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$910+ Cheap flights from Greenville (GSP) to Porto (OPO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — OPO
Jun 6 — Jun 131
Sat 6/6
Sat 6/13
1 adult, Economy
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Cheap flight deals from Greenville to Porto

Cheapest flights from Greenville to Porto
Explore the most affordable flight options available from Greenville to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 7, 2026.

This United Airlines deal was found by Cheapflights users on 5/3. 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 9/246:55 pm
GSP
-
OPO
2 stops31h 15m
United Airlines
Fri 10/26:00 am
OPO
-
GSP
2 stops44h 11m
United Airlines
Deal found 5/3$910
This Delta deal was found by Cheapflights users on 5/4. 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.
Tue 9/225:05 pm
GSP
-
OPO
2 stops17h 20m
Delta
Sat 9/266:10 am
OPO
-
GSP
2 stops20h 15m
Delta
Deal found 5/4$913
This United Airlines deal was found by Cheapflights users on 5/3. 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 9/236:30 am
GSP
-
OPO
2 stops19h 30m
United Airlines
Fri 10/26:00 am
OPO
-
GSP
2 stops37h 24m
United Airlines
Deal found 5/3$918
This United Airlines deal was found by Cheapflights users on 5/3. 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 7/67:49 pm
GSP
-
OPO
1 stop29h 26m
United Airlines
Tue 7/2112:15 pm
OPO
-
GSP
2 stops50h 40m
United Airlines
Deal found 5/3$939
This Delta deal was found by Cheapflights users on 5/7. 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 7/68:52 am
GSP
-
OPO
2 stops18h 38m
Delta
Tue 7/216:15 am
OPO
-
GSP
2 stops22h 39m
Delta
Deal found 5/7$951
This United Airlines deal was found by Cheapflights users on 5/3. 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 9/611:25 am
GSP
-
OPO
1 stop14h 30m
United Airlines
Sun 9/1312:15 pm
OPO
-
GSP
2 stops39h 50m
United Airlines
Deal found 5/3$957

Find flight deals from Greenville to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Greenville (GSP) 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 May 7, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$910
(United Airlines)
Provider with most accurate pricing for Greenville-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Greenville-Porto flights.
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From Greenville to Porto
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Greenville 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 May 7, 2026.
Use the filters below to find and compare flights from Greenville to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

Thu 9/24

6:55 pm-7:10 am

2 stops31h 15m

Porto

Fri 10/2

6:00 am-9:11 pm

2 stops44h 11m

$910
Quickest round-trip

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

Tue 9/22

5:05 pm-3:25 pm

2 stops17h 20m

Porto

Sat 9/26

6:10 am-9:25 pm

2 stops20h 15m

$913

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

Wed 9/23

8:26 pm-9:45 am

1 stop32h 19m

Porto

Fri 10/2

6:00 am-2:24 pm

2 stops37h 24m

$913

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

Mon 7/6

8:52 am-8:30 am

2 stops18h 38m

Porto

Tue 7/21

6:15 am-11:54 pm

2 stops22h 39m

$951

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

Mon 7/6

7:49 pm-6:15 am

1 stop29h 26m

Porto

Tue 7/21

12:35 pm-11:34 pm

1 stop15h 59m

$953

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

Mon 7/6

6:30 am-7:00 am

2 stops19h 30m

Porto

Mon 7/20

6:00 am-11:34 pm

2 stops22h 34m

$1,052

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

Mon 7/6

7:49 pm-6:15 am

1 stop29h 26m

Porto

Mon 7/20

9:00 am-11:34 pm

1 stop19h 34m

$1,061
Cheapest one-way
Quickest one-way

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

Thu 9/10

10:25 am-11:25 pm

2 stops32h 00m

$1,432

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/7

Sorted by cheapest first

Compare providers for flights from Greenville 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 Greenville to Porto in May.
ProviderPrice AccuracyTrust Score*
OvagoPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust 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 Greenville-Porto flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Greenville-Porto flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Greenville-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Greenville-Porto flights, Cheapflights users trust Ovago the most. Ovago 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 Greenville-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 Greenville to Porto

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

Related info for your journey

Find useful and relevant information for your journey from Greenville 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 Greenville to Porto?

    There are many flights that can get you from Greenville to Porto in 17h 20m. Fly via United Airlines or Delta to get the fastest option. The distance between Greenville and Porto is about 3901 mi. This flight may include one or multiple stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Greenville 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.

See more FAQs

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

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