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$252+ 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 4/7. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — OPO
Apr 7 — Apr 141
Mon 4/7
Mon 4/14
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Porto are usually found in February or January, booked 14 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 April 2, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$538
(FlightHub)

One-way from

$252
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$662
Provider with most accurate pricing for Miami-Porto flight deals.
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Provider most trusted by Cheapflights users for Miami-Porto flights.
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From Key Largo to Porto
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One-way flight from Key Largo to Porto
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Highest demand for flights based on searches. 21% potential increase in price ($196 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 2, 2025.

This United deal was found by Cheapflights users on 3/31. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:40 amMIA - OPO
2 stops24h 00mMultiple Airlines
Wed 11/197:30 pmOPO - MIA
1 stop27h 00mMultiple Airlines
Deal found 3/31$533
This FlightHub deal was found by Cheapflights users on 4/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/234:30 pmMIA - OPO
1 stop11h 30mTAP AIR PORTUGAL
Thu 10/210:25 pmOPO - MIA
1 stop21h 25mTAP AIR PORTUGAL
Deal found 4/1$538
This SWISS deal was found by Cheapflights users on 4/1. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/127:50 pmMIA - OPO
1 stop17h 50mSWISS
Wed 11/192:10 pmOPO - MIA
2 stops29h 30mSWISS
Deal found 4/1$539
This Priceline deal was found by Cheapflights users on 3/31. 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.
Wed 10/2212:00 pmMIA - OPO
2 stops14h 35mIberia
Wed 10/298:20 amOPO - MIA
2 stops17h 30mIberia
Deal found 3/31$541
This American Airlines deal was found by Cheapflights users on 4/1. 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.
Wed 10/2212:00 pmMIA - OPO
2 stops14h 35mAmerican Airlines
Wed 10/298:20 amOPO - MIA
2 stops17h 30mAmerican Airlines
Deal found 4/1$556
This Gotogate deal was found by Cheapflights users on 4/1. 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.
Mon 4/79:30 pmMIA - OPO
1 stop12h 45mAir Europa
Wed 4/2311:35 amOPO - MIA
1 stop12h 10mAir Europa
Deal found 4/1$568
This KLM deal was found by Cheapflights users on 4/2. 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.
Wed 4/24:35 pmMIA - OPO
1 stop17h 55mKLM
Tue 4/86:20 amOPO - MIA
2 stops19h 12mKLM
Deal found 4/2$572
This Delta deal was found by Cheapflights users on 4/2. 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.
Wed 4/212:00 pmMIA - OPO
2 stops22h 30mDelta
Tue 4/86:20 amOPO - MIA
2 stops19h 12mDelta
Deal found 4/2$577
This United deal was found by Cheapflights users on 4/2. 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.
Wed 4/25:20 pmMIA - OPO
1 stop11h 25mUnited Airlines
Tue 4/86:00 amOPO - MIA
1 stop13h 40mUnited Airlines
Deal found 4/2$600
This Air Canada deal was found by Cheapflights users on 4/2. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/92:15 pmMIA - OPO
1 stop14h 20mAir Canada
Thu 8/2112:10 pmOPO - MIA
1 stop16h 06mAir Canada
Deal found 4/2$604
This Gurufare deal was found by Cheapflights users on 4/2. 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.
Sat 9/610:30 pmMIA - OPO
2 stops40h 55mBritish Airways
Wed 9/178:15 amOPO - MIA
1 stop11h 50mBritish Airways
Deal found 4/2$648
This Aeromexico deal was found by Cheapflights users on 4/1. 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 Aeromexico is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2411:35 amMIA - OPO
2 stops22h 55mAir France
Fri 10/39:20 amOPO - MIA
2 stops42h 53mAir France
Deal found 4/1$672

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 April 2, 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

Tue 9/23

4:30 pm-9:00 am

1 stop11h 30m

Porto

Thu 10/2

10:25 pm-2:50 pm

1 stop21h 25m

$538

MiamiPorto

MIA - OPO

MIAOPO

Miami

Wed 4/30

5:15 pm-10:10 pm

2 stops23h 55m

Porto

Wed 5/7

5:45 pm-2:20 pm

1 stop25h 35m

$550

MiamiPorto

MIA - OPO

MIAOPO

Miami

Sun 9/21

9:45 pm-9:20 pm

1 stop18h 35m

Porto

Wed 10/1

8:15 am-9:50 pm

2 stops18h 35m

$561

MiamiPorto

MIA - OPO

MIAOPO

Miami

Tue 8/5

4:35 pm-3:30 pm

1 stop17h 55m

Porto

Thu 8/21

9:20 am-8:50 pm

1 stop16h 30m

$568

MiamiPorto

MIA - OPO

MIAOPO

Miami

Fri 8/1

9:30 pm-7:20 pm

1 stop16h 50m

Porto

Fri 8/29

7:35 am-6:45 pm

1 stop16h 10m

$575

MiamiPorto

MIA - OPO

MIAOPO

Miami

Wed 8/13

2:15 pm-9:20 am

1 stop14h 05m

Porto

Tue 8/26

12:50 pm-12:31 pm

2 stops28h 41m

$591

MiamiPorto

MIA - OPO

MIAOPO

Miami

Fri 8/15

4:53 pm-9:35 am

2 stops35h 42m

Porto

Sun 8/24

11:20 am-3:07 pm

2 stops32h 47m

$601

MiamiPorto

MIA - OPO

MIAOPO

Miami

Wed 6/4

10:30 am-7:35 am

2 stops16h 05m

Porto

Wed 9/17

8:15 am-9:01 pm

2 stops17h 46m

$626

MiamiPorto

MIA - OPO

MIAOPO

Miami

Fri 4/18

7:32 pm-6:10 pm

2 stops17h 38m

Porto

Thu 4/24

6:30 am-8:32 pm

2 stops19h 02m

$632

MiamiPorto

MIA - OPO

MIAOPO

Miami

Wed 5/7

2:26 pm-8:25 am

2 stops36h 59m

Porto

Tue 5/13

4:20 pm-2:15 pm

1 stop26h 55m

$638

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 24 results
1
2
3

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 March 28, 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 14 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 $1,081). 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 April 2, 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 April 2, 2025.
Read through reviews of airlines operating flights from Key Largo to Porto, such as Delta, KLM and Austrian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
Delta
8.0
Very good
7,899 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
Austrian Airlines
7.6
Good
771 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
SWISS
7.5
Good
1,572 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.
Air France
7.4
Good
1,427 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Santiago,Apr 2024

MCO - ATL

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

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 12 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 $328. However, be on the lookout for offers from Air Europa and KLM, 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 $1,081). 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 April 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$377Average$606FlexibilityNo cancel feeOn-time79%
TAP AIR PORTUGALCheapest$454Average$746FlexibilityNo cancel feeOn-timeN/A
Air EuropaCheapest$469Average$768FlexibilityNo cancel feeOn-time83%
IberiaCheapest$471Average$699FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$477Average$758FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$479Average$700FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$494Average$629FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$527Average$693FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$559Average$865FlexibilityNo cancel feeOn-time69%
DeltaCheapest$570Average$810FlexibilityNo cancel feeOn-timeN/A

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