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$222+ 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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — OPO
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
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 julio 31, 2025.

Round-trip from

$585
(Gurufare)

One-way from

$222
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$760
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, 1% potential price rise
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Cheapest flight prices on average. 4% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in July 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 julio 31, 2025.

This Gurufare deal was found by Cheapflights users on 7/30. 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. 9/257:35 pmMIA - OPO
1 stop33h 15mBritish Airways
vie. 10/311:15 amOPO - MIA
2 stops17h 02mBritish Airways
Deal found 7/30$585
This Mytrip deal was found by Cheapflights users on 7/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/117:55 amMIA - OPO
2 stops26h 10mMultiple Airlines
mié. 8/277:15 amOPO - MIA
3 stops34h 56mMultiple Airlines
Deal found 7/28$586
This United Airlines deal was found by Cheapflights users on 7/28. 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. 9/92:55 pmMIA - OPO
2 stops37h 25mUnited Airlines
mar. 9/1612:50 pmOPO - MIA
2 stops35h 21mUnited Airlines
Deal found 7/28$591
This oojo deal was found by Cheapflights users on 7/30. 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.
mar. 9/239:30 pmMIA - OPO
1 stop12h 45mAir Europa
jue. 10/27:35 amOPO - MIA
1 stop16h 10mAir Europa
Deal found 7/30$592
This American Airlines deal was found by Cheapflights users on 7/31. 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.
lun. 8/1810:10 amMIA - OPO
2 stops16h 25mAmerican Airlines
dom. 8/248:15 amOPO - MIA
2 stops18h 35mAmerican Airlines
Deal found 7/31$600
This Priceline deal was found by Cheapflights users on 7/31. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/1011:50 amMIA - OPO
2 stops16h 30mAir Canada
mié. 9/176:15 amOPO - MIA
2 stops36h 05mAir Canada
Deal found 7/31$604
This KAYAK deal was found by Cheapflights users on 7/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/22:55 pmMIA - OPO
1 stop11h 50mLufthansa
mar. 9/236:00 amOPO - MIA
1 stop13h 40mLufthansa
Deal found 7/29$606
This Gotogate deal was found by Cheapflights users on 7/30. 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.
vie. 9/264:35 pmMIA - OPO
1 stop22h 50mTAP AIR PORTUGAL
vie. 10/310:00 amOPO - MIA
1 stop16h 45mTAP AIR PORTUGAL
Deal found 7/30$632
This Delta deal was found by Cheapflights users on 7/30. 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.
lun. 8/1110:50 pmMIA - OPO
1 stop28h 35mDelta
mié. 8/276:15 amOPO - MIA
2 stops20h 15mDelta
Deal found 7/30$635

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 julio 31, 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

jue. 9/25

7:35 pm-9:50 am

1 stop33h 15m

Porto

vie. 10/3

11:15 am-11:17 pm

2 stops17h 02m

$585

MiamiPorto

MIA - OPO

MIAOPO

Miami

lun. 8/11

7:55 am-3:05 pm

2 stops26h 10m

Porto

mié. 8/27

7:15 am-1:11 pm

3 stops34h 56m

$586

MiamiPorto

MIA - OPO

MIAOPO

Miami

mar. 9/9

2:55 pm-9:20 am

2 stops37h 25m

Porto

mar. 9/16

12:50 pm-7:11 pm

2 stops35h 21m

$591

MiamiPorto

MIA - OPO

MIAOPO

Miami

mar. 9/23

9:30 pm-3:15 pm

1 stop12h 45m

Porto

jue. 10/2

7:35 am-6:45 pm

1 stop16h 10m

$592

MiamiPorto

MIA - OPO

MIAOPO

Miami

lun. 8/18

10:10 am-7:35 am

2 stops16h 25m

Porto

dom. 8/24

8:15 am-9:50 pm

2 stops18h 35m

$600

MiamiPorto

MIA - OPO

MIAOPO

Miami

mié. 9/10

11:50 am-9:20 am

2 stops16h 30m

Porto

mié. 9/17

6:15 am-1:20 pm

2 stops36h 05m

$604

MiamiPorto

MIA - OPO

MIAOPO

Miami

mar. 9/2

2:55 pm-7:45 am

1 stop11h 50m

Porto

mar. 9/23

6:00 am-2:40 pm

1 stop13h 40m

$606

MiamiPorto

MIA - OPO

MIAOPO

Miami

vie. 9/26

4:35 pm-8:25 pm

1 stop22h 50m

Porto

vie. 10/3

10:00 am-9:45 pm

1 stop16h 45m

$632

MiamiPorto

MIA - OPO

MIAOPO

Miami

lun. 8/11

10:50 pm-8:25 am

1 stop28h 35m

Porto

mié. 8/27

6:15 am-9:30 pm

2 stops20h 15m

$635

MiamiPorto

MIA - OPO

MIAOPO

Miami

dom. 8/10

12:35 am-3:05 pm

2 stops33h 30m

$222

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 19 results
1
2

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 July 25, 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 $1,033). 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 julio 31, 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.

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 julio 31, 2025.
See what other customers who have flown with Delta, KLM, and United Airlines from Key Largo 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.
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

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
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

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
1,383 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

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
8,900 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

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.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

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 Canada
7.1
Good
9,851 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

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 $256. However, be on the lookout for offers from British Airways and Iberia, 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 $1,033). 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
Coimbra

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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 julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$377Average$523FlexibilityNo cancel feeOn-time79%
Air EuropaCheapest$464Average$722FlexibilityNo cancel feeOn-time83%
TAP AIR PORTUGALCheapest$466Average$747FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$494Average$679FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$503Average$700FlexibilityNo cancel feeOn-time71%
IberiaCheapest$503Average$686FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$527Average$693FlexibilityNo cancel feeOn-time70%
Air CanadaCheapest$553Average$718FlexibilityNo cancel feeOn-time67%
DeltaCheapest$565Average$703FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$567Average$757FlexibilityNo cancel feeOn-time69%

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