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$246+ Cheap flights from Philadelphia (PHL) 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — OPO
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
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Find cheap flights from Philadelphia to Porto with Cheapflights

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Cheapflights Tip: The best prices from Philadelphia to Porto are usually found in November or January, booked 31 days in advance, depart on a Sunday or Saturday and return on a Monday

Find flight deals from Philadelphia to Porto

Cheapest flights from Philadelphia to Porto
Explore the most affordable flight options available from Philadelphia to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 23, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 10/22. 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.
Wed 11/123:30 pmPHL - OPO
2 stops16h 45mLufthansa
Thu 11/206:00 amOPO - PHL
1 stop15h 05mLufthansa
Deal found 10/22$475
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Tue 11/1812:22 pmPHL - OPO
2 stops16h 08mUnited Airlines
Tue 11/256:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 10/21$478
This Booking.com deal was found by Cheapflights users on 10/22. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/123:30 pmPHL - OPO
2 stops16h 45mAir Canada
Thu 11/206:00 amOPO - PHL
2 stops21h 46mAir Canada
Deal found 10/22$482
This Air France deal was found by Cheapflights users on 10/21. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/171:25 pmPHL - OPO
2 stops16h 05mMultiple Airlines
Wed 12/36:00 amOPO - PHL
2 stops15h 56mMultiple Airlines
Deal found 10/21$483
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Sun 11/166:00 amPHL - OPO
2 stops22h 30mUnited Airlines
Tue 11/256:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 10/21$484
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Tue 12/25:40 pmPHL - OPO
1 stop13h 00mUnited Airlines
Tue 12/96:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 10/21$489
This United Airlines deal was found by Cheapflights users on 10/22. 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 11/2610:05 amPHL - OPO
2 stops18h 25mUnited Airlines
Tue 12/212:30 pmOPO - PHL
2 stops31h 17mUnited Airlines
Deal found 10/22$498
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Tue 11/255:40 pmPHL - OPO
1 stop13h 00mUnited Airlines
Wed 12/312:30 pmOPO - PHL
1 stop32h 35mUnited Airlines
Deal found 10/21$508
This Delta deal was found by Cheapflights users on 10/21. 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.
Mon 12/810:15 amPHL - OPO
2 stops19h 15mDelta
Wed 12/1711:25 amOPO - PHL
2 stops34h 31mDelta
Deal found 10/21$510
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Thu 11/1312:40 pmPHL - OPO
2 stops15h 50mUnited Airlines
Thu 11/206:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 10/21$528
This British Airways deal was found by Cheapflights users on 10/21. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/36:35 pmPHL - OPO
1 stop16h 30mBritish Airways
Thu 12/114:55 pmOPO - PHL
1 stop28h 20mBritish Airways
Deal found 10/21$532
This Kiwi.com deal was found by Cheapflights users on 10/21. 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.
Thu 11/205:40 pmPHL - OPO
1 stop16h 05mLufthansa
Thu 11/276:00 amOPO - PHL
1 stop15h 05mLufthansa
Deal found 10/21$539

Cheap flight deals from Philadelphia to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$475
(Cheapflightsfares)

One-way from

$246
(Kiwi.com)

Popular in

May

Cheapest in

November

Average price

$740
Provider with most accurate pricing for Philadelphia-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Porto flights.
Search Deals
From Philadelphia to Porto
Search Deals
One-way flight from Philadelphia to Porto
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($54 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia 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 October 23, 2025.
Use the filters below to find and compare flights from Philadelphia to Porto that are best for you.

Fly from

Philadelphia

Fly to

Porto

Route

Depart

Return

Price

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Tue 11/18

12:22 pm-9:30 am

2 stops16h 08m

Porto

Thu 11/27

6:00 am-4:05 pm

1 stop15h 05m

$478

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 11/17

1:25 pm-10:30 am

2 stops16h 05m

Porto

Wed 12/3

6:00 am-4:56 pm

2 stops15h 56m

$483

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Tue 12/2

5:40 pm-11:40 am

1 stop13h 00m

Porto

Tue 12/9

6:00 am-4:05 pm

1 stop15h 05m

$489

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 11/17

10:05 am-9:30 am

2 stops18h 25m

Porto

Wed 12/3

12:30 pm-4:05 pm

1 stop32h 35m

$489

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Wed 11/26

12:40 pm-9:30 am

2 stops15h 50m

Porto

Mon 12/1

12:30 pm-4:05 pm

1 stop32h 35m

$498

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 11/24

12:40 pm-9:30 am

2 stops15h 50m

Porto

Wed 12/3

12:30 pm-4:05 pm

1 stop32h 35m

$498

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 11/17

12:40 pm-9:30 am

2 stops15h 50m

Porto

Wed 11/26

12:30 pm-4:05 pm

1 stop32h 35m

$498

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Thu 11/27

10:05 am-9:30 am

2 stops18h 25m

Porto

Thu 12/4

6:00 am-4:05 pm

1 stop15h 05m

$528

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Thu 11/13

12:40 pm-9:30 am

2 stops15h 50m

Porto

Thu 11/20

6:00 am-4:05 pm

1 stop15h 05m

$528

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Sun 11/23

6:35 pm-4:40 pm

1 stop17h 05m

Porto

Tue 12/2

5:30 pm-4:15 pm

1 stop27h 45m

$532

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/23

Showing 1-10 of 21 results
1
2
3

Compare providers for flights from Philadelphia to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Porto in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Philadelphia-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Philadelphia-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-Porto flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Philadelphia to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Philadelphia 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 Philadelphia to Porto

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

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to Porto. Price data was last updated on October 17, 2025.

Booking 30 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to Porto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, October is the cheapest month in which you can book a flight from Philadelphia to Porto (average of $383). Flying from Philadelphia to Porto in July is currently the most expensive (average of $635). 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 PHL to OPO?

Find hourly flight availability from Philadelphia 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 October 23, 2025.

One of the essential ways to save on airfare from Philadelphia to Porto is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 12% on airfare.

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 October 23, 2025.
See what other customers who have flown with United Airlines, American Airlines, and Air Canada from Philadelphia to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,995 reviews

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
United Airlines
7.4
Good
8,995 reviews
United Airlines
7.4
Good
8,995 reviews

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
American Airlines
7.2
Good
11,033 reviews
United Airlines
7.4
Good
8,995 reviews

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
Air Canada
7.1
Good
10,350 reviews
United Airlines
7.4
Good
8,995 reviews

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
Iberia
7.0
Good
2,997 reviews
United Airlines
7.4
Good
8,995 reviews

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
Lufthansa
6.8
Okay
7,518 reviews
United Airlines
7.4
Good
8,995 reviews

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Philadelphia to Porto?

    A quick flight from Philadelphia to Porto can take about 16h 08m. United Airlines provides one of the quickest options available for as low as $478. Philadelphia and Porto are separated by a distance of 3403 mi.

  • What are the cheapest airlines flying from Philadelphia to Porto round-trip?

    According to our current data, American Airlines ($567), Iberia ($593), and United Airlines ($601) offers the cheapest pricing from Philadelphia to Porto. American Airlines is currently priced 29% below the average price you’ll pay for this route.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Philadelphia to Porto (average of $383). Flying from Philadelphia to Porto in July is currently the most expensive (average of $635). 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

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See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Philadelphia to Porto

Discover the top 5 airlines that operate flights from Philadelphia 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 October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$567Average$843FlexibilityNo cancel feeOn-time71%
IberiaCheapest$593Average$877FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$601Average$832FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$636Average$869FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$673Average$702FlexibilityNo cancel feeOn-time67%

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