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$320+ Cheap flights from Key Largo, FL 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — OPO
juin 17 — juin 241
mar. 6/17
mar. 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Porto are usually found in January or February, booked 73 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap flight deals from Key Largo to Porto

Keep the following information in mind while searching for Key Largo to Porto flight deals. Data was last updated juin 12, 2025.

Round-trip from

$599
(Gotogate)

One-way from

$320
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$825
From Key Largo to Porto
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One-way flight from Key Largo to Porto
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High demand for flights, 6% potential price rise
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Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Key Largo to Porto

Cheapest flights from Key Largo to Porto
Explore the most affordable flight options available from Key Largo to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on juin 12, 2025.

This Air Europa deal was found by Cheapflights users on 6/11. 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 Europa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 9/249:30 pmMIA - OPO
1 stop12h 45mAir Europa
ven. 10/311:35 amOPO - MIA
1 stop12h 10mAir Europa
Deal found 6/11$591
This Iberia deal was found by Cheapflights users on 6/12. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 10/82:57 pmMIA - OPO
2 stops39h 43mIberia
mer. 10/158:35 pmOPO - MIA
1 stop23h 30mIberia
Deal found 6/12$596
This Gotogate deal was found by Cheapflights users on 6/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/282:15 pmMIA - OPO
1 stop14h 20mAir Canada
mar. 8/1212:50 pmOPO - MIA
2 stops27h 10mAir Canada
Deal found 6/10$599
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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.
ven. 11/2111:35 pmMIA - OPO
1 stop11h 20mTAP AIR PORTUGAL
mer. 11/2612:00 pmOPO - MIA
1 stop14h 50mTAP AIR PORTUGAL
Deal found 6/12$601
This United Airlines deal was found by Cheapflights users on 6/11. 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.
mar. 9/24:50 pmMIA - OPO
1 stop11h 55mUnited Airlines
mar. 9/912:50 pmOPO - MIA
2 stops31h 22mUnited Airlines
Deal found 6/11$604
This United deal was found by Cheapflights users on 6/10. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/286:22 amMIA - OPO
1 stop22h 23mMultiple Airlines
mar. 8/1212:50 pmOPO - MIA
1 stop29h 21mMultiple Airlines
Deal found 6/10$608
This British Airways deal was found by Cheapflights users on 6/11. 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.
lun. 8/45:00 pmMIA - OPO
1 stop21h 50mBritish Airways
mer. 8/208:20 pmOPO - MIA
1 stop23h 05mBritish Airways
Deal found 6/11$624
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 7/99:55 pmMIA - OPO
1 stop13h 00mAmerican Airlines
mar. 7/228:15 amOPO - MIA
2 stops16h 08mAmerican Airlines
Deal found 6/12$642
This Delta deal was found by Cheapflights users on 6/10. 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.
mer. 8/207:30 pmMIA - OPO
2 stops19h 05mDelta
mer. 9/176:15 amOPO - MIA
2 stops20h 16mDelta
Deal found 6/10$653
This oojo deal was found by Cheapflights users on 6/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/287:30 pmMIA - OPO
2 stops18h 50mITA Airways
lun. 8/1811:35 amOPO - MIA
2 stops33h 25mITA Airways
Deal found 6/10$777
This KLM deal was found by Cheapflights users on 6/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 6/165:50 pmMIA - OPO
2 stops16h 40mKLM
lun. 6/236:30 amOPO - MIA
2 stops18h 02mKLM
Deal found 6/9$800

Cheapflights Fare Finder

Customize your flight search to find flights from Key Largo 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 juin 12, 2025.
Use the filters below to find and compare flights from Key Largo to Porto that are best for you.

Fly from

Key Largo

Fly to

Porto

Route

Depart

Return

Price

MiamiPorto

MIA - OPO

MIAOPO

Miami

jeu. 8/7

9:30 pm-6:50 am

1 stop28h 20m

Porto

sam. 8/23

8:10 pm-6:45 pm

1 stop27h 35m

$592

MiamiPorto

MIA - OPO

MIAOPO

Miami

lun. 7/28

2:15 pm-9:35 am

1 stop14h 20m

Porto

mar. 8/12

12:50 pm-11:00 am

2 stops27h 10m

$599

MiamiPorto

MIA - OPO

MIAOPO

Miami

mar. 9/2

4:50 pm-9:45 am

1 stop11h 55m

Porto

mar. 9/9

12:50 pm-3:12 pm

2 stops31h 22m

$604

MiamiPorto

MIA - OPO

MIAOPO

Miami

lun. 7/28

6:22 am-9:45 am

1 stop22h 23m

Porto

mar. 8/12

12:50 pm-1:11 pm

1 stop29h 21m

$608

MiamiPorto

MIA - OPO

MIAOPO

Miami

lun. 8/4

5:00 pm-7:50 pm

1 stop21h 50m

Porto

mer. 8/20

8:20 pm-2:25 pm

1 stop23h 05m

$624

MiamiPorto

MIA - OPO

MIAOPO

Miami

mer. 7/9

9:55 pm-3:55 pm

1 stop13h 00m

Porto

mar. 7/22

8:15 am-7:23 pm

2 stops16h 08m

$642

MiamiPorto

MIA - OPO

MIAOPO

Miami

dim. 7/13

4:55 pm-7:55 pm

1 stop22h 00m

Porto

mer. 7/23

8:35 pm-8:50 pm

2 stops29h 15m

$650

MiamiPorto

MIA - OPO

MIAOPO

Miami

mer. 8/20

7:30 pm-7:35 pm

2 stops19h 05m

Porto

lun. 9/15

6:30 am-12:25 am

2 stops22h 55m

$653

MiamiPorto

MIA - OPO

MIAOPO

Miami

ven. 9/5

12:25 am-8:25 pm

1 stop15h 00m

Porto

mer. 9/17

10:00 am-9:50 pm

1 stop16h 50m

$662

MiamiPorto

MIA - OPO

MIAOPO

Miami

lun. 7/28

7:30 pm-7:20 pm

2 stops18h 50m

Porto

lun. 8/18

11:35 am-4:00 pm

2 stops33h 25m

$777

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 23 results
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2
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Best time to book a flight from Key Largo to Porto

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

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

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Porto. Price data was last updated on June 9, 2025.

The price you pay for your flight from Key Largo to Porto may vary depending on when you book. For the best chance of a lower fare, look to book 73 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from Key Largo to Porto (average of $523). Flying from Key Largo to Porto in June is currently the most expensive (average of $1,047). 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 KE9 to OPO?

Find hourly flight availability from Key Largo 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 juin 12, 2025.

When flying from Key Largo to Porto, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Key Largo to Porto?

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Porto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Key Largo to Porto flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Porto by month

Plan your trip to Porto by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

Plan your trip to Porto by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

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 juin 12, 2025.
Read through reviews of airlines operating flights from Key Largo to Porto, such as Delta, KLM and Air France. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Air France
7.5
Good
1,463 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

Related info for your journey

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

  • What airport do you fly into for flights to Porto from Key Largo?

    If you book a flight to Porto from Key Largo, you will be flying to Porto, which is the city’s only airport. Porto (OPO) is located 6.8 mi from the center of Porto. There are 0 flights from Key Largo to Porto per day from 11 different airlines.

  • What are the cheapest airlines to fly from Key Largo to Porto one-way?

    The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as $333. However, be on the lookout for offers from Air Europa and United Airlines, as they are both options that can get you from Key Largo to Porto for a low price.

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

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

  • How can I find direct flights from Key Largo to Porto?

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

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

    Yes. Cheapflights offers flight deals from Key Largo 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 Key Largo to Porto?

    Currently, January is the cheapest month in which you can book a flight from Key Largo to Porto (average of $523). Flying from Key Largo to Porto in June is currently the most expensive (average of $1,047). 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 Key Largo?

Book flights to Key Largo if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos
Arcos de Valdevez

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Top 10 airlines flying from Key Largo to Porto

Discover the top 10 airlines that operate flights from Key Largo 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 juin 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$377Average$531FlexibilityNo cancel feeOn-time79%
TAP AIR PORTUGALCheapest$455Average$712FlexibilityNo cancel feeOn-timeN/A
Air EuropaCheapest$469Average$746FlexibilityNo cancel feeOn-time83%
Air CanadaCheapest$477Average$932FlexibilityNo cancel feeOn-time67%
LufthansaCheapest$494Average$745FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$503Average$700FlexibilityNo cancel feeOn-time71%
IberiaCheapest$503Average$688FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$527Average$693FlexibilityNo cancel feeOn-time70%
KLMCheapest$571Average$657FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$574Average$822FlexibilityNo cancel feeOn-time69%

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