PHL - OPO

$348 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 10/14. 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, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Porto

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Porto, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Porto, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$729
Typical prices: $899-$673
United Airlines
Wed 10/14Wed 10/21
PHL - OPO • 2 stops
Cheapest one-way
$348
Typical prices: $289-$545
Air France
Wed 10/14
PHL - OPO • 2 stops
Top airlines
Cheapest • from $768 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Philadelphia and Porto. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $849 (round-trip)
Shortest trip • 10h 51m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 37% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Porto!
Flight Deals
Booking Insights
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

Wed, Oct 14 - Wed, Oct 21
United Airlines Logo
10:30 am - 7:00 am
PHL
-
OPO
15h 30m
2 stops
United Airlines Logo
12:45 pm - 11:21 pm
OPO
-
PHL
39h 36m
2 stops
$729United Airlines
Wed, Oct 14 - Wed, Oct 21
United Airlines Logo
10:30 am - 7:00 am
PHL
-
OPO
15h 30m
2 stops
United Airlines Logo
6:00 am - 4:05 pm
OPO
-
PHL
15h 05m
1 stop
$731United Airlines
Sat, Sep 19 - Tue, Sep 29
United Airlines Logo
7:55 pm - 9:45 am
PHL
-
OPO
32h 50m
2 stops
United Airlines Logo
6:00 am - 4:05 pm
OPO
-
PHL
15h 05m
1 stop
$768United Airlines
Sun, Oct 25 - Sun, Nov 1
United Airlines Logo
6:10 am - 9:30 am
PHL
-
OPO
23h 20m
2 stops
United Airlines Logo
6:00 am - 2:47 pm
OPO
-
PHL
37h 47m
2 stops
$781United Airlines
Sun, Sep 20 - Mon, Sep 28
Iberia Logo
4:15 pm - 8:00 pm
PHL
-
OPO
22h 45m
1 stop
Iberia Logo
4:40 pm - 5:40 pm
OPO
-
PHL
30h 00m
1 stop
$785Iberia
Sat, Sep 19 - Tue, Sep 29
United Airlines Logo
7:55 pm - 9:45 am
PHL
-
OPO
32h 50m
2 stops
United Airlines Logo
12:15 pm - 5:22 pm
OPO
-
PHL
34h 07m
2 stops
$789United Airlines
Sun, Sep 20 - Mon, Sep 28
Iberia Logo
4:15 pm - 8:00 pm
PHL
-
OPO
22h 45m
1 stop
Iberia Logo
8:40 pm - 3:30 pm
OPO
-
PHL
23h 50m
2 stops
$793Iberia
Wed, Oct 14 - Wed, Oct 21
Iberia Logo
8:30 pm - 11:45 am
PHL
-
OPO
10h 15m
1 stop
Iberia Logo
8:40 pm - 5:50 pm
OPO
-
PHL
26h 10m
1 stop
$796Iberia
Sat, Sep 19 - Mon, Sep 28
United Airlines Logo
6:44 pm - 6:55 am
PHL
-
OPO
31h 11m
2 stops
United Airlines Logo
12:10 pm - 2:15 pm
OPO
-
PHL
55h 05m
2 stops
$804United Airlines
Tue, Aug 4 - Tue, Aug 18
United Airlines Logo
3:25 pm - 7:00 am
PHL
-
OPO
10h 35m
1 stop
United Airlines Logo
12:15 pm - 7:19 pm
OPO
-
PHL
36h 04m
2 stops
$820United Airlines
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?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Philadelphia to Porto departing in October.

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 January, where tickets cost $496 (return) on average. On the other hand, the most expensive months are February and June, where the average cost of round-trip tickets is $978 and $937 respectively.

Good to know

Low seasonJanuary
Cheapest flight$348
Best time to beat the crowds with an average 38% drop in price.
Most popular time to fly with an average 12% 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 $348 for a one-way ticket and $768 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, and oneworld are the airline alliances operating flights between Philadelphia and Porto, with Star Alliance 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 $682 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 $893 and an overall rating of 7.1.

  • 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 4 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 9680 reviews
7.1Entertainment
7.7Boarding
6.6Food
7.3Comfort
8.1Crew
Airline reviews

Some crew were unfriendly or in some cases just straight up rude.

6.0 GoodAnonymous, Apr 2026
SFO - YVR
Read more United Airlines reviews

Some crew were unfriendly or in some cases just straight up rude.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

United Airline crews were very friendly and very attentive. 12 hours flight was gone like in a shorter one.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

Food was surprisingly delicious. Space in the seat is horrible when the seating front is reclined. Movie offerings were terrible. Crew was friendly and helpful.

Flight left early and arrived 30 MINUTES early at the destination. Smooth trip.

Flight was 3 hours delayed. They gave our plan to two other routes. Need to knock that off.

The flight was on time and the landing was very smooth. The crew and flight attendants were all very friendly and professional.

Plane was super cold. No entertainment unless you were with mileage program Getting off the plane was super slow

I appreciate that I finally got the seat I paid extra for this time. Thank you

Half of the TSA checkpoints at PHL are closed. Also, there is no standby for first class passengers. You can only standby for coach. Very dated policy and inconsistent with peers.

It would have been nice if American tried to care.

Delayed initially because they couldn’t print the flight details. Poor instruction on delay. When I got on the plane the flight attendant argued with me about whether my carry on would fit (it did, although she didn’t acknowledge that). No greeting (other than arguing with me) getting on or off the plane.

Beverage service was not good. Also just one service in 5 hr 30 min flight. No ask fir water ir anything beside one time beverage service.

They are always late and seats was also not having working charger

In general, I've had excellent experiences with Iberia flights and will continue to use them. In this last flight there were two things that didn't go right. I didn't get the kosher meal I had pre-requested when I had checked in on-line. Things worked out OK as we ended up eating the fish and vegetarian choices, which were really good. The other issue was that some movies for me and my wife started fine but after 8-12 minutes the content just switched to something else. The flight attendant reset our entertainment systems, but the problem persisted. We ended up choosing other movies/TV shows that did work fine.

Awful. They didn't even show concern that her connecting flight( Dallas to Mardrid) was gone/missing. I don't understand how that is even possible. Rudest answer from one of the crew was that American Airlines sold the tickets to somebody else. My daughter was not in the list.

The flight was canceled on a Thursday last minute. I lost thousands of dollars in hotels and car rental

Excellent lie flat seat for premium economy! Great staff. Bad food . Not so great entertainment. My bag didn’t make it either.

Really like the idea experience on this airline I will use again

Plane delayed due to weather. Plane boarded, then told to unboard due to a maintenance issue.

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

The staff was very nice and helpful. Some of the best crew I have met.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

Flight was delayed by several hours and then cancelled due to weather. But Staff was very helpful getting me on a different flight. United should offer food coupons and tooth brush and paste for stranded passengers

I upgraded to the business class cabin. It was the poorest business class I have ever experienced. No access to any business lounge in Tampa airport. Seats are not comfortable. I had a window seat and had to step/crawl over the next seat. Food was mediocre and service below average for business class. Bathroom location was ridiculous. No place to wait. I cannot believe I paid this kind of money and will never fly Lufthansa Discover again. They really should reimburse me somehow.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Was never allowed on and not refunded the full amount of the ticket plus charged a $300 processing fee.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Everything could have been better. What needed to be wrong with United went wrong

The staff was bit rude when I asked for an extra drink after one beer, asked for one wine glass.

Very good, i got two seats for myself, and was comfortable with the blanket i got

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

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

Information on your arrival and departure airports