airlines
Find Deal
Sun, Oct 26 - Tue, Nov 4
United Airlines Logo
10:34 am - 9:30 amPHL-OPO
18h 56m2 stops
United Airlines Logo
6:00 am - 4:05 pmOPO-PHL
15h 05m1 stop
$482United Airlines
Find Deal
Sun, Oct 26 - Wed, Nov 5
United Airlines Logo
10:34 am - 9:30 amPHL-OPO
18h 56m2 stops
United Airlines Logo
12:35 pm - 9:46 amOPO-PHL
26h 11m2 stops
$485United Airlines
Find Deal
Wed, Mar 4 - Tue, Mar 10
British Airways Logo
6:35 pm - 4:05 pmPHL-OPO
16h 30m1 stop
British Airways Logo
8:20 am - 7:30 pmOPO-PHL
15h 10m2 stops
$522British Airways
Find Deal
Mon, Oct 27 - Wed, Nov 5
Lufthansa Logo
4:35 pm - 12:50 pmPHL-OPO
16h 15m2 stops
Lufthansa Logo
4:15 pm - 4:05 pmOPO-PHL
28h 50m1 stop
$525Lufthansa
Find Deal
Mon, Mar 2 - Mon, Mar 9
British Airways Logo
6:35 pm - 4:40 pmPHL-OPO
17h 05m1 stop
British Airways Logo
5:30 pm - 5:15 pmOPO-PHL
27h 45m1 stop
$547British Airways
Find Deal
Thu, Mar 5 - Mon, Mar 9
American Airlines Logo
10:30 am - 7:40 amPHL-OPO
16h 10m2 stops
American Airlines Logo
8:40 pm - 4:35 pmOPO-PHL
23h 55m1 stop
$560American Airlines
Find Deal
Wed, Mar 4 - Sun, Mar 8
Lufthansa Logo
4:35 pm - 3:25 pmPHL-OPO
17h 50m2 stops
Lufthansa Logo
6:00 am - 4:05 pmOPO-PHL
15h 05m1 stop
$581Lufthansa
Find Deal
Wed, Oct 29 - Wed, Nov 5
Iberia Logo
7:00 pm - 11:45 amPHL-OPO
36h 45m2 stops
Iberia Logo
8:40 pm - 3:40 pmOPO-PHL
24h 00m1 stop
$584Iberia
Find Deal
Wed, Oct 29 - Wed, Nov 5
Iberia Logo
9:00 pm - 7:40 amPHL-OPO
30h 40m1 stop
Iberia Logo
8:40 pm - 3:40 pmOPO-PHL
24h 00m1 stop
$611Iberia
Find Deal

Everything you should know

Top airlines
United Airlines
Cheapest • from $476 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 42% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
November
Cheapest • 17% price drop
August
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$476
Typical prices: $657-952
United Airlines
Mon 10/27Tue 11/4
PHL - OPO • 2 stops
Cheapest one-way
$367
Multiple Airlines
Thu 2/26
PHL - OPO • 3 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Porto!
Booking Insights

KAYAK's insights & trends for Philadelphia to Porto flights

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

How much is a round-trip flight from Philadelphia to Porto?

What’s the cheapest day of the week to fly from Philadelphia to Porto?

The average price of all round-trip flights from Philadelphia to Porto clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Porto on a Sunday, as we generally find the cheapest rates on that day for this route. On the other hand, Wednesday is the most expensive day to fly from Philadelphia to Porto. For your return ticket, we recommend flying on a Thursday and avoiding Tuesdays for the best deals.

What is the cheapest month to fly from Philadelphia to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to Porto, 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 Philadelphia to Porto is November, where tickets cost $667 (return) on average. On the other hand, the most expensive months are May and June, where the average cost of round-trip tickets is $961 and $946 respectively.

How far in advance should I book a flight from Philadelphia to Porto?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Philadelphia to Porto, 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 Philadelphia to Porto, you should book around 3 weeks before departure, which saves you about 42% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$367
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly with an average 2% increase in price.
Flight from Philadelphia to Porto

When to book flights from Philadelphia to Porto

Are your dates flexible? Find out the best times to travel from Philadelphia to Porto based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Philadelphia to Porto

  • What is the cheapest flight from Philadelphia to Porto?

    In the last 3 days, the lowest price for a flight from Philadelphia to Porto was $367 for a one-way ticket and $476 for a round-trip.

  • Do I need a passport to fly between Philadelphia and Porto?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Philadelphia and on arrival in Porto.

  • Which aircraft models fly most regularly from Philadelphia to Porto?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Philadelphia to Porto?

    Star Alliance, oneworld, and SkyTeam are the airline alliances operating flights between Philadelphia and Porto, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Philadelphia to Porto, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from Philadelphia to Porto are United Airlines and American Airlines. With an average price for the route of $832 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $843 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Philadelphia to Porto?

    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 Philadelphia to Porto.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Philadelphia 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 Philadelphia to Porto?

    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 to Porto with an airline and back to Philadelphia with another airline. Booking your flights between Philadelphia and OPO can sometimes prove cheaper using this method.

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

    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 to Porto from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Philadelphia to Porto

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to Porto. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Porto? 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.
7.4
United AirlinesOverall score based on 8929 reviews
7.3Comfort
6.6Food
7.7Boarding
8.1Crew
7.1Entertainment
Airline reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

2.0 MediocreAnonymous, Sep 2025SFO - MEX
Read more United Airlines reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

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.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Tastless food and too obvious lack of enthusiasm for service in the economy vesus business class

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.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

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. .

Flight was delayed not sure why no explanation given and no apologies either. Otherwise the flight was fine

Did not get the seat I selected and paid for.

The flight was canceled 3 hours after original take off time

Plane was delayed for 6 hours, at first by weather, which is understandable, but was further delayed with NO given reason for 2 1/2 hours more. We had no clue when we were going to depart actually until they opened the ramp. VERY POOR to ZERO COMMUNICATION!!!

Flight was delayed and after being in the airport for like seven hours, it was canceled.

Flight delays numerous times. Everytime we would get close to boarding it would be delayed again. Strung along the entire time.

Overall very good, only complaint I have is the crew from CLT to SAT could have collected trash sooner.

Above and beyond effort from this crew in a tough situation. So helpful and understanding. Thank you!

We started with trouble checking in 24 hours early. Then my husband did not get his TSA precheck. Finally flight delayed due to no crew. I know things happen

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

It was fortunate that the flight arrived in London in accordance with schedule, and the luggage was promptly transferred to the luggage carousel. However, I find it concerning that even minor issues in economy cabins are prevalent within the industry. American Airlines, in particular, appears to have the least legroom and feels more crowded due to the proximity of neighboring passengers. Additionally, the crew’s adherence to protocol is inconsistent. While they may enforce certain rules set by the FAA on a select few individuals, they often overlook numerous violations, such as failing to reset seat recline during landing.

We liked the flight but while we purchased an aisle seat, our seats had a different configuration on this flight. A fellow passenger suggested that the airplane had been changed. Too bad we were not informed and had no chance to modify our seat preferences. We were stuck in the window and middle seats with no chance to walk around and go to the bathroom without disturbing our sleeping fellow passenger.

The crew were not very personable. The crew did not serve tea or coffee. The bathroom was not kept clean. Two out of the 5 toilets in the cabin weren't working.

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

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

Iberia lost my bag, said they found it in another country, said they sent it to me, but never did. Went my whole trip without my stuff, but expecting it to show up because that’s what they said would happen. Their communication sucks, their website sucks, and to top it all off, their seats are small and uncomfortable. They’re bad at their jobs and they should feel bad about themselves. Do not even get me started on the flight home. AVOID!

I described my experience in the previous window. I didn't realize that there would be another opportunity for this flight. Please look at my response in the previous window.

Boarding was 2 1/2 late no explanation Captain said he did not know why, but he rested at home for an extra couple of hours. Food was edible, Nothing more.

I liked the comfort of the plane. It was unexpected from past experiences.

BEWARE!!! Iberia changes your seats at random. I paid for a window seat and they changed it to one in the middle aisle resting against the bathroom- can’t lean back + hear every flush. This on a 11 hour flight.. There were families that were broken up with separate seats all over the plane. Lots of upset passengers showing their seat confirmation to the besieged and helpless airline steward. Also, the gluten free meal was tasteless.

I liked Quiet people around me. Crew could have helped people with overhead luggage so they aren't moving other peoples bags around and causing problems for people that had there bags there first

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

The plane was delayed by two hours in Chicago which led to us missing the next flight. Lufthansa rebooked the flight and booked us a hotel for the night in Frankfurt. The level of customer service and getting us taken care of was superb. The flight crew and the service on the ground was superb.

It was a short flight, everything was good with it.

Flight was delayed over one hour and I had to pay to select my seat, even though my booking supposedly had free selection (I paid extra for this at time of booking)

Stop charging for alcohol overseas flights and start taking cash again not everyone wants to pay with card if the person is bigger give him seat on the outside seats not the middle in between the people is common sense and mainly if you fly for Lufthansa provides the sam service and experience...

good entertainment package but rather small seats for business class

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

Booked Economy but it translated to economy light for Lufthansa so now we are stuck paying an extra $75 per person both ways for our checked bags. If I had known that, I would have never booked these tickets because it came out to be more than other options. The booking in the kayak side clearly says Economy and has a link to the inormation for Lufthansa which states Economy included a checked bag. Super annoyed about that.

The flight from Dulles to Munich was just okay. The seats were comfortable and extra foot room was noticeable in comfort plus. Disappointed in the booking in so much I requested an aisle seat and then was assigned a middle seat. The food was inedible. Movie choices were moderate. I usually fly Delta, but this WA flight was cheaper. Next time, I'll happily pay the extra to fly Delta.

The seating has become ridiculous… like a contest to see how narrow and short they can be made- forcing anyone over 5’1 to pay more to not be twisting oneself into a pretzel. Really insane- would have thought BA was better than this. Frankly- it cancels out a lot of the positive aspects.

flight was delayed from BWI to London - missed my connecting flight & then connecting flight (also British Air) was delayed - food is awful, TV & movie selection is great

Three major things that led to my low rating, 1. Internet wasn't available for the whole time, and 2. TV became available way into flight, after numerous system reboots, and 3. Food is not good at all.

Super tight economy class. My knees were hitting the back of seat in front of me (I'm only 5'6"). My small backpack (sized according to their required dimensions) would not fit under the seat in front of me because there is a box (is that the life jacket?) in the way. Over all, extremely uncomfortable. I forgive the tasteless food, but the tight seating was torture

Didn’t fly with them as someone had cancelled my flight

Some how my flight was canceled, neither BA or Justfly.com accepted responsibility. I only found out about this the day before when I tried to check in. I had to book another flight which due to the time ( day before) cost me $300 more. I was still receiving notifications about the flight even when I was on another flight from you. So no my flight to London was not good.

Online check-in 24 hours in advance something seems not so easy to check in to pick seats and to print a boarding pass

I like the crew, very welcoming. Food can be better. The seat arms don’t go up so. I could use the empty seat next to mine to relax better. 3hrs delay 😠

Boarding was efficient and quick, crew was very attentive, seats were comfortable.

Everything was very good! I personally struggled with the heat in the cabin for the first 2 hours

Everything you need to know for your flight from Philadelphia to Porto

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