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Cheap flights from Portsmouth to Key Largo from £558

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 30/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
24 abr. — 1 may.1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Key Largo

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Key Largo
Explore the most affordable flight options available from Portsmouth to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 marzo 2026.

vie. 8/520:00
SOU
-
MIA
2 stops28h 20m
Multiple Airlines
mar. 12/521:35
MIA
-
SOU
1 stop12h 25m
Multiple Airlines
Deal found 24/3£610
mar. 5/509:05
SOU
-
MIA
2 stops19h 24m
KLM
mar. 12/511:58
MIA
-
SOU
2 stops15h 37m
KLM
Deal found 22/3£640
mié. 6/509:05
SOU
-
MIA
2 stops19h 24m
Delta
mié. 13/507:12
MIA
-
SOU
2 stops20h 23m
Delta
Deal found 22/3£655
mié. 6/509:05
SOU
-
MIA
1 stop34h 40m
KLM
mié. 13/511:37
MIA
-
SOU
2 stops15h 58m
KLM
Deal found 22/3£684
vie. 8/509:05
SOU
-
MIA
2 stops19h 19m
KLM
mar. 12/518:36
MIA
-
SOU
2 stops17h 14m
KLM
Deal found 24/3£686
vie. 1/517:20
SOU
-
MIA
1 stop26h 25m
KLM
vie. 8/507:12
MIA
-
SOU
2 stops20h 33m
KLM
Deal found 20/3£710
lun. 21/919:55
SOU
-
MIA
2 stops23h 35m
British Airways
lun. 12/1017:00
MIA
-
SOU
2 stops16h 45m
British Airways
Deal found 23/3£713
vie. 8/509:05
SOU
-
MIA
2 stops19h 19m
Delta
vie. 15/507:12
MIA
-
SOU
2 stops20h 33m
Delta
Deal found 23/3£716

Find flight deals from Portsmouth to Key Largo

Keep the following information in mind while searching for Portsmouth to Key Largo flight deals. Data was last updated 25 marzo 2026.

Round-trip from

£610

One-way from

£558

Popular in

December

Cheapest in

September

Average price

£531
8/5-12/5
  • 8/5-12/5
  • 3 total stops
  • 40h 45m total
  • Portsmouth to Key Largo
Search Deals
Aer Lingus
  • Aer Lingus
  • 30/3
  • 2 total stops
  • 33h 03m total
  • Portsmouth to Key Largo
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£12 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Key Largo 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 858,174 searches. Data last updated 25 marzo 2026.
Use the filters below to find and compare flights from Portsmouth to Key Largo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

mié. 6/5

09:05-23:29

2 stops19h 24m

Miami

mié. 13/5

07:12-08:35

2 stops20h 23m

£655

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

mié. 6/5

09:05-14:45

1 stop34h 40m

Miami

mié. 13/5

11:37-08:35

2 stops15h 58m

£684

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

vie. 1/5

17:20-14:45

1 stop26h 25m

Miami

vie. 8/5

07:12-08:45

2 stops20h 33m

£710

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

vie. 8/5

09:05-23:24

2 stops19h 19m

Miami

vie. 15/5

07:12-08:45

2 stops20h 33m

£716

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

lun. 20/4

19:55-14:35

2 stops23h 40m

Miami

lun. 11/5

17:00-14:45

2 stops16h 45m

£719
Fastest return journey

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

lun. 1/6

19:55-14:30

2 stops23h 35m

Miami

dom. 7/6

22:40-19:25

2 stops15h 45m

£758

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

vie. 1/5

20:00-21:37

2 stops30h 37m

Miami

vie. 8/5

18:55-08:35

2 stops32h 40m

£761

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

vie. 8/5

17:20-14:45

1 stop26h 25m

Miami

vie. 15/5

07:12-08:45

2 stops20h 33m

£765

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

jue. 23/4

15:15-20:20

2 stops34h 05m

Miami

lun. 27/4

22:45-08:25

2 stops28h 40m

£769
Cheapest one-way

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

lun. 30/3

20:00-00:03

2 stops33h 03m

£572

Flights are sorted by cheapest return flights first.

Deals found on 23/3

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

Best time to book a flight from Portsmouth to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from Portsmouth with our price prediction graph.
Estimated return 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 Portsmouth to Key Largo

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

Currently, September is the cheapest month in which you can book a flight from Portsmouth to Key Largo (average of £241). Flying from Portsmouth to Key Largo in January is currently the most expensive (average of £360). 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 P0R to KE9?

Find hourly flight availability from Portsmouth to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 25 marzo 2026.

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

Related info for your journey

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

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

    There are many flights that can get you from Portsmouth to Key Largo in 19h 19m. Fly via KLM, Delta, or British Airways to get the fastest option. The distance from Portsmouth to Key Largo is about 4381 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    The top 3 most reliable airlines when flying from Portsmouth to Key Largo are Malaysia Airlines (95%), KLM (86%) and Air France (86%).

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

    Looking at all options, your cheapest flight can be booked for £388. While the most popular route (Southampton Eastleigh - Miami) can be booked for £610 on average, our data indicates £1,675 when flying from Portsmouth to Key Largo.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from Portsmouth to Key Largo (average of £241). Flying from Portsmouth to Key Largo in January is currently the most expensive (average of £360). 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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Alternative routes for Portsmouth to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Portsmouth to Key Largo

Discover the top 10 airlines that operate flights from Portsmouth to Key Largo. 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 858,174 searches. Data last updated 25 marzo 2026.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£273Average£409FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
IcelandairCheapest£297Average£377FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
SWISSCheapest£300Average£437FlexibilityNo cancel feeOn-time79%
Search SWISS flights
DeltaCheapest£304Average£626FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Scandinavian AirlinesCheapest£311Average£367FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£327Average£517FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
A.P.G.Cheapest£343Average£532FlexibilityNo cancel feeOn-timeN/A
Search A.P.G. flights
LufthansaCheapest£352Average£499FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Air EuropaCheapest£355Average£471FlexibilityNo cancel feeOn-time83%
Search Air Europa flights
United AirlinesCheapest£356Average£514FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Portsmouth to Key Largo?

Cheapflights helps you search for flights from Portsmouth to Key Largo via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Key Largo?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Key Largo from Portsmouth.

Can Cheapflights find flights from Portsmouth to Key Largo with no change fees?

Certainly. Search results for flights to Key Largo from Portsmouth shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Portsmouth to Key Largo become cheaper?

Yes! Start tracking prices for Portsmouth to Key Largo flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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