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$352+ 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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — OPO
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 April, booked 42 days in advance, depart on a Sunday or Saturday and return on a Tuesday

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 September 16, 2025.

Round-trip from

$473
(lol.travel)

One-way from

$352
(Kiwi.com)

Popular in

May

Cheapest in

November

Average price

$886
From Philadelphia to Porto
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One-way flight from Philadelphia to Porto
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Highest demand for flights based on searches. 6% potential increase in price ($53 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 16, 2025.

This lol.travel 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/195:35 pmPHL - OPO
1 stop17h 05mUnited Airlines
Tue 11/46:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 9/16$473
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.
Mon 10/273:00 pmPHL - OPO
2 stops14h 30mUnited Airlines
Tue 11/46:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 9/15$478
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/194:50 pmPHL - OPO
2 stops20h 25mAir Canada
Tue 11/46:00 amOPO - PHL
2 stops21h 56mAir Canada
Deal found 9/16$481
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.
Sun 10/2610:34 amPHL - OPO
2 stops18h 56mUnited Airlines
Tue 11/46:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 9/15$484
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.
Sun 10/268:00 pmPHL - OPO
2 stops33h 30mUnited Airlines
Wed 11/512:35 pmOPO - PHL
2 stops26h 11mUnited Airlines
Deal found 9/15$487
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.
Sun 10/195:35 pmPHL - OPO
1 stop17h 05mLufthansa
Tue 11/46:00 amOPO - PHL
1 stop15h 05mLufthansa
Deal found 9/15$489
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2610:34 amPHL - OPO
2 stops18h 56mUnited Airlines
Thu 11/66:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 9/16$491
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2610:34 amPHL - OPO
2 stops18h 56mUnited Airlines
Fri 11/76:00 amOPO - PHL
2 stops32h 38mUnited Airlines
Deal found 9/16$495
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.
Mon 10/2712:40 pmPHL - OPO
2 stops16h 50mUnited Airlines
Wed 11/512:30 pmOPO - PHL
1 stop32h 35mUnited Airlines
Deal found 9/15$498
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/286:40 pmPHL - OPO
1 stop13h 00mUnited Airlines
Tue 11/46:00 amOPO - PHL
1 stop15h 05mUnited Airlines
Deal found 9/16$503

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 September 16, 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 10/28

12:22 pm-9:30 am

2 stops17h 08m

Porto

Tue 11/4

6:00 am-4:05 pm

1 stop15h 05m

$478

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 3/2

12:55 pm-9:30 am

2 stops15h 35m

Porto

Thu 3/12

6:00 am-5:05 pm

1 stop15h 05m

$482

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Tue 10/28

10:05 am-9:30 am

2 stops19h 25m

Porto

Thu 11/6

6:00 am-4:05 pm

1 stop15h 05m

$484

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 10/27

3:00 pm-9:30 am

2 stops14h 30m

Porto

Tue 11/4

6:00 am-4:05 pm

1 stop15h 05m

$485

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 3/2

12:55 pm-9:30 am

2 stops15h 35m

Porto

Thu 3/12

6:00 am-12:32 am

2 stops22h 32m

$491

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Tue 10/28

10:34 am-9:30 am

2 stops18h 56m

Porto

Tue 11/4

6:00 am-9:46 am

2 stops32h 46m

$495

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 10/27

10:34 am-9:30 am

2 stops18h 56m

Porto

Fri 11/7

6:00 am-9:38 am

2 stops32h 38m

$495

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Sun 10/26

10:34 am-9:30 am

2 stops18h 56m

Porto

Fri 11/7

6:00 am-9:38 am

2 stops32h 38m

$495

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Mon 3/2

6:10 am-9:30 am

2 stops22h 20m

Porto

Wed 3/11

12:35 pm-12:32 am

2 stops15h 57m

$498

PhiladelphiaPorto

PHL - OPO

PHLOPO

Philadelphia

Tue 3/3

10:35 am-9:30 am

2 stops17h 55m

Porto

Tue 3/10

12:35 pm-12:32 am

2 stops15h 57m

$498

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 21 results
1
2
3

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 September 12, 2025.

Booking 40 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, January is the cheapest month in which you can book a flight from Philadelphia to Porto (average of $523). Flying from Philadelphia 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 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 September 16, 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 13% on airfare.

How much does it cost to fly round-trip from Philadelphia to Porto?

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.
See what other customers who have flown with United Airlines, American Airlines, and Iberia 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
8,924 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,924 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Iberia
7.0
Good
2,924 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Lufthansa
6.8
Okay
7,407 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
British Airways
6.7
Okay
7,363 reviews
United Airlines
7.4
Good
8,924 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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 14h 30m. 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, January is the cheapest month in which you can book a flight from Philadelphia to Porto (average of $523). Flying from Philadelphia 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

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See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Philadelphia to Porto

Discover the top 6 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$567Average$843FlexibilityNo cancel feeOn-time71%
IberiaCheapest$593Average$879FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$601Average$832FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$616Average$860FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$625Average$868FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$673Average$702FlexibilityNo cancel feeOn-time67%

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