$246+ 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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — OPO
Nov 29 — Dec 61
1 adult, Economy
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Find cheap flights from Key Largo to Porto with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Key Largo to Porto are usually found in February or January, 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 October 30, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $441 (FlightHub) |
One-way from | $246 (Connections by easyJet) |
Popular in | December |
Cheapest in | February |
Average price | $677 |
Find flight deals from Key Largo to Porto
Cheapest flights from Key Largo to PortoExplore 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 October 30, 2025.
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 October 30, 2025.
This oojo deal was found by Cheapflights users on 10/30. 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.
Thu 12/47:55 pmMIA - OPO
1 stop16h 00mScandinavian Airlines
Mon 12/85:35 pmOPO - MIA
1 stop29h 30mScandinavian Airlines
Deal found 10/30![Scandinavian Airlines logo]()
$422
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/114:40 pmMIA - OPO
1 stop13h 30mMultiple Airlines
Sun 12/146:15 amOPO - MIA
1 stop15h 40mMultiple Airlines
Deal found 10/29![Multiple Airlines logo]()
$461
This KAYAK deal was found by Cheapflights users on 10/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/267:50 pmMIA - OPO
1 stop34h 20mSWISS
Mon 12/112:05 pmOPO - MIA
1 stop31h 35mSWISS
Deal found 10/28![SWISS logo]()
$462
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/267:50 pmMIA - OPO
1 stop34h 20mSWISS
Wed 12/312:10 pmOPO - MIA
1 stop31h 30mSWISS
Deal found 10/29![SWISS logo]()
$463
This KAYAK deal was found by Cheapflights users on 10/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:50 pmMIA - OPO
1 stop34h 20mSWISS
Tue 12/212:05 pmOPO - MIA
1 stop31h 35mSWISS
Deal found 10/28![SWISS logo]()
$470
This AirNGo deal was found by Cheapflights users on 10/30. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/911:50 pmMIA - OPO
1 stop30h 15mTAP AIR PORTUGAL
Mon 11/246:55 amOPO - MIA
1 stop12h 55mTAP AIR PORTUGAL
Deal found 10/30![TAP AIR PORTUGAL logo]()
$471
This United deal was found by Cheapflights users on 10/29. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/257:15 amMIA - OPO
1 stop21h 15mMultiple Airlines
Wed 12/312:10 pmOPO - MIA
1 stop31h 30mMultiple Airlines
Deal found 10/29![Multiple Airlines logo]()
$477
This Mytrip deal was found by Cheapflights users on 10/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/51:20 pmMIA - OPO
2 stops17h 45mMultiple Airlines
Mon 12/156:15 amOPO - MIA
1 stop15h 40mMultiple Airlines
Deal found 10/29![Multiple Airlines logo]()
$481
This United deal was found by Cheapflights users on 10/28. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/147:15 amMIA - OPO
1 stop21h 15mMultiple Airlines
Tue 11/1812:05 pmOPO - MIA
1 stop34h 25mMultiple Airlines
Deal found 10/28![Multiple Airlines logo]()
$482
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Fri 11/149:00 amMIA - OPO
2 stops19h 30mUnited Airlines
Tue 11/186:00 amOPO - MIA
2 stops34h 24mUnited Airlines
Deal found 10/28![United Airlines logo]()
$484
This United deal was found by Cheapflights users on 10/28. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:00 amMIA - OPO
2 stops21h 30mMultiple Airlines
Tue 12/212:05 pmOPO - MIA
1 stop34h 25mMultiple Airlines
Deal found 10/28![Multiple Airlines logo]()
$490
This KLM deal was found by Cheapflights users on 10/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2512:36 pmMIA - OPO
2 stops16h 54mKLM
Wed 12/311:15 amOPO - MIA
2 stops18h 31mKLM
Deal found 10/29![KLM logo]()
$492
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 October 30, 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
Mon 1/12
4:35 pm-7:00 pm
1 stop21h 25m
Porto
Sat 1/31
4:55 pm-2:50 pm
1 stop26h 55m
$441
MiamiPorto
MIA - OPO
MIAOPO
Miami
Thu 12/11
4:40 pm-11:10 am
1 stop13h 30m
Porto
Sun 12/14
6:15 am-4:55 pm
1 stop15h 40m
$461
MiamiPorto
MIA - OPO
MIAOPO
Miami
Wed 11/26
9:00 am-9:30 am
2 stops19h 30m
Porto
Mon 12/1
12:05 pm-5:30 pm
1 stop34h 25m
$482
MiamiPorto
MIA - OPO
MIAOPO
Miami
Fri 11/14
7:15 am-9:30 am
1 stop21h 15m
Porto
Tue 11/18
12:05 pm-5:30 pm
1 stop34h 25m
$482
MiamiPorto
MIA - OPO
MIAOPO
Miami
Fri 11/14
9:00 am-9:30 am
2 stops19h 30m
Porto
Tue 11/18
6:00 am-11:24 am
2 stops34h 24m
$484
MiamiPorto
MIA - OPO
MIAOPO
Miami
Thu 11/27
7:00 am-9:30 am
2 stops21h 30m
Porto
Tue 12/2
12:05 pm-5:30 pm
1 stop34h 25m
$490
MiamiPorto
MIA - OPO
MIAOPO
Miami
Tue 11/25
12:36 pm-10:30 am
2 stops16h 54m
Porto
Wed 12/3
11:15 am-12:46 am
2 stops18h 31m
$492
MiamiPorto
MIA - OPO
MIAOPO
Miami
Mon 1/12
8:00 am-12:05 pm
2 stops23h 05m
Porto
Sat 1/31
6:00 am-11:26 am
2 stops34h 26m
$492
MiamiPorto
MIA - OPO
MIAOPO
Miami
Wed 11/26
11:27 am-10:30 am
2 stops18h 03m
Porto
Wed 12/3
11:25 am-8:20 pm
1 stop13h 55m
$493
MiamiPorto
MIA - OPO
MIAOPO
Miami
Mon 1/12
4:40 pm-11:15 am
1 stop13h 35m
Porto
Sat 1/31
6:00 am-11:26 am
2 stops34h 26m
$493
Showing 1-10 of 17 results
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 October 24, 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, November is the cheapest month in which you can book a flight from Key Largo to Porto (average of $306). Flying from Key Largo to Porto in June is currently the most expensive (average of $598). 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 October 30, 2025.
A simple way to save on the total cost of your ticket is to fly from Key Largo to Porto in the morning. If you’re flexible enough to do this you can expect to save up to 34% on your trip compared to booking a flight in the afternoon.
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 evenings when fares are most often at their lowest. Sunday at noon 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 October 30, 2025.
See what other customers who have flown with United Airlines, Air Canada, and TAP AIR PORTUGAL 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.
Overall
7.4
Boarding
7.7
Comfort
7.3
Crew
8.1
Food
6.6
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreSebrena,Oct 2025
IAH - RSW
Overall
7.4
Boarding
7.7
Comfort
7.3
Crew
8.1
Food
6.6
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreSebrena,Oct 2025
IAH - RSW
Overall
7.4
Boarding
7.7
Comfort
7.3
Crew
8.1
Food
6.6
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreSebrena,Oct 2025
IAH - RSW
Overall
7.4
Boarding
7.7
Comfort
7.3
Crew
8.1
Food
6.6
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreSebrena,Oct 2025
IAH - RSW
Overall
7.4
Boarding
7.7
Comfort
7.3
Crew
8.1
Food
6.6
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreSebrena,Oct 2025
IAH - RSW
Overall
7.4
Boarding
7.7
Comfort
7.3
Crew
8.1
Food
6.6
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreSebrena,Oct 2025
IAH - RSW
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.
Traveling to a place near Porto?
Book flights to Porto if you plan to visit one of these locationsAveiro
Arcos de Valdevez
Coimbra
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Alternative routes for Key Largo to Porto
See prices for flight routes from nearby airports that may be better suited for you.
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 October 30, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$476 | Average$729 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$477 | Average$761 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$492 | Average$708 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$494 | Average$585 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$500 | Average$607 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$518 | Average$743 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$521 | Average$693 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$525 | Average$691 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$532 | Average$730 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$550 | Average$745 | FlexibilityNo cancel fee | On-time76% |