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$175+ Cheap flights from Key Largo, FL to Portugal

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 — LIS
Jan 31 — Feb 71
Sat 1/31
Sat 2/7
1 adult, Economy
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Cheap flight deals from Key Largo to Portugal

Cheapest flights from Key Largo to Portugal
Explore the most affordable flight options available from Key Largo to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 1, 2026.

This American Airlines deal was found by Cheapflights users on 12/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:25 pmMIA - LIS
1 stop14h 15mAmerican Airlines
Wed 1/146:30 amLIS - MIA
1 stop19h 15mAmerican Airlines
Deal found 12/29$487
This Delta deal was found by Cheapflights users on 12/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:40 pmMIA - LIS
1 stop13h 50mDelta
Wed 1/145:00 amLIS - MIA
2 stops20h 26mDelta
Deal found 12/29$497
This SWISS deal was found by Cheapflights users on 12/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:50 pmMIA - OPO
1 stop34h 25mSWISS
Mon 1/1912:05 pmOPO - MIA
1 stop31h 35mSWISS
Deal found 12/29$519
This SWISS deal was found by Cheapflights users on 12/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:40 pmMIA - OPO
1 stop13h 35mSWISS
Tue 1/1312:05 pmOPO - MIA
1 stop31h 35mSWISS
Deal found 12/29$530
This SWISS deal was found by Cheapflights users on 12/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:40 pmMIA - OPO
1 stop13h 35mSWISS
Sat 1/1711:55 amOPO - MIA
1 stop31h 45mSWISS
Deal found 12/29$541
This SWISS deal was found by Cheapflights users on 12/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:40 pmMIA - OPO
1 stop13h 35mSWISS
Sun 1/187:25 pmOPO - MIA
1 stop24h 15mSWISS
Deal found 12/29$542
This FlightHub deal was found by Cheapflights users on 12/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:45 pmMIA - OPO
1 stop13h 05mMultiple Airlines
Wed 1/2112:10 pmOPO - MIA
1 stop34h 20mMultiple Airlines
Deal found 12/29$547
This Delta deal was found by Cheapflights users on 12/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:40 pmMIA - OPO
1 stop30h 50mDelta
Sat 1/1711:15 amOPO - MIA
1 stop32h 35mDelta
Deal found 12/29$550
This SWISS deal was found by Cheapflights users on 12/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:40 pmMIA - OPO
1 stop13h 35mSWISS
Fri 1/1612:25 pmOPO - MIA
1 stop34h 05mSWISS
Deal found 12/29$552
This Delta deal was found by Cheapflights users on 12/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3111:41 amMIA - OPO
2 stops17h 49mDelta
Mon 1/1911:15 amOPO - MIA
1 stop32h 35mDelta
Deal found 12/29$553
This Delta deal was found by Cheapflights users on 12/30. 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.
Tue 12/304:50 pmMIA - OPO
1 stop12h 40mDelta
Tue 1/205:00 amOPO - MIA
1 stop14h 50mDelta
Deal found 12/30$555
This Delta deal was found by Cheapflights users on 12/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:40 pmMIA - OPO
1 stop30h 50mDelta
Wed 1/1411:25 amOPO - MIA
1 stop13h 55mDelta
Deal found 12/29$556

Find flight deals from Key Largo to Portugal

Keep the following information in mind while searching for Key Largo to Portugal flight deals. Data was last updated January 1, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$451
(oojo)

One-way from

$175
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$557
Provider with most accurate pricing for Miami-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-Lisbon Humberto Delgado flights.
Search Deals
From Key Largo to Portugal
Search Deals
One-way flight from Key Largo to Portugal
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($198 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Portugal 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 January 1, 2026.
Use the filters below to find and compare flights from Key Largo to Portugal that are best for you.

Fly from

Key Largo

Fly to

Portugal

Route

Depart

Return

Price

MiamiPorto

MIA - OPO

MIAOPO

Miami

Wed 2/25

4:35 pm-10:15 am

1 stop12h 40m

Porto

Mon 3/9

4:10 pm-3:50 pm

1 stop27h 40m

$462

MiamiFaro

MIA - FAO

MIAFAO

Miami

Wed 3/4

11:35 pm-11:50 pm

1 stop19h 15m

Faro

Tue 3/17

4:35 pm-3:50 pm

1 stop27h 15m

$471

MiamiLisbon

MIA - LIS

MIALIS

Miami

Mon 1/12

12:18 pm-8:10 am

2 stops14h 52m

Lisbon Humberto Delgado

Tue 1/20

6:10 am-4:55 pm

1 stop15h 45m

$482

MiamiLisbon

MIA - LIS

MIALIS

Miami

Sun 1/11

11:33 am-8:00 am

1 stop15h 27m

Lisbon Humberto Delgado

Tue 1/20

5:00 am-2:50 pm

1 stop14h 50m

$483

MiamiLisbon

MIA - LIS

MIALIS

Miami

Mon 2/9

2:32 pm-8:10 am

1 stop12h 38m

Lisbon Humberto Delgado

Tue 3/3

11:20 am-4:25 pm

2 stops34h 05m

$487

MiamiLisbon

MIA - LIS

MIALIS

Miami

Wed 2/11

8:00 pm-5:30 pm

1 stop16h 30m

Lisbon Humberto Delgado

Mon 3/9

11:25 am-3:50 pm

1 stop32h 25m

$487

MiamiLisbon

MIA - LIS

MIALIS

Miami

Sun 1/11

11:39 am-8:00 am

1 stop15h 21m

Lisbon Humberto Delgado

Thu 1/22

5:00 am-11:20 pm

2 stops23h 20m

$488

MiamiLisbon

MIA - LIS

MIALIS

Miami

Mon 2/9

1:45 pm-8:10 am

2 stops13h 25m

Lisbon Humberto Delgado

Wed 3/4

5:00 am-2:40 pm

1 stop14h 40m

$489

MiamiLisbon

MIA - LIS

MIALIS

Miami

Mon 2/9

1:45 pm-8:10 am

2 stops13h 25m

Lisbon Humberto Delgado

Tue 3/10

5:00 am-3:40 pm

1 stop14h 40m

$489

MiamiLisbon

MIA - LIS

MIALIS

Miami

Wed 2/11

6:45 pm-11:30 pm

1 stop23h 45m

Lisbon Humberto Delgado

Tue 3/3

11:20 am-4:25 pm

2 stops34h 05m

$490

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/30

Showing 1-10 of 55 results
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Best time to book a flight from Key Largo to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal 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 Portugal

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

Currently, January is the cheapest month in which you can book a flight from Key Largo to Portugal (average of $419). Flying from Key Largo to Portugal in June is currently the most expensive (average of $599). 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 PT?

Find hourly flight availability from Key Largo to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 1, 2026.

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

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. 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 Portugal. Reviews last updated January 1, 2026.
Read reviews from past customers who have flown Delta, United Airlines, and TAP AIR PORTUGAL from Key Largo to Portugal. 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
7.9
Good
8,011 reviews

Overall

7.9

Crew

8.5

Comfort

7.9

Food

7.2

Entertainment

7.8

Boarding

8.1

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
7.9
Good
8,011 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Crew

8.5

Comfort

7.9

Food

7.2

Entertainment

7.8

Boarding

8.1

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
9,126 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Crew

8.5

Comfort

7.9

Food

7.2

Entertainment

7.8

Boarding

8.1

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.
TAP AIR PORTUGAL
7.1
Good
2,102 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Crew

8.5

Comfort

7.9

Food

7.2

Entertainment

7.8

Boarding

8.1

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 Europa
7.0
Good
576 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Crew

8.5

Comfort

7.9

Food

7.2

Entertainment

7.8

Boarding

8.1

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.
British Airways
6.7
Okay
7,632 reviews
Delta
7.9
Good
8,011 reviews

Overall

7.9

Crew

8.5

Comfort

7.9

Food

7.2

Entertainment

7.8

Boarding

8.1

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 Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Key Largo to Portugal flight route?

    Within the past month, 113 users have taken a look at flights from Key Largo to Portugal.

  • How long is the flight from Key Largo to Portugal?

    There are many flights that can get you from Key Largo to Portugal in 12h 40m. Fly via TAP AIR PORTUGAL, United Airlines, or Delta to get the fastest option. Airlines will cover a distance of 4140 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    The cheapest airlines for a one-way flight from Key Largo to Portugal are Iberia ($223), SWISS ($246), and American Airlines ($251).

  • What are the most popular routes from Key Largo to Portugal?

    Most travelers choose Miami - Lisbon Humberto Delgado, Miami - Porto or Miami - Funchal Madeira when deciding on the best route from Key Largo to Portugal.

  • What are the most reliable airlines from Key Largo to Portugal?

    Before booking your flight to Portugal from Key Largo, check out the most reliable airlines to get you to your destination on time: Emirates (64%), JetBlue (61%), Etihad Airways( 57%).

  • What are the cheapest flights from Key Largo to Portugal?

    The cheapest flight price from Key Largo to Portugal is $263. On average you can expect to pay $1,455. The most popular route, (Miami - Lisbon Humberto Delgado), can usually be booked for $460.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Key Largo to Portugal (average of $419). Flying from Key Largo to Portugal in June is currently the most expensive (average of $599). 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

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Top 10 airlines flying from Key Largo to Portugal

Discover the top 10 airlines that operate flights from Key Largo to Portugal. 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 January 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$287Average$619FlexibilityNo cancel feeOn-time79%
FinnairCheapest$370Average$659FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$371Average$458FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$439Average$815FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$443Average$739FlexibilityNo cancel feeOn-time76%
Air EuropaCheapest$451Average$678FlexibilityNo cancel feeOn-time83%
IberiaCheapest$456Average$681FlexibilityNo cancel feeOn-time77%
KLMCheapest$462Average$674FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$478Average$719FlexibilityNo cancel feeOn-time70%
DeltaCheapest$492Average$763FlexibilityNo cancel feeOn-timeN/A

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