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$617+ 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 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — OPO
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
1 adult, Economy
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Cheap 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 agosto 20, 2025.

Round-trip from

$617
(United Airlines)

Popular in

July

Cheapest in

March

Average price

$975
From Greenville to Porto
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($306 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($75 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find 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 agosto 20, 2025.

This United Airlines deal was found by Cheapflights users on 8/20. 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.
vie. 12/269:40 amGSP - OPO
2 stops24h 05mUnited Airlines
vie. 1/212:30 pmOPO - GSP
2 stops37h 26mUnited Airlines
Deal found 8/20$1,285
This Gurufare deal was found by Cheapflights users on 8/20. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/216:07 pmGSP - OPO
1 stop10h 38mLufthansa
mié. 8/276:00 amOPO - GSP
2 stops17h 52mLufthansa
Deal found 8/20$1,428
This United Airlines deal was found by Cheapflights users on 8/20. 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.
jue. 8/216:07 pmGSP - OPO
1 stop10h 38mUnited Airlines
mié. 8/279:35 amOPO - GSP
1 stop12h 30mUnited Airlines
Deal found 8/20$1,495

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 agosto 20, 2025.
Use the filters below to find and compare flights from Greenville to Porto that are best for you.

Fly from

Greenville

Fly to

Porto

Route

Depart

Return

Price

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

dom. 2/15

10:21 am-11:40 am

2 stops20h 19m

Porto

jue. 3/5

6:00 am-9:11 pm

2 stops20h 11m

$617

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

dom. 2/15

10:21 am-11:40 am

2 stops20h 19m

Porto

mié. 3/4

6:00 am-9:11 pm

2 stops20h 11m

$617

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

lun. 1/12

10:21 am-11:40 am

2 stops20h 19m

Porto

jue. 1/22

6:00 am-9:11 pm

2 stops20h 11m

$617

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

dom. 2/15

10:21 am-11:40 am

2 stops20h 19m

Porto

mar. 3/3

6:00 am-9:11 pm

2 stops20h 11m

$617

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

dom. 2/15

10:21 am-11:40 am

2 stops20h 19m

Porto

vie. 3/6

6:00 am-9:11 pm

2 stops20h 11m

$617

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

dom. 2/15

10:21 am-11:40 am

2 stops20h 19m

Porto

lun. 3/2

12:30 pm-4:55 pm

2 stops33h 25m

$636

GreenvillePorto

GSP - OPO

GSPOPO

Greenville

dom. 2/15

6:46 am-11:40 am

2 stops23h 54m

Porto

sáb. 3/7

6:00 am-9:11 pm

2 stops20h 11m

$667

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

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.

Cheapflights Insights

Everything you need to know about your flight from Greenville to Porto

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

Currently, January is the cheapest month in which you can book a flight from Greenville to Porto (average of $523). Flying from Greenville to Porto in June is currently the most expensive (average of $1,030). 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 GSP to OPO?

Find hourly flight availability from Greenville 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 agosto 20, 2025.

It’s optimal to fly from Greenville to Porto in the morning. By choosing this option you can save up to 45% on the cost of your flight, compared to a flight at noon.

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 agosto 20, 2025.
Read reviews from past customers who have flown Delta and United Airlines from Greenville to Porto. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,928 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 20h 19m. Fly via United Airlines to get the fastest option. The distance between Greenville and Porto is about 3901 mi.

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

    Our cheapest airline available from Greenville to Porto is Delta. Our recent data shows that you can find tickets from as low as $577 on this airline. An additional option worth looking into is United Airlines, starting at $751. Delta is priced at 38% lower than the current average price of a flight leaving 3 months from now.

  • 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.

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

    Currently, January is the cheapest month in which you can book a flight from Greenville to Porto (average of $523). Flying from Greenville to Porto in June is currently the most expensive (average of $1,030). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Greenville to Porto

Discover the top 2 airlines that operate flights from Greenville 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 agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$577Average$994FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$751Average$1,017FlexibilityNo cancel feeOn-time69%

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